Red Hat Linux Security Advisories & Vulnerabilities
16039 advisories tracked · Red Hat Security Data API · direct feeds checked every minute; rate-limited sources checked less often
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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
High [CVE-2026-34742] Model Context Protocol (MCP) Go SDK: DNS rebinding vulnerability allows unauthorized access
Model Context Protocol (MCP) Go SDK: DNS rebinding vulnerability allows unauthorized access. Red Hat rates this important (CVSS 8). Weakness: CWE-1188. Affected package(s): devspaces/udi-rhel9:1779829736. Resolved in Red Hat advisory RHSA-2026:21772 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat OpenShift Dev Spaces 3.28; OpenShift Serverless.
High [CVE-2026-34601] XML structure injection via CDATA terminator
XML structure injection via CDATA terminator. Red Hat rates this important (CVSS 7.5). Weakness: CWE-91. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-34827] Denial of Service via crafted multipart/form-data requests
Denial of Service via crafted multipart/form-data requests. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Logging Subsystem for Red Hat OpenShift; Red Hat 3scale API Management Platform 2.
High [CVE-2026-34829] Denial of Service via unbounded multipart file upload
Denial of Service via unbounded multipart file upload. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected products named by the advisory: Logging Subsystem for Red Hat OpenShift; Red Hat 3scale API Management Platform 2.
High [CVE-2026-34785] Information disclosure via incorrect static file serving prefix check
Information disclosure via incorrect static file serving prefix check. Red Hat rates this important (CVSS 7.5). Weakness: CWE-552. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-35385] Privilege escalation via scp legacy protocol when not preserving file mode
Privilege escalation via scp legacy protocol when not preserving file mode. Red Hat rates this important (CVSS 7.5). Weakness: CWE-281. Affected package(s): rhaiis/model-opt-cuda-rhel9:1782352950, rhaiis/vllm-spyre-rhel9:1782352919, openssh, rhcos, rhui5/rhua-rhel9:1779798222, rhaiis/model-opt-cuda-rhel9:1780681984. Resolved in Red Hat advisory RHSA-2026:26542 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; and 22 more.
High [CVE-2026-32871] Authenticated Server-Side Request Forgery via path traversal in OpenAPI path parameters
Authenticated Server-Side Request Forgery via path traversal in OpenAPI path parameters. Red Hat rates this important (CVSS 8.5). Weakness: CWE-918. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Satellite 6.18.
High [CVE-2026-31937] Denial of Service via DCERPC buffering inefficiency
Denial of Service via DCERPC buffering inefficiency. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-31935] Denial of Service via HTTP2 continuation frame flooding
Denial of Service via HTTP2 continuation frame flooding. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-31934] Denial of Service via quadratic complexity in URL search of MIME-encoded SMTP messages
Denial of Service via quadratic complexity in URL search of MIME-encoded SMTP messages. Red Hat rates this important (CVSS 7.5). Weakness: CWE-1333. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-31933] Denial of Service due to specially crafted network traffic
Denial of Service due to specially crafted network traffic. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-31932] Denial of Service due to inefficiency in KRB5 buffering
Denial of Service due to inefficiency in KRB5 buffering. Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-31931] Denial of Service via 'tls.alpn' rule keyword
Denial of Service via 'tls.alpn' rule keyword. Red Hat rates this important (CVSS 7.5). Weakness: CWE-476. No fix erratum has been published yet; monitor the Red Hat CVE page and apply the RHSA when released. Affected product named by the advisory: Red Hat Enterprise Linux.
High [CVE-2026-3872] Information disclosure due to redirect_uri validation bypass
Information disclosure due to redirect_uri validation bypass. Red Hat rates this important (CVSS 7.3). Weakness: CWE-601. Affected package(s): rhbk/keycloak-rhel9-operator:26.2, rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.11, rhbk/keycloak-rhel9:26.2, rhbk/keycloak-operator-bundle:26.2.15, rhbk/keycloak-rhel9-operator:26.4. Resolved in Red Hat advisory RHSA-2026:6478 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat build of Keycloak 26.2; Red Hat build of Keycloak 26.4.
High [CVE-2026-4282] Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw
Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw. Red Hat rates this important (CVSS 7.4). Weakness: CWE-653. Affected package(s): rhbk/keycloak-rhel9-operator:26.2, rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.11, rhbk/keycloak-rhel9:26.2, rhbk/keycloak-operator-bundle:26.2.15, rhbk/keycloak-rhel9-operator:26.4. Resolved in Red Hat advisory RHSA-2026:6478 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat build of Keycloak 26.2; Red Hat build of Keycloak 26.4.
High [CVE-2026-4634] Denial of Service via excessive processing of OpenID Connect scope parameters
Denial of Service via excessive processing of OpenID Connect scope parameters. Red Hat rates this important (CVSS 7.5). Weakness: CWE-1050. Affected package(s): rhbk/keycloak-rhel9-operator:26.2, rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.11, rhbk/keycloak-rhel9:26.2, rhbk/keycloak-operator-bundle:26.2.15, rhbk/keycloak-rhel9-operator:26.4. Resolved in Red Hat advisory RHSA-2026:6478 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat build of Keycloak 26.2; Red Hat build of Keycloak 26.4; RHEL-8 based Middleware Containers; Red Hat Single Sign-On 7.6 for RHEL 8; and 2 more.
High [CVE-2026-4636] UMA policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.
UMA policy bypass allows authenticated users to gain unauthorized access to victim-owned resources.. Red Hat rates this important (CVSS 8.1). Weakness: CWE-551. Affected package(s): rhbk/keycloak-rhel9-operator:26.2, rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.11, rhbk/keycloak-rhel9:26.2, rhbk/keycloak-operator-bundle:26.2.15, rhbk/keycloak-rhel9-operator:26.4. Resolved in Red Hat advisory RHSA-2026:6478 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat build of Keycloak 26.2; Red Hat build of Keycloak 26.4.
Medium [CVE-2026-34743] Denial of Service via buffer overflow in index decoding
Denial of Service via buffer overflow in index decoding. Red Hat rates this moderate (CVSS 5.3). Weakness: CWE-131. Affected package(s): xz-main. Resolved in Red Hat advisory RHSA-2026:7647 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-35414] Security bypass via mishandling of authorized_keys principals option
Security bypass via mishandling of authorized_keys principals option. Red Hat rates this moderate (CVSS 4.8). Weakness: CWE-168. Affected package(s): openssh, rhaiis/model-opt-cuda-rhel9:1780681984, rhui5/rhua-rhel9:1779798222, discovery/discovery-server-rhel9:1778101579, rhui5/installer-rhel9:1779798165. Resolved in Red Hat advisory RHSA-2026:14937 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1.
Medium [CVE-2026-4325] Replay of action tokens via improper handling of single-use entries
Replay of action tokens via improper handling of single-use entries. Red Hat rates this moderate (CVSS 5.3). Weakness: CWE-653. Affected package(s): rhbk/keycloak-rhel9-operator:26.2, rhbk/keycloak-rhel9, rhbk/keycloak-operator-bundle:26.4.11, rhbk/keycloak-rhel9:26.2, rhbk/keycloak-operator-bundle:26.2.15, rhbk/keycloak-rhel9-operator:26.4. Resolved in Red Hat advisory RHSA-2026:6478 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
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