Red Hat Linux Security Advisories & Vulnerabilities
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Latest Red Hat advisories
Medium [CVE-2026-53432] Denial of Service via Integer Overflow in FuzzyMatchV2 function
fzf is vulnerable to Integer Overflow leading to crash in FuzzyMatchV2 function. When input line length is approximately 2,200,000 bytes and pattern length is 999 bytes, the product overflows. The Go runtime detects the invalid slice bounds and terminates the process immediately with a non-recoverable panic. This issue was fixed in version 0.73.1. A flaw was found in fzf. An integer overflow vulnerability exists in the FuzzyMatchV2 function when processing exceptionally long input lines and patterns. This can lead to the application terminating unexpectedly with a non-recoverable panic, resulting in a Denial of Service (DoS). A local user could exploit this by providing specially crafted input. An integer overflow in the FuzzyMatchV2 function can cause a non-recoverable Go runtime panic when processing a specially crafted input of approximately 2.2 million bytes with a 999-byte pattern. Exploitation requires local access and user interaction — an attacker must supply the crafted input to a running fzf process. Red Hat severity: Moderate — CVSS 5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-190.
Medium [CVE-2026-4629] privilege escalation through hardcoded role mapper injection
A flaw was found in Keycloak. A highly privileged user with `manage-clients` permission can exploit this vulnerability by injecting a hardcoded role mapper into any client. This action allows the user to bypass existing scope restrictions and inject the `realm-admin` role into generated tokens, resulting in privilege escalation and full administrative access to the realm. Affected product named by the advisory: Red Hat build of Keycloak 26.4.
Medium [CVE-2026-12388] Privilege escalation to realm administrator via improper authorization in identity provider mapper
A flaw was found in the Identity Provider (IdP) mapper component of Keycloak, which is used to manage how user information from external services is mapped to Keycloak users. An administrator with limited permissions to manage identity providers can exploit this flaw by creating a "Hardcoded Role" mapper that assigns high-level administrative roles (like realm-admin) to themselves or others. This allows a restricted administrator to bypass security checks and gain full control over the entire realm. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires the attacker to already possess high-level administrative privileges (manage-identity-providers). Successful exploitation allows an attacker to escalate their privileges to realm-admin, granting them full control over the Keycloak realm. The vulnerability's root cause is a failure to enforce proper authorization checks (specifically requireMapRole) within the Identity Provider mapper endpoint. Weakness: CWE-266. Affected Red Hat products: Red Hat Build of Keycloak. Red Hat does not currently list a fixing RHSA for this CVE.
Medium [CVE-2026-14209] keycloak-admin-ui:Admin UI extension brute-force-user endpoint bypasses FGAPv2 user view restrictions
A vulnerability was discovered in Keycloak's Admin UI extension that allows certain administrative users to bypass security restrictions. When Fine-Grained Admin Permissions (FGAPv2) are enabled, an administrator who should only be able to search for users (but not view their full details) can use a specific "brute-force-user" endpoint to access a user's full profile. This includes sensitive information and security metadata. The issue occurs because the system fails to check if the administrator has the required "view" permission for that specific user when using this particular search path. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that it requires the attacker to already possess administrative privileges (query-users role) and knowledge of the target user's ID. Successful exploitation allows an attacker to bypass fine-grained authorization controls to view sensitive user data they are not authorized to see. The vulnerability's root cause is a missing authorization check in the BruteForceUsersResource component of the Admin UI extension. Weakness: CWE-639. Affected Red Hat products: Red Hat build of Keycloak 26.4; Red Hat build of Keycloak 26.4.14; Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.5; Red Hat JBoss Enterprise Application Platform Expansion Pack.
