RHSA-2026:23231HighCVSS 8.1

Red Hat Security Advisory: unbound security update

Published
June 4, 2026
Last Modified
August 24, 2026

🔗 CVE IDs covered (3)

CVE-2026-42959 →CVE-2026-33278 →CVE-2026-42944 →

📋 Description

CVE-2026-33278 — unbound: Unbound DNSSEC Validator Use-After-Free via Deep Copy Pointer Overwrite Leading to DoS and Possible Remote Code Execution CVE-2026-42944 — unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options CVE-2026-42959 — unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages

🎯 Affected products79

  • Red Hat Enterprise Linux AppStream (v. 10)
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • python3-unbound-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • python3-unbound-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • unbound-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-0:1.24.2-7.el10_2.1.src as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.ppc64le as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.s390x as a component of Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
  • unbound-anchor-debuginfo-0:1.24.2-7.el10_2.1.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 10)
  • +49 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.

🔗 References (6)