Red Hat Linux Security Advisories & Vulnerabilities
16036 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-2026-7568] signed integer overflow in metaphone()
signed integer overflow in metaphone(). Red Hat rates this important (CVSS 7.5). Weakness: CWE-190. Affected package(s): php, php8.4, php:8.2, php:7.4, php:8.3. Resolved in Red Hat advisory RHSA-2026:22649 — 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.
Medium [CVE-2026-7258] Denial of Service via improper handling of signed characters in ctype functions
Denial of Service via improper handling of signed characters in ctype functions. Red Hat rates this moderate (CVSS 5.9). Weakness: CWE-839. Affected package(s): php, php8.4, php:8.2, php:7.4, php:8.3, php-main. Resolved in Red Hat advisory RHSA-2026:22649 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1.
Medium [CVE-2026-7259] NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init(). Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-476. Affected package(s): php. Resolved in Red Hat advisory RHSA-2026:33449 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1.
Medium [CVE-2026-7261] Memory corruption and information disclosure via incorrect persistence handling
Memory corruption and information disclosure via incorrect persistence handling. Red Hat rates this moderate (CVSS 5.6). Weakness: CWE-825. Affected package(s): php, php:7.4. Resolved in Red Hat advisory RHSA-2026:33449 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9.
Medium [CVE-2026-6735] Cross-Site Scripting vulnerability via improper URL sanitation
Cross-Site Scripting vulnerability via improper URL sanitation. Red Hat rates this moderate (CVSS 5.4). Weakness: CWE-79. Affected package(s): php, php8.4, php:8.2, php:7.4, php:8.3, php-main. Resolved in Red Hat advisory RHSA-2026:22649 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1.
High [CVE-2026-42258] Net::IMAP: IMAP Command Injection via Symbol Arguments
Net::IMAP: IMAP Command Injection via Symbol Arguments. Red Hat rates this important (CVSS 7.1). Weakness: CWE-93. Affected package(s): ruby, ruby4.0, ruby:3.3, ruby:2.5, ruby:4.0. Resolved in Red Hat advisory RHSA-2026:33514 — 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 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 10 more.
High [CVE-2026-42246] Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS
Net::IMAP: Information disclosure via man-in-the-middle attack bypassing TLS. Red Hat rates this important (CVSS 7.4). Weakness: CWE-325. Affected package(s): ruby, ruby4, ruby4.0, ruby:3.3, ruby3, ruby:2.5. Resolved in Red Hat advisory RHSA-2026:33514 — 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 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; and 9 more.
High [CVE-2026-41163] Privilege escalation via ptrace when installed in setuid mode
Privilege escalation via ptrace when installed in setuid mode. Red Hat rates this important (CVSS 7). Weakness: CWE-269. 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-2026-42296] Privilege escalation via security control bypass
Privilege escalation via security control bypass. Red Hat rates this important (CVSS 8.1). Weakness: CWE-863. 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 OpenShift AI (RHOAI).
High [CVE-2026-42294] Denial of Service via large request body to Webhook Interceptor
Denial of Service via large request body to Webhook Interceptor. 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 OpenShift AI (RHOAI).
High [CVE-2026-42297] Unauthorized ConfigMap manipulation due to missing authorization
Unauthorized ConfigMap manipulation due to missing authorization. Red Hat rates this important (CVSS 8.3). Weakness: CWE-425. 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 OpenShift AI (RHOAI).
High [CVE-2026-4890] NSEC bitmap parsing infinite loop
NSEC bitmap parsing infinite loop. Red Hat rates this important (CVSS 7.5). Weakness: CWE-835. Affected package(s): dnsmasq. Resolved in Red Hat advisory RHSA-2026:20589 — 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 9.6 Extended Update Support; Red Hat OpenShift Container Platform 4.19.
High [CVE-2026-4891] RRSIG rdlen underflow leading to heap OOB read
RRSIG rdlen underflow leading to heap OOB read. Red Hat rates this important (CVSS 7.5). Weakness: CWE-125. Affected package(s): dnsmasq. Resolved in Red Hat advisory RHSA-2026:20589 — 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 9.6 Extended Update Support; Red Hat Enterprise Linux 6; and 2 more.
High [CVE-2026-4892] DHCPv6 CLID buffer overflow in helper process
DHCPv6 CLID buffer overflow in helper process. Red Hat rates this important (CVSS 8.8). Weakness: CWE-122. Affected package(s): dnsmasq. Resolved in Red Hat advisory RHSA-2026:20589 — 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 9.6 Extended Update Support; Red Hat Enterprise Linux 6; and 2 more.
High [CVE-2026-5172] extract_addresses() OOB read via malformed rdlen
extract_addresses() OOB read via malformed rdlen. Red Hat rates this important (CVSS 7.5). Weakness: CWE-125. Affected package(s): dnsmasq. Resolved in Red Hat advisory RHSA-2026:19158 — 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.
Medium [CVE-2026-42256] Net::IMAP: Denial of Service via large iteration count in SCRAM authentication
Net::IMAP: Denial of Service via large iteration count in SCRAM authentication. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-606. Affected package(s): ruby3, ruby4. Resolved in Red Hat advisory RHSA-2026:33552 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-42245] Net::IMAP: Denial of Service via crafted IMAP responses
Net::IMAP: Denial of Service via crafted IMAP responses. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-606. Affected package(s): ruby3, ruby:3.3, ruby4, ruby4.0, ruby, ruby:4.0. Resolved in Red Hat advisory RHSA-2026:33515 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 1.
Medium [CVE-2026-42310] Denial of Service via malicious PDF processing
Denial of Service via malicious PDF processing. Red Hat rates this moderate (CVSS 4). Weakness: CWE-835. Affected package(s): rhaiis/vllm-rocm-rhel9:1778244531, rhaiis/vllm-cuda-rhel9:1778274666, rhaiis/model-opt-cuda-rhel9:1778244559. Resolved in Red Hat advisory RHSA-2026:16030 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-42309] Denial of Service via specially crafted coordinate input
Denial of Service via specially crafted coordinate input. Red Hat rates this moderate (CVSS 5.1). Weakness: CWE-131. Affected package(s): rhaiis/vllm-rocm-rhel9:1778244531, rhaiis/vllm-cuda-rhel9:1778274666, rhaiis/model-opt-cuda-rhel9:1778244559. Resolved in Red Hat advisory RHSA-2026:16030 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux.
Medium [CVE-2026-2291] heap buffer overflow in cache via NAME_ESCAPE expansion
heap buffer overflow in cache via NAME_ESCAPE expansion. Red Hat rates this moderate (CVSS 6.5). Weakness: CWE-131. Affected package(s): dnsmasq. Resolved in Red Hat advisory RHSA-2026:20589 — update the affected packages (`sudo dnf update`). Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 8.
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