Medium [CVE-2026-53917] Denial of Service via crafted OpenWire Message
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker. An authenticated user can cause a broker DoS by sending a crafted OpenWire Message with a large encoded size value for the map. OpenWire message property maps are unmarshaled without size validation which can trigger OOM and crash the broker. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue. This lack of size validation during unmarshaling can lead to an out-of-memory error, causing the broker to crash and resulting in a Denial of Service (DoS). Red Hat products ship Apache ActiveMQ Classic components as transitive dependencies. The vulnerability is in the OpenWire message property map unmarshalling code in activemq-client, which does not validate encoded size values, allowing an authenticated attacker to trigger OOM. While AMQ Broker (Artemis) delegates OpenWire deserialization to Classic's activemq-client code, this attack requires authentication and has only moderate availability impact. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770. Affected products named by the advisory: Red Hat AMQ Broker 7; Red Hat AMQ Clients; Red Hat build of Apache Camel for Spring Boot 4; Red Hat Data Grid 8; and 6 more.
Medium [CVE-2026-12610] Sssd: use-after-free crash in sssd' 'sssd_pam' process
A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit. Red Hat severity: Moderate — CVSS 6.4 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-825. 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; Red Hat OpenShift Container Platform 4. Red Hat lists Red Hat Hardened Images as not affected. 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: pam; Red Hat package: sssd.
Medium [CVE-2026-14101] Insufficient policy enforcement in Sandbox
Insufficient policy enforcement in Sandbox in Google Chrome on Mac prior to 150.0.7871.47 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Low) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Weakness: CWE-653.
Low [CVE-2026-56377] ImageMagick - Policy Bypass via Incorrect Path Validation
ImageMagick before 7.1.2-24 contains an incorrect policy check that allows attackers to create or truncate files disallowed by security policies. Remote attackers can bypass path policy restrictions in sandboxed conversion services to write arbitrary files outside intended boundaries. By circumventing these controls, an attacker can create or truncate files outside permitted security boundaries, leading to unauthorized file manipulation. This could lead to the creation or truncation of files outside of intended boundaries, potentially affecting data integrity in specific configurations where ImageMagick processes untrusted input in a sandboxed environment. Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-22. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. 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: imagemagick.
Low [CVE-2026-56369] Information disclosure due to AES-CTR nonce reuse
ImageMagick before 7.1.2-22 contains an information disclosure vulnerability in the PasskeyEncipherImage method due to AES-CTR nonce reuse. Attackers can exploit nonce reuse in the cipher implementation to recover plaintext information from encrypted images. A vulnerability has been identified in ImageMagick, a software tool used to create, edit, and convert image files. This flaw allows a remote attacker to potentially decrypt and view images that were supposed to be securely encrypted by the software, leading to an unauthorized disclosure of sensitive data. Exploitation requires an attacker to specifically target encrypted images processed by this method, which is not a common default configuration in Red Hat environments. The vulnerability primarily affects applications utilizing the `PasskeyEncipherImage` function, potentially through bindings like Magick.NET. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-323. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. 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: imagemagick.
Low [CVE-2026-56365] Magick.NET-Q8-AnyCPU: Magick.NET-Q8-OpenMP-arm6…
ImageMagick before 7.1.2-19 contains a memory leak vulnerability in the PNG encoder when writing MNG images. Attackers can trigger the encoder failure condition to exhaust memory resources and cause denial of service. A flaw was found in ImageMagick. This issue is categorized as a memory leak (CWE-401). While the flaw can exhaust system memory, it requires an application to process a specially crafted MNG image, limiting the attack surface in typical Red Hat deployments. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-401. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. 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: imagemagick.
