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OpenAdvisories
Critical RHSA-2026:23231 3 CVEs

Red Hat Security Advisory: unbound security update

Published Jun 4, 2026 · Updated Oct 19, 2026

Ecosystem: Red Hat

Fixed packages 13

ReleasePackageFixed in
Red Hat · RHEL 10 enterprise_linux:10.2 python3-unbound 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 python3-unbound-debuginfo 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-anchor 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-anchor-debuginfo 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-debuginfo 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-debugsource 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-devel 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-dracut 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-libs 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-libs-debuginfo 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-utils 0:1.24.2-7.el10_2.1
Red Hat · RHEL 10 enterprise_linux:10.2 unbound-utils-debuginfo 0:1.24.2-7.el10_2.1

Vulnerabilities 3

  • Critical 9.1
    CVE-2026-33278

    Possible arbitrary code execution during DNSSEC validation

    NLnet Labs Unbound 1.19.1 up to and including version 1.25.0 has a vulnerability in the DNSSEC validator that enables denial of service and possible remote code execution as a result of deep copying a data structure and erroneously overwriting a destination p…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine
  • High 8.7
    CVE-2026-42944

    Heap overflow with multiple NSID, COOKIE, PADDING EDNS options

    NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', '…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine
  • High 8.7
    CVE-2026-42959

    Crash during DNSSEC validation of malicious content

    NLnet Labs Unbound up to and including version 1.25.0 has a denial of service vulnerability in the DNSSEC validator that can lead to a crash given malicious upstream replies. When Unbound constructs chase-reply messages for validation, the code uses the wrong…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479774
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479806
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2479808
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_23231.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-33278
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-33278
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-33278
  • report
    https://access.redhat.com/security/cve/CVE-2026-42944
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-42944
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-42944
  • report
    https://access.redhat.com/security/cve/CVE-2026-42959
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-42959
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-42959