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Unbound DNS resolver could be tricked into running code

published 22 days ago

Summary

The Unbound DNS server packages for Red Hat (including the main program, libraries, development files, debug info, and Python bindings) may allow an attacker to supply crafted data that could cause the software to execute unwanted code. This could let an attacker take control of the server or disrupt DNS services. Install the latest Unbound update from Red Hat as soon as possible to protect your systems.

What to do

Update redhat unbound to version 0:1.6.6-5.el7_9.2.
Update redhat unbound-debuginfo to version 0:1.6.6-5.el7_9.2.
Update redhat unbound-libs to version 0:1.6.6-5.el7_9.2.
Update redhat unbound-devel to version 0:1.6.6-5.el7_9.2.
Update redhat unbound-python to version 0:1.6.6-5.el7_9.2.

Affected software

Ecosystem	Vendor	Product	Affected versions
Red Hat:rhel_els:7	redhat	unbound	< 0:1.6.6-5.el7_9.2 Fix: upgrade to 0:1.6.6-5.el7_9.2
Red Hat:rhel_els:7	redhat	unbound-debuginfo	< 0:1.6.6-5.el7_9.2 Fix: upgrade to 0:1.6.6-5.el7_9.2
Red Hat:rhel_els:7	redhat	unbound-libs	< 0:1.6.6-5.el7_9.2 Fix: upgrade to 0:1.6.6-5.el7_9.2
Red Hat:rhel_els:7	redhat	unbound-devel	< 0:1.6.6-5.el7_9.2 Fix: upgrade to 0:1.6.6-5.el7_9.2
Red Hat:rhel_els:7	redhat	unbound-python	< 0:1.6.6-5.el7_9.2 Fix: upgrade to 0:1.6.6-5.el7_9.2

Original advisory text

Red Hat Security Advisory: unbound security update

References

https://access.redhat.com/errata/RHSA-2026:72199 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_72199.... 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

Published27 Sep 2026

Updated30 Sep 2026

First seen30 Sep 2026

Sources

RHSA-2026:72199 · OSV

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