Skip to content
OpenAdvisories
High RHSA-2026:24365 2 CVEs

Red Hat Security Advisory: unbound security update

Published Jun 8, 2026 · Updated Oct 19, 2026

Ecosystem: Red Hat

Fixed packages 8

ReleasePackageFixed in
Red Hat · RHEL 8 enterprise_linux:8::appstream python3-unbound 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream python3-unbound-debuginfo 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream unbound 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream unbound-debuginfo 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream unbound-debugsource 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream unbound-devel 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream unbound-libs 0:1.16.2-5.11.el8_10
Red Hat · RHEL 8 enterprise_linux:8::appstream unbound-libs-debuginfo 0:1.16.2-5.11.el8_10

Vulnerabilities 2

  • 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
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_24365.json
  • 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