Red Hat Linux Security Advisories & CVEs
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Latest Red Hat advisories
Medium [CVE-2026-16104] Authenticator config endpoint exposes raw reCAPTCHA secrets to view-only admins
A flaw was found in the authentication configuration endpoint of the keycloak-services component, which is the core engine for Red Hat Build of Keycloak identity and access management. The issue occurs because the system fails to mask sensitive configuration values, such as reCAPTCHA secret keys, when they are requested by administrators with view-only permissions. This can lead to the exposure of third-party service credentials to unauthorized personnel or through administrative logs. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires the attacker to have authenticated administrative access with at least view-realm permissions. Successful exploitation allows an attacker to retrieve raw reCAPTCHA secrets and view them in administrative event logs. The vulnerability's root cause is the improper handling of sensitive configuration fields during the conversion of internal models to their API representations. Weakness: CWE-212. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7. Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat fixing advisory: RHSA-2026:68277, RHSA-2026:68278.
Medium [CVE-2026-16103 +1] Incomplete fix for CIBA brute-force lockout bypass at token redemption
A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that successful exploitation allows an attacker to obtain a valid user session for an account that should be temporarily disabled by brute-force protection. Successful exploitation requires a CIBA request to be in flight prior to the account lockout and necessitates user interaction for approval. The vulnerability's root cause is the omission of brute-force protector checks in the CIBA grant redemption code path. Weakness: CWE-305. Affected Red Hat products: Red Hat Build of Keycloak. Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-16106] Incorrect authorization in admin role-composite deletion allows delegated admin to remove privileged child roles
A flaw was found in the admin REST API of Keycloak, a solution for identity and access management. The issue occurs when a delegated administrator attempts to remove a child role from a composite role. Due to missing authorization checks, an attacker with limited administrative permissions can remove privileged roles they are not authorized to manage, leading to a loss of access for other users and administrators. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to already possess high-level delegated administrative privileges. Successful exploitation allows an attacker to remove privileged child roles from composites, leading to the unauthorized removal of administrative or functional roles from other users. The vulnerability's root cause is a missing per-child authorization check in the role-composite deletion REST API endpoints. Weakness: CWE-1220. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7. Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat fixing advisory: RHSA-2026:68277, RHSA-2026:68278.
Medium [CVE-2026-16108] Realm default-group reads disclose hidden groups under FGAP v2
A flaw was found in the default-groups REST endpoint and realm representation of Keycloak. This component is responsible for managing groups that are automatically assigned to new users within a realm. The issue allows a delegated administrator with realm-viewing permissions to see the names and identifiers of hidden default groups, even if they lack the specific permissions to view those groups. This can lead to the exposure of sensitive organizational structures or internal group names. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires the attacker to already possess delegated administrative privileges and for FGAP v2 to be enabled. Successful exploitation allows an attacker to disclose the names and identifiers of groups they are not authorized to view. Weakness: CWE-1220. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7. Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat fixing advisory: RHSA-2026:68277, RHSA-2026:68278.
Medium [CVE-2026-16093] Required signed-JWT assertion policy can be bypassed with unsigned assertion headers
Keycloak provides a mechanism called Client Policies to enforce security requirements on clients, such as requiring them to use signed JWTs for authentication. A flaw was discovered where this enforcement can be bypassed. An attacker with valid client credentials can provide a fake, unsigned assertion header that tricks the system into thinking the policy requirements have been met. This allows the attacker to authenticate using simpler methods like a client secret even when the administrator has mandated more secure, signed assertions. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that the attacker must already possess valid client credentials to perform the bypass. Successful exploitation allows an attacker to bypass mandatory signed-JWT assertion policies by providing unsigned headers. The vulnerability's root cause is insufficient validation of the client assertion parameters and authentication method within the client policy executor. Weakness: CWE-807. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7; Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7. Red Hat fixing advisory: RHSA-2026:68277, RHSA-2026:68278.