Low [CVE-2026-56364] Magick.NET-Q16-HDRI-arm64: Magick.NET-Q16-HDRI-…
ImageMagick before 7.1.2-13 contains a memory leak vulnerability in LoadOpenCLDeviceBenchmark() function when parsing malformed OpenCL device profile XML files with unclosed device elements. Attackers with write access to the OpenCL cache directory can place malicious XML files to exhaust memory and cause denial of service. A Denial of Service (DoS) vulnerability exists in ImageMagick. An attacker with write access to the OpenCL cache directory can exhaust system memory and crash the application by placing a maliciously crafted file. This vulnerability in ImageMagick is of Low impact. Under these conditions, a specially crafted XML file can cause a memory leak, leading to resource exhaustion and a denial of service over extended periods. Red Hat severity: Low — CVSS 1.9 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-401. Under investigation: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Low [CVE-2026-56363] ImageMagick - Division by Zero in Binomial Kernel Processing
ImageMagick before 7.1.2-22 contains a division by zero vulnerability in binomial kernel processing that allows attackers to cause denial of service. An attacker can supply a large binomial kernel value causing integer overflow, resulting in division by zero and application crash. An attacker can crash the application and cause service unavailability by submitting a maliciously crafted image. This flaw in ImageMagick is rated as Low impact. An attacker can trigger a denial of service by providing a specially crafted image that, when processed, causes an integer overflow and subsequent division by zero. This issue requires user interaction, as the vulnerable ImageMagick instance must process the malicious input. Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L). Weakness: CWE-190. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. 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: imagemagick.
Low [CVE-2026-56361] Heap buffer overflow via incorrect morphology parameters
ImageMagick before 7.1.2-19 contains an off-by-one error in morphology validation allowing out-of-bounds heap buffer reads. Attackers can trigger heap buffer overflow by providing incorrect morphology parameters causing single pixel memory access violations. A flaw was found in ImageMagick. An attacker can exploit an off-by-one error in the morphology validation by providing incorrect morphology parameters. This can lead to out-of-bounds heap buffer reads and heap buffer overflow, potentially causing memory access violations. This flaw in ImageMagick is rated as Low impact. An attacker can trigger a memory access violation by submitting a maliciously crafted image. Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L). Weakness: CWE-125. Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. 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: imagemagick.
Low [CVE-2026-58371] Information disclosure via unvalidated JSONP callback parameter
SeaweedFS before 4.30 reflects the callback query parameter verbatim into responses served with Content-Type application/javascript in the shared writeJson helper (weed/server/common.go), with no callback-name validation, no X-Content-Type-Options: nosniff header, and no CORS allow-list. Every JSON endpoint that uses writeJson - including the unauthenticated master endpoints /dir/status, /dir/lookup and /cluster/status, the volume server /status, and the filer directory listing, all reachable in the default configuration (no -whiteList, no security.toml, bound to 0.0.0.0) - can therefore be loaded cross-origin via a script tag with a chosen callback, letting a third-party web page read cluster topology, volume server URLs and gRPC ports, file identifiers, and directory listings. Because the callback string is reflected at the start of the body and no nosniff header is sent, MIME-sniffing clients may also interpret the reflected content as HTML. A flaw was found in SeaweedFS. This vulnerability allows a remote attacker to disclose sensitive information by exploiting an unvalidated JSONP (JavaScript Object Notation with Padding) callback parameter. The system reflects the callback parameter directly into responses without proper validation or security headers, enabling cross-origin loading of JSON endpoints. Affected product named by the advisory: Cryostat 4.
Low [CVE-2026-37106] Unauthorized account creation via registration function
An issue in DokuWiki 2025-05-14b "Librarian" 56.2 allows a remote attacker to create an account via the register function in inc/auth.php. NOTE: this is disputed by the Supplier because this is the intentional behavior when the product is configured for self-registration (a non-default feature). The supplier also notes that there is no configuration migration scenario that would result in the self-registration being enabled without the administrators knowledge. A flaw was found in DokuWiki. This occurs when the DokuWiki instance is configured to allow self-registration, which is not the default setting. This could lead to the creation of unauthorized user accounts. An attacker could create unauthorized user accounts if this non-default feature is enabled. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-306.
