Red Hat Linux Security Advisories & CVEs
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Security advisories for your Red Hat release
Pick your distribution release to see every advisory issued for it and its severity mix. Fixes ship as errata, so keep the system patched. This is the release's advisory history, not a per-package scan.
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Red Hat Enterprise Linux errata (RHSA) via the official Red Hat Security Data API — CVE severity, CVSS and affected packages. A credential-free official source.
Latest Red Hat advisories
Medium [CVE-2026-18211] secure-client-uris policy bypass via localhost-prefixed domains
A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the start of a web address rather than properly verifying the host, an attacker can bypass these security restrictions by using a specially crafted domain name. This could allow an attacker to intercept sensitive authentication codes over unencrypted connections. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires Dynamic Client Registration to be enabled and the attacker to control a specific localhost-prefixed domain. Successful exploitation allows an attacker to intercept authorization codes over cleartext HTTP by bypassing the secure-client-uris policy. The vulnerability's root cause is improper validation of the redirect URI host component in the secure-client-uris policy executor. Weakness: CWE-20. 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-2026-18208] Inactive out-of-audience token introspection leaks signed JWT claim
A flaw was found in the OIDC token introspection endpoint of the keycloak-services component. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when a confidential client, configured to receive signed JWT introspection responses, attempts to introspect a token issued for a different audience. Although the endpoint correctly identifies the token as inactive for that client, it still returns the full set of token claims within a signed JWT field. This allows an unauthorized client to bypass audience-based restrictions and access sensitive information contained in the token. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to control a confidential client within the same realm and possess a valid token issued for a different audience. Successful exploitation allows an attacker to recover sensitive token claims that should be restricted by audience-based access controls. The vulnerability's root cause is a failure to sanitize the signed JWT field in the introspection response when a token is determined to be inactive due to an audience mismatch. Weakness: CWE-862. Affected Red Hat products: Red Hat Build of Keycloak.
Medium [CVE-2026-16105] Missing per-role authorization on RoleContainerResource composite endpoints
A flaw was found in the RoleContainerResource component of Keycloak. The issue occurs because certain name-based endpoints in the admin REST API do not properly enforce authorization checks when managing composite roles. This allows a delegated administrator with manage-realm permissions to remove essential child roles from built-in admin roles, potentially disrupting administrative functions within a realm. 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 (manage-realm). Successful exploitation allows an attacker to remove child roles from built-in admin roles, leading to a loss of integrity for administrative configurations. The vulnerability's root cause is an incomplete fix for a previous issue, where authorization checks were not consistently applied to name-based REST API endpoints. Weakness: CWE-639. 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-2026-18215] Microsoft external access-token exchange bypasses configured tenant
Keycloak provides a way to let users log in using Microsoft accounts while restricting access to a specific organization (tenant). A flaw was discovered where this restriction is ignored when using the token exchange feature. This means an attacker with a valid Microsoft token from a completely different organization could gain access to the Keycloak realm, potentially accessing sensitive data or performing unauthorized actions. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to possess a valid Microsoft Graph access token from a different tenant. Successful exploitation allows an attacker to bypass configured tenant restrictions and gain unauthorized access to a Keycloak realm. The vulnerability's root cause is the lack of tenant ID verification during the external access-token exchange flow when interacting with the Microsoft Graph API. Weakness: CWE-287. 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-2026-18218] Client not-before revocation ignored when realm not-before is older but nonzero
A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older, non-zero revocation policy in place. This issue can allow previously issued tokens to remain valid for refreshing sessions and accessing user information even after an administrator has attempted to invalidate them. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires a specific pre-existing realm configuration and the possession of valid tokens issued within a specific timeframe. Successful exploitation allows an attacker to continue using revoked tokens for refresh, introspection, and UserInfo requests. The vulnerability's root cause is a logic error in the TokenManager. NotBeforeCheck function that fails to correctly enforce client-specific revocation policies when a realm-level policy is also present. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Red Hat severity: Moderate — CVSS 4.2 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N). Weakness: CWE-862.
Medium [CVE-2026-58039] Information disclosure due to improper permission enforcement
Information disclosure due to improper permission enforcement. Red Hat rates this moderate (CVSS 4.4). Weakness: CWE-73. Red Hat lists fixing advisory RHSA-2026:48273 with package nodejs26-main-26.5.1-1.5.hum1, nodejs22-main-22.23.2-2.3.hum1, nodejs24-main-24.18.1-0.1.hum1.
Low [CVE-2026-54787] Signature bypass allows acceptance of bundles signed with expired keys
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1. A flaw was found in sigstore-go, a software library used for verifying digital signatures. This vulnerability specifically affects the workflow for self-managed long-lived signing keys that do not use certificates. An attacker who possesses an expired signing key can exploit this by creating and signing software bundles that the system will incorrectly accept as valid. This bypasses the intended security checks, potentially leading to the acceptance of unauthorized or malicious software. Red Hat severity: Low — CVSS 3.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N). Weakness: CWE-347. Affected Red Hat products: Red Hat Hardened Images. Red Hat fixing advisory: RHSA-2026:44162, RHSA-2026:44451, RHSA-2026:47889, RHSA-2026:47891.
