Red Hat Linux Security Advisories & Vulnerabilities
16038 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-2026-42534] Denial of Service due to degraded resolution performance in jostle logic
Denial of Service due to degraded resolution performance in jostle logic. Red Hat rates this important (CVSS 7.5). Weakness: CWE-911. 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: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 3 more.
High [CVE-2026-41292] Denial of Service via excessive EDNS options
Denial of Service via excessive EDNS options. Red Hat rates this important (CVSS 7.5). Weakness: CWE-1050. 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: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 6 more.
High [CVE-2026-9064] unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)
unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS). Red Hat rates this important (CVSS 7.5). Weakness: CWE-770. Affected package(s): 389-ds-base, 389-ds:1.4, redhat-ds:11, redhat-ds:12, dirsrv/dirsrv-container-rhel10:1781714123. Resolved in Red Hat advisory RHSA-2026:26463 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Directory Server 11.5 E4S for RHEL 8; Red Hat Directory Server 11.7 E4S for RHEL 8; Red Hat Directory Server 11.9 for RHEL 8; Red Hat Directory Server 12.2 E4S for RHEL 9; and 13 more.
High [CVE-2026-47783] Username enumeration via timing side channel
Username enumeration via timing side channel. Red Hat rates this important (CVSS 8.1). Weakness: CWE-208. Affected package(s): memcached. Resolved in Red Hat advisory RHSA-2026:27862 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; and 2 more.
High [CVE-2026-43618] Remote memory disclosure via integer overflow in compressed-token decoding
Remote memory disclosure via integer overflow in compressed-token decoding. Red Hat rates this important (CVSS 8.1). Weakness: CWE-190. Affected package(s): rsync, discovery/discovery-ui-rhel9:1782166952. Resolved in Red Hat advisory RHSA-2026:26410 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux AppStream (v. 10); Red Hat Enterprise Linux AppStream (v. 9); Red Hat Enterprise Linux BaseOS (v. 10); Red Hat Enterprise Linux BaseOS (v. 8); and 8 more.
High [CVE-2026-29518] TOCTOU symlink race condition allowing local privilege escalation in daemon mode without chroot.
TOCTOU symlink race condition allowing local privilege escalation in daemon mode without chroot.. Red Hat rates this important (CVSS 7.8). Weakness: CWE-367. Affected package(s): rsync, discovery/discovery-ui-rhel9:1782166952. Resolved in Red Hat advisory RHSA-2026:26410 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux AppStream (v. 10); Red Hat Enterprise Linux AppStream (v. 9); Red Hat Enterprise Linux BaseOS (v. 10); Red Hat Enterprise Linux BaseOS (v. 8); and 8 more.
High [CVE-2026-42959] Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages
Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages. Red Hat rates this important (CVSS 7.5). Weakness: CWE-824. Affected package(s): unbound-main, unbound. Resolved in Red Hat advisory RHSA-2026:23231 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images; and 2 more.
Medium [CVE-2026-9150] Stack-based buffer overflow in libsolv's Debian metadata parser when handling SHA384/SHA512 checksums
Stack-based buffer overflow in libsolv's Debian metadata parser when handling SHA384/SHA512 checksums. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-121. Affected package(s): libsolv, libsolv-main. Resolved in Red Hat advisory RHSA-2026:28236 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Hardened Images; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 9; and 3 more.
Medium [CVE-2026-9149] Heap buffer overflow in libsolv repo_add_solv via negative maxsize from crafted .solv file
Heap buffer overflow in libsolv repo_add_solv via negative maxsize from crafted.solv file. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-122. Affected package(s): libsolv, libsolv-main. Resolved in Red Hat advisory RHSA-2026:28236 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Hardened Images; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 4 more.
Medium [CVE-2026-9087] Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login
Cross-Session Email Verification Proof Not Bound to Upstream Identity in First-Broker-Login. Red Hat rates this moderate (CVSS 6.4). Weakness: CWE-639. Affected package(s): rhbk/keycloak-operator-bundle:26.4.13, rhbk/keycloak-rhel9-operator:26.4, rhbk/keycloak-rhel9, rhbk/keycloak-rhel9:26.4, rhbk/keycloak-operator-bundle:26.6.3, rhbk/keycloak-rhel9:26.6. Resolved in Red Hat advisory RHSA-2026:30049 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat build of Keycloak 26.4; Red Hat build of Keycloak 26.6.
Medium [CVE-2026-44608] Denial of Service due to locking inconsistency during RPZ XFR reload
Denial of Service due to locking inconsistency during RPZ XFR reload. Red Hat rates this moderate (CVSS 5.9). Weakness: CWE-367. Affected package(s): unbound-main. Resolved in Red Hat advisory RHSA-2026:19752 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-47784] Information disclosure via timing side channel
Information disclosure via timing side channel. Red Hat rates this moderate (CVSS 5.9). Weakness: CWE-208. Affected package(s): memcached-main. Resolved in Red Hat advisory RHSA-2026:23261 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-42960] Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance
Unbound DNS Cache Poisoning via Promiscuous Additional Section RRSet Acceptance. Red Hat rates this moderate (CVSS 5.9). Weakness: CWE-349. Affected package(s): unbound-main. Resolved in Red Hat advisory RHSA-2026:20357 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-42923] Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS
Unbound DNSSEC Validator NSEC3 Hash Calculation Limit Bypass via Negative Cache Code Path Leading to DoS. Red Hat rates this moderate (CVSS 5.3). Weakness: CWE-400. Affected package(s): unbound-main. Resolved in Red Hat advisory RHSA-2026:20357 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Critical [CVE-2026-47323] Remote Code Execution via header injection due to missing inbound filtering
Remote Code Execution via header injection due to missing inbound filtering. Red Hat rates this critical (CVSS 9.8). Weakness: CWE-791. 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: OpenShift Serverless.
Critical [CVE-2026-2611] Arbitrary Code Execution via Improper Origin Validation
Arbitrary Code Execution via Improper Origin Validation. Red Hat rates this critical (CVSS 9.6). Weakness: CWE-940. 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.
Critical [CVE-2026-9118] Use after free in XR
Use after free in XR. Red Hat rates this important (CVSS 9.6). Weakness: CWE-825. 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.
Critical [CVE-2026-9120] Use after free in WebRTC
Use after free in WebRTC. Red Hat rates this important (CVSS 9.6). 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.
Critical [CVE-2026-9115] Insufficient policy enforcement in Service Worker
Insufficient policy enforcement in Service Worker. Red Hat rates this important (CVSS 9.3). Weakness: CWE-940. 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.
Critical [CVE-2026-9119] Heap buffer overflow in WebRTC
Heap buffer overflow in WebRTC. Red Hat rates this important (CVSS 9.6). Weakness: CWE-120. 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.
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