Skip to content
OpenAdvisories
Critical RHSA-2026:72199 1 CVE

Red Hat Security Advisory: unbound security update

Published Sep 27, 2026 · Updated Oct 17, 2026

Ecosystem: Red Hat

Fixed packages 5

ReleasePackageFixed in
Red Hat · RHEL 7 ELS rhel_els:7 unbound 0:1.6.6-5.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7 unbound-debuginfo 0:1.6.6-5.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7 unbound-devel 0:1.6.6-5.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7 unbound-libs 0:1.6.6-5.el7_9.2
Red Hat · RHEL 7 ELS rhel_els:7 unbound-python 0:1.6.6-5.el7_9.2

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_72199.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