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High RLSA-2025:11884 1 CVE

Important: unbound security update

Published May 29, 2026 · Updated May 29, 2026

Ecosystem: Rocky Linux

Summary

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

Security Fix(es):

* unbound: Unbound Cache poisoning (CVE-2025-5994)

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 1

ReleasePackageFixed in
Rocky Linux · 8 unbound 0:1.16.2-5.9.el8

Vulnerabilities 1

  • High 8.7
    CVE-2025-5994

    Cache poisoning via the ECS-enabled Rebirthday Attack

    A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send E…

    NLnet Labs Unbound unbound unbound Debian Ubuntu Alpine

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2380949