Skip to content
OpenAdvisories
Medium ALSA-2026:68292 1 CVE

Moderate: unbound security update

Published Sep 16, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

Security Fix(es):

* unbound: Unbound: DNS cache poisoning via UDP source port predictability (CVE-2026-50252)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 5

ReleasePackageFixed in
AlmaLinux · 9 python3-unbound 1.24.2-3.el9_8.6
AlmaLinux · 9 unbound 1.24.2-3.el9_8.6
AlmaLinux · 9 unbound-devel 1.24.2-3.el9_8.6
AlmaLinux · 9 unbound-dracut 1.24.2-3.el9_8.6
AlmaLinux · 9 unbound-libs 1.24.2-3.el9_8.6

Vulnerabilities 1

  • Medium 5.7
    CVE-2026-50252

    Possible cache poisoning attack by mapping source port population per thread

    In NLnet Labs Unbound 1.4.22 up to and including 1.25.1, UDP source port is randomized and intended to serve as a secret value that increases the entropy of DNS transactions. When resolver load balancing policies depend on the source port while their outcome …

    NLnet Labs Unbound unbound unbound Debian Ubuntu Azure Linux Alpine

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-50252
  • report
    https://bugzilla.redhat.com/2506133
  • advisory
    https://errata.almalinux.org/9/ALSA-2026-68292.html