Medium [CVE-2026-16089] Authorization codes can be retargeted to another client session
A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to intercept a valid authorization code and have a registered client in the same realm. The vulnerability's root cause is the lack of binding between the authorization code and the issuing client identifier in the code payload. Weakness: CWE-472. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7. Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat fixing advisory: RHSA-2026:68277, RHSA-2026:68278.
Medium [CVE-2026-16072] Organization invitation link exposure allows unauthorized member creation
A flaw was found in the organization management component of Keycloak. A delegated administrator with permission to manage organizations can create an invitation for a non-existent email address and then retrieve the secret registration link directly through the application programming interface. By using this link, the administrator can create new user accounts and add them to the organization without having the required user management permissions or access to the invited email account. This allows an administrator to bypass security boundaries and add unauthorized members to an organization. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to already possess high-level administrative privileges (manage-organizations). Successful exploitation allows an attacker to bypass the manage-users permission boundary to create new managed user accounts and add them to an organization without mailbox verification. The vulnerability's root cause is the unintended exposure of the registration bearer link in the REST API response for pending invitations. Weakness: CWE-497. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7.
Medium [CVE-2026-15943] OIDC IdP update reuses masked client secret after token URL change
A flaw was found in the Keycloak keycloak-services component, which handles the management of identity providers. The issue occurs when a delegated administrator updates an OIDC identity provider using a masked client secret sentinel value. Due to improper validation, Keycloak reuses the existing real secret even if security-sensitive fields like the token URL have been changed, allowing an attacker to redirect and capture the secret. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires high administrative privileges to exploit. Successful exploitation allows an attacker to rebind and capture an OIDC client secret by modifying identity provider configuration fields. The vulnerability's root cause is the unconditional reuse of masked secrets during configuration updates without verifying if sensitive endpoint fields have changed. Weakness: CWE-1288. Affected Red Hat products: Red Hat Build of Keycloak. Red Hat lists Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7 as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-52584] Information disclosure via Buffer Overflow in DecodeImageAPNG function
Buffer Overflow vulnerability in libjxl v.0.11.2 and before allows a local attacker to obtain sensitive information via the DecodeImageAPNG function A flaw was found in libjxl. The flaw occurs within the `DecodeImageAPNG` function, which can lead to unauthorized disclosure of data. Red Hat ships libjxl as a bundled component within Firefox and Thunderbird. The vulnerable code path is in the APNG decoder (DecodeImageAPNG), which is part of the extras module used by command-line tools. Red Hat severity: Moderate — CVSS 5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N). Weakness: CWE-120. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: firefox; Red Hat package: thunderbird.
Medium [CVE-2026-57077] YAML::Syck: YAML::Syck: Information disclosure via out-of-bounds read
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len. In the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a "\r\n" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover. Any caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read. An out-of-bounds read vulnerability exists due to an unbounded newline scan during block-scalar lexing. A remote attacker could exploit this by providing a specially crafted YAML document, leading to potential information disclosure. This issue is an incomplete fix for a previously identified vulnerability. Moderate: An out-of-bounds read flaw in `perl-YAML-Syck` can lead to information disclosure when processing specially crafted YAML documents. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N). Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Medium [CVE-2026-57076] YAML::Syck: Heap use-after-free via anchor name reuse
YAML::Syck versions before 1.47 for Perl allow a heap use-after-free via an anchor name reused as an anchors-table key in syck_hdlr_add_anchor. In the bundled libsyck an anchor name allocated by syck_strndup is stored both as node->anchor, freed when the node is freed, and as the key in the parser's anchors table. Freeing the node frees the shared key, and a later anchor redefinition makes st_delete compare against the freed key, so st_strcmp reads freed heap memory. Anchors are a standard YAML feature and need no special flags, so this is reached on the default Load path. Any caller that runs Load or LoadFile on an untrusted document that redefines an anchor reaches the read of freed memory. An attacker could exploit a heap use-after-free vulnerability by providing a specially crafted YAML document that reuses an anchor name as an anchors-table key. This flaw causes the software to read freed heap memory, which may lead to information disclosure or denial of service. This Important heap use-after-free vulnerability in `perl-YAML-Syck` can be triggered by processing a specially crafted YAML document. The flaw, exploitable through the default YAML loading mechanism, may lead to information disclosure or a denial of service in applications handling untrusted YAML input. Red Hat severity: Moderate — CVSS 6.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H). Weakness: CWE-825.
