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OpenAdvisories
Critical RHSA-2026:72183 1 CVE

Red Hat Security Advisory: unbound security update

Published Sep 26, 2026 · Updated Oct 17, 2026

Ecosystem: Red Hat

Fixed packages 4

ReleasePackageFixed in
Red Hat · RHEL 8.4 AUS rhel_aus:8.4::appstream unbound 0:1.7.3-15.el8_4.4
Red Hat · RHEL 8.4 AUS rhel_aus:8.4::appstream unbound-libs 0:1.7.3-15.el8_4.4
Red Hat · RHEL 8.4 EUS Long Life rhel_eus_long_life:8.4::appstream unbound 0:1.7.3-15.el8_4.4
Red Hat · RHEL 8.4 EUS Long Life rhel_eus_long_life:8.4::appstream unbound-libs 0:1.7.3-15.el8_4.4

Vulnerabilities 1

  • Critical 9.1
    CVE-2026-81642 Public exploit

    Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY

    In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#critical
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2535059
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_72183.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-81642
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-81642
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-81642
  • article
    https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt