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OpenAdvisories
High RHSA-2025:12520 1 CVE

Red Hat Security Advisory: unbound security update

Published Aug 5, 2025 · Updated Oct 15, 2026

Ecosystem: Red Hat

Fixed packages 7

ReleasePackageFixed in
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream python3-unbound 0:1.13.1-13.el9_0.5
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream python3-unbound-debuginfo 0:1.13.1-13.el9_0.5
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream unbound 0:1.13.1-13.el9_0.5
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream unbound-debuginfo 0:1.13.1-13.el9_0.5
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream unbound-debugsource 0:1.13.1-13.el9_0.5
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream unbound-libs 0:1.13.1-13.el9_0.5
Red Hat · RHEL 9.0 E4S rhel_e4s:9.0::appstream unbound-libs-debuginfo 0:1.13.1-13.el9_0.5

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

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2380949
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_12520.json
  • report
    https://access.redhat.com/security/cve/CVE-2025-5994
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2025-5994
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2025-5994
  • article
    https://nlnetlabs.nl/downloads/unbound/CVE-2025-5994.txt