Low [CVE-2026-18569] OIDC backchannel logout accepts unsigned forged logout tokens
A flaw was found in the backchannel logout endpoint of the keycloak-services component, which is part of the Red Hat Build of Keycloak. This component handles authentication and session management for applications. The issue occurs when an OIDC identity provider is configured to skip signature validation. In this specific setup, the system incorrectly accepts logout requests that have no cryptographic signature. An attacker who knows certain technical details about a user's session can use this flaw to force that user to be logged out, potentially disrupting their work. The Red Hat Product Security team has assessed the severity of this vulnerability as Low, given that it requires a non-default insecure configuration and knowledge of specific session identifiers to exploit. Successful exploitation allows an attacker to force-logout targeted brokered users, leading to a limited denial of service for those individuals. The vulnerability's root cause is the failure to enforce signature validation on backchannel logout tokens when the identity provider's signature validation setting is disabled. Weakness: CWE-347. 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.
Low [CVE-2026-18209] OIDC redirect_uri fragment bypass in HTTP parameter pollution check
A flaw was found in the keycloak-services component of Keycloak, which handles OpenID Connect (OIDC) authentication flows. The issue occurs because the security check designed to prevent HTTP parameter pollution only inspects the query portion of a redirect URL and ignores the fragment portion. When a client is configured with a wildcard redirect URI, an attacker can use this to inject duplicate security parameters into the login response. If a client application is not configured correctly, it might trust the attacker's injected data instead of the real security information from Keycloak, leading to session fixation or account confusion. The Red Hat Product Security team has assessed the severity of this vulnerability as Low, given that it requires a specific client configuration and a non-conformant relying party to be successful. The vulnerability's root cause is an incomplete validation check in RedirectUtils that fails to inspect the URI fragment for forbidden parameters. Weakness: CWE-1288. 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.
Low [CVE-2026-18206] Client policy source-host wildcard domain matching bypass
A flaw was found in the keycloak-services component of Keycloak, which provides identity and access management services. The issue occurs when a realm administrator uses a wildcard domain (like *.example.com) to restrict which hosts can register or update clients. Due to improper validation, the system accepts any hostname that ends with the specified domain suffix, even if it is not a legitimate subdomain. An attacker who can control the reverse DNS of their connection can bypass these host-based restrictions, potentially allowing unauthorized client modifications. The Red Hat Product Security team has assessed the severity of this vulnerability as Low, given that exploitation requires a specific administrative configuration and attacker control over reverse DNS resolution. Successful exploitation allows an attacker to bypass host-based restrictions for client registration and update operations. The vulnerability's root cause is improper validation of wildcard domain matches in the keycloak-services component, which fails to enforce proper subdomain boundaries. Weakness: CWE-20. 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.
Low [CVE-2026-18217] SAML HTTP-Redirect binding response preserves query string leading to parameter pollution
A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and access management solution. The issue occurs when Keycloak handles SAML authentication requests using the HTTP-Redirect binding. If a client is configured with a wildcard redirect URL, an attacker can craft a request that includes malicious parameters. When a user authenticates, Keycloak appends its legitimate response to the attacker's parameters. This can cause some service providers to process the attacker's data instead of the real login information, potentially leading to a user being logged into the wrong account. The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires a specific client configuration (wildcard redirect URIs) and a downstream service provider that incorrectly handles duplicate HTTP parameters. Successful exploitation allows an attacker to perform login CSRF or session swapping on the affected service provider. The vulnerability's root cause is the improper handling of the query string in the SAML HTTP-Redirect binding response, which fails to strip or validate pre-existing SAML parameters. Weakness: CWE-20. Affected Red Hat products: Red Hat Build of Keycloak.
Critical [CVE-2026-18363] Account compromise via password reset token bypass
Account compromise via password reset token bypass. Red Hat rates this critical (CVSS 9.1). Weakness: CWE-640.
Critical [CVE-2026-44092] Integrity and availability loss via malicious MQTT input injection
Integrity and availability loss via malicious MQTT input injection. Red Hat rates this critical (CVSS 9.1). Weakness: CWE-94.
Critical [CVE-2026-17893] Insufficient validation of untrusted input in Updater
Insufficient validation of untrusted input in Updater in Google Chrome on Mac prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-1286.
Critical [CVE-2026-17890] Insufficient validation of untrusted input in DevTools
Insufficient validation of untrusted input in DevTools in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-1286.
Critical [CVE-2026-17848] Insufficient validation of untrusted input in Codecs
Integer overflow in Codecs in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted video file. (Chromium security severity: Medium) An insufficient validation of untrusted input flaw was found in the Codecs component of the Chromium browser. Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-190.
Critical [CVE-2026-17850] Inappropriate implementation in Permissions
Inappropriate implementation in Permissions in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: Medium) An inappropriate implementation flaw was found in the Permissions component of the Chromium browser. Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N). Weakness: CWE-346.
Critical [CVE-2026-17832] Use after free in ANGLE
Use after free in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:74084, RHSA-2026:69098. Affected products named by the advisory: Red Hat package: webkit2gtk3; Red Hat package: webkitgtk4.
Critical [CVE-2026-17811] Use after free in ANGLE
Use after free in ANGLE in Google Chrome on Windows prior to 151.0.7922.72 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium) An use after free flaw was found in the ANGLE component of the Chromium browser. Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:74084, RHSA-2026:69098. Affected products named by the advisory: Red Hat package: webkit2gtk3; Red Hat package: webkitgtk4.
Critical [CVE-2026-17806] Insufficient validation of untrusted input in Extensions
Insufficient validation of untrusted input in Extensions in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Medium) Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Moderate — CVSS 9 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H). Weakness: CWE-1289.
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