RHSA-2026:84753MediumCVSS 5.9

Red Hat Security Advisory: glibc security update

Published
October 19, 2026
Last Modified
October 30, 2026

🔗 CVE IDs covered (4)

CVE-2026-77117 →CVE-2026-80489 →CVE-2026-8674 →CVE-2026-18374 →

📋 Description

CVE-2026-8674 — glibc: glibc DNS stub resolver: Denial of Service via long search domain in configuration CVE-2026-18374 — glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string CVE-2026-77117 — glibc: Non-progress DoS in SHIFT_JISX0213 -&gt CVE-2026-80489 — glibc: Non-progress DoS in EUC_JISX0213 -> UCS-4 conversion state

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux BaseOS (v. 10)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-0:2.39-145.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-0:2.39-145.el10_2.src as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-0:2.39-145.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-all-langpacks-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-all-langpacks-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-all-langpacks-0:2.39-145.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-all-langpacks-0:2.39-145.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-benchtests-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-0:2.39-145.el10_2.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-0:2.39-145.el10_2.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-benchtests-debuginfo-0:2.39-145.el10_2.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • glibc-common-0:2.39-145.el10_2.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • glibc-common-0:2.39-145.el10_2.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 10)
  • +170 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: Do not convert untrusted input using the SHIFT_JISX0213 character set (for example via iconv). Where conversion cannot be avoided, apply process CPU time limits and container cgroup resource limits so a hung converter cannot exhaust host resources. Workaround: To mitigate this avoid converting untrusted data with that charset, or disable the conversion path if unused. Where conversion of untrusted input cannot be avoided, restrict access to trusted clients and apply process CPU/resource limits to contain hang impact.

🔗 References (7)