Medium [CVE-2026-57075] YAML::Syck: YAML::Syck: Information disclosure via out-of-bounds read in base64 decoder
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec. The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any!!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any!!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path. Any caller that runs Load or LoadFile on an untrusted document containing a!!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result. An out-of-bounds read vulnerability exists in the base64 decoder, specifically in the `syck_base64dec` function. This occurs because the decoder uses a signed character to index a lookup table, allowing specially crafted `!!binary` YAML nodes with high-bit bytes to cause a read beyond the intended memory region. A remote attacker could exploit this by providing a malicious YAML document, potentially leading to information disclosure. This Moderate impact flaw in `perl-YAML-Syck` can lead to information disclosure. Exploitation requires an application to parse a specially crafted YAML file, making the impact dependent on the application's handling of untrusted input.
Medium [CVE-2026-46338] Information disclosure via crafted Markdown snippets
PyMdown Extensions is a set of extensions for the Python-Markdown markdown project. From 10.0.1 until 10.21.3, pymdownx.snippets uses a string-prefix containment check in SnippetPreprocessor.get_snippet_path() in pymdownx/snippets.py when `restrict_base_path: True`, allowing markdown snippet directives to read files from sibling paths that share the same base_path prefix, such as docs and docs_internal. This is a regression of CVE-2023-32309. This issue is fixed in version 10.21.3. A flaw was found in PyMdown Extensions, a tool used for processing Markdown documents. This vulnerability allows an attacker to potentially read sensitive files from unexpected locations on a system. By crafting a special Markdown snippet, an attacker could trick the system into accessing files outside of the intended directory, leading to unauthorized information disclosure. This issue requires user interaction, meaning a user would need to process a malicious Markdown file for the attack to succeed. Red Hat ships pymdown-extensions in several products as a bundled dependency. The vulnerability requires an attacker to control Markdown content processed by the pymdownx.snippets extension and for sibling directories with a matching path prefix to exist. Affected products named by the advisory: Red Hat Developer Hub; Red Hat OpenShift Container Platform 4; Self-service automation portal 2.
Medium [CVE-2026-15945] Group hierarchy search discloses hidden parent groups under FGAP v2
A flaw was found in the group search functionality of the Keycloak server's administrative API. When Fine-Grained Admin Permissions (FGAP) v2 is enabled, a delegated administrator can bypass access restrictions to view parent groups they are not authorized to By searching for a child group they have permission to view, the system incorrectly returns the full details of the parent group in the response, leading to the disclosure of sensitive group attributes and configuration. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires an authenticated attacker with specific delegated administrative permissions and the non-default FGAP v2 feature to be enabled. Successful exploitation allows an attacker to disclose sensitive metadata and configuration details of parent groups they are otherwise restricted from viewing. The vulnerability's root cause is a failure to apply fine-grained access control filters to parent groups during hierarchical search result construction. Weakness: CWE-639. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7; Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7. Red Hat fixing advisory: RHSA-2026:68277, RHSA-2026:68278.
Medium [CVE-2026-45695] Arbitrary code execution via unauthenticated SFTP configuration in HTTP server.