High [CVE-2026-55607] @anthropic-ai/claude-code: Claude Code: Arbitrary code execution through git directory confusion
Claude Code is an agentic coding tool. From 2.1.38 until 2.1.163, Claude Code's worktree handling allowed creation of worktrees named ".git" and navigation to worktrees outside the sandbox context, enabling git directory confusion attacks. By exploiting symlink manipulation and git fsmonitor execution during worktree operations, an attacker could overwrite files in the user's home directory (such as.zshenv), leading to code execution outside of seatbelt sandbox restrictions. Reliably exploiting this required the user to clone a malicious repository containing prompt injection content and run Claude Code against it. This vulnerability is fixed in 2.1.163. This vulnerability allowed the creation of specially named worktrees and navigation outside of the intended secure environment, leading to what is known as a 'git directory confusion attack'. By manipulating symbolic links and how git monitors file system changes, an attacker could overwrite important user files, potentially leading to unauthorized code execution on the user's system. This attack requires a user to interact with a malicious code repository. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-59. Affected Red Hat products: OpenShift Lightspeed. Red Hat does not currently list a fixing RHSA for this CVE.
High [CVE-2026-13676] Security policy bypass due to improper Unicode hostname canonicalization
fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks. A remote attacker could exploit this to circumvent security controls and potentially access unauthorized resources or perform malicious redirects. This Important flaw in `fast-uri` allows a remote attacker to bypass host-based security policies. Applications that rely on `fast-uri` for URL parsing and policy enforcement, such as denylists or redirect validations, can be circumvented due to inconsistent handling of Unicode hostnames.
High [CVE-2026-54369] Symlink traversal privilege escalation via libacl functions
acl before version 2.4.0 contains a symlink traversal vulnerability in the libacl pathname-based functions acl_get_file(), acl_set_file(), acl_extended_file(), and acl_delete_def_file() that allows local attackers to escalate privileges by replacing any pathname component with a symbolic link. Attackers who control any component of a pathname processed by a privileged caller can redirect ACL read or write operations to arbitrary files or directories, enabling unauthorized manipulation of access control lists and local privilege escalation. A flaw was found in the `acl` package, specifically within its `libacl` pathname-based functions. Exploitation requires local access with the ability to create symlinks in a directory that a privileged program later processes with acl_get_file() or acl_set_file(). In default RHEL and OpenShift CoreOS configurations, standard file permission settings limit where unprivileged users can create symlinks, reducing the practical attack surface. Programs that operate on user-supplied paths with elevated privileges are most at risk. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). Weakness: CWE-59.
High [CVE-2026-12856] Command Injection vulnerability in the JavaDoc hover provider of the vscode-java extension
A flaw was found in the vscode-java extension, which provides Java language support for Visual Studio Code. The extension incorrectly trusts all Markdown content in JavaDoc hovers, allowing a malicious Java file to include hidden commands. If a user clicks a specially crafted link within a JavaDoc hover popup, an attacker can execute arbitrary VS Code commands, which can lead to full system compromise in trusted workspaces. The Red Hat Product Security team has assessed the severity of this vulnerability as Important, given that it requires a user to open a malicious Java source file and interact with a hover popup. Successful exploitation allows an attacker to execute arbitrary commands within the context of the VS Code editor and potentially the underlying operating system. The vulnerability's root cause is the over-trusting of Markdown content returned by the Java language server, which fails to isolate extension-generated trusted links from attacker-controlled JavaDoc content. Weakness: CWE-88. Affected Red Hat products: Red Hat OpenShift Dev Spaces 3.29. Red Hat fixing advisory: RHSA-2026:36820.
Medium [CVE-2026-55956] Improper Authorization Allows Security Constraint Bypass
Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue. A flaw was found in Apache Tomcat where access control rules for the default servlet are improperly handled. An attacker can exploit this issue to bypass specific HTTP method restrictions, potentially gaining unauthorized access to protected application resources. Red Hat products utilizing affected Tomcat versions are vulnerable if they rely on these method-specific security constraints. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-551. Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; and 17 more.
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