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Red Hat Unbound may allow remote code execution

published 24 days ago

Summary

The Unbound DNS resolver and its libraries in Red Hat can be tricked into running malicious code. This could let an attacker take control of the server hosting the service. Apply the latest Red Hat security update for Unbound and Unbound-libs as soon as possible.

What to do

Update redhat unbound to version 0:1.16.2-19.el9_6.2.
Update redhat unbound-libs to version 0:1.16.2-19.el9_6.2.

Affected software

Ecosystem	Vendor	Product	Affected versions
Red Hat:rhel_eus:9.6::appstream	redhat	unbound	< 0:1.16.2-19.el9_6.2 Fix: upgrade to 0:1.16.2-19.el9_6.2
Red Hat:rhel_eus:9.6::appstream	redhat	unbound-libs	< 0:1.16.2-19.el9_6.2 Fix: upgrade to 0:1.16.2-19.el9_6.2

Original advisory text

Red Hat Security Advisory: unbound security update

References

https://access.redhat.com/errata/RHSA-2026:71460 Vendor Advisory
https://access.redhat.com/security/updates/classification/#critical Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2535059 Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_71460.... Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-81642 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-81642 Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-81642 Vendor Advisory
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt Third Party Advisory

Fix within

Internet-facing 3 days

Internal 60 days

Not known to be exploited
Can be exploited automatically (estimated)
Gives an attacker full control (estimated)

Severity

9.8 Critical

Timeline

Published25 Sep 2026

Updated25 Sep 2026

First seen25 Sep 2026

Sources

RHSA-2026:71460 · OSV

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