Kopia is a cross-platform backup tool for Windows, macOS, and Linux with fast incremental backups, client-side end-to-end encryption, compression, and data deduplication. Prior to 0.23.0, Kopia's HTTP server started with --without-password accepts unauthenticated requests to /api/v1/repo/exists and forwards attacker-supplied SFTP storage configuration to blob. NewStorage, where externalSSH: true and sshArguments containing -oProxyCommand= can cause exec. CommandContext("ssh") to invoke the command through OpenSSH. This issue is fixed in version 0.23.0. This allows the attacker to forward malicious SFTP storage configurations, which can lead to arbitrary code execution through OpenSSH commands. Red Hat Product Security considers this bug as Moderate as this requires active change of out of box configaration for this bug to be exploitable. There is no common use case under which Kopia HTTP server should be started without a password. The diecrepancy in CVSS scores between Red Hat and NVD comes from the differences in User Interaction, Integrity and Availability. The core bug is merely an unintended information disclosure problem if exploited correctly. There is no way to launch a denial of service or affect the integrity of the service. Therefore the bug is scored lower. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N). Weakness: CWE-78.
Medium [CVE-2026-47085] Information disclosure via URLAUTH token forgery
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH token forgery can occur via a missing mboxkey. If an attacker knew a folder name on the victim's account for which the victim had never issued an auth URL, they could forge a working URLAUTH token by computing an HMAC-SHA1 value with a predictable key, giving them read access to the mailbox. (URLAUTH is an obscure feature, meaning that the odds of any user actually being susceptible to this attack are very low. Perhaps no public clients use URLAUTH.) A remote attacker could exploit a vulnerability related to URLAUTH token forgery, caused by a missing mailbox key. The likelihood of exploitation is low due to the obscurity of the URLAUTH feature. Red Hat severity: Moderate — CVSS 4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N). Weakness: CWE-341. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: cyrus-imapd.
Medium [CVE-2026-47084] Unauthorized mailbox deletion via ACL bypass
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. The LOCALDELETE command bypassed ACL checks. An authenticated but non-admin user could invoke the admin-only LOCALDELETE IMAP command and delete mailboxes for which they had no permissions. This allowed them to delete mailboxes for which they did not have the necessary permissions, leading to unauthorized data integrity compromise. This Moderate flaw in Cyrus IMAP allows an authenticated user to bypass Access Control List (ACL) restrictions, enabling unauthorized mailbox deletion. The impact is considered Moderate as it requires prior authentication and specific command usage, limiting exploitation to existing users. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N). Weakness: CWE-266. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: cyrus-imapd.
Medium [CVE-2026-47082] ACL bypass in vacation 'fcc' feature allows unauthorized mailbox writes
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. The vacation "fcc" feature skips the destination-mailbox ACL. A user with low privileges can exploit a vulnerability in the vacation "fcc" feature. By crafting a specific Sieve script, the user can bypass access control lists and deliver vacation auto-reply messages into any mailbox, leading to unauthorized modification of mailbox content. Red Hat severity: Moderate — CVSS 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L). Weakness: CWE-279. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: cyrus-imapd.
Medium [CVE-2026-47083] Information disclosure via ESEARCH command
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an ESEARCH cross-user content oracle. By using the ESEARCH command, an authenticated IMAP user could enumerate folder names under any account they could name. Search would return UIDs of messages matching the search, creating a content oracle (without allowing arbitrary reads of the target's content). An authenticated user can exploit the ESEARCH command to discover the existence of folder names belonging to other user accounts. This vulnerability leads to information disclosure, allowing an attacker to gain unauthorized knowledge about the structure of other users' mailboxes. While it does not permit arbitrary content reads, this vulnerability could expose the structure of other users' mailboxes, potentially aiding further reconnaissance. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-201. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: cyrus-imapd.
Medium [CVE-2026-47089] Information disclosure via LISTRIGHTS
An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. LISTRIGHTS os not limited to users with admin access. An authenticated user can exploit this vulnerability by using the IMAP LISTRIGHTS command. This allows the user to learn the access permissions of any mailbox they can name, which should be restricted to administrators. This leads to unauthorized information disclosure regarding mailbox access controls. While requiring prior authentication, this bypasses intended administrative restrictions, potentially exposing sensitive access control configurations within a Red Hat deployment. The impact is limited to information disclosure and does not grant further privileges or data modification. Red Hat severity: Moderate — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-266. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat does not currently list a fixing RHSA for this CVE. Affected products named by the advisory: Red Hat package: cyrus-imapd.