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Unbound can let attackers run code remotely

published 25 days ago

Summary

The Unbound DNS software and its Python bindings on Red Hat systems have a flaw that could let a remote attacker execute code on the server. This could compromise the integrity of your network services. Apply the latest security updates for the unbound and python3-unbound packages as soon as possible.

What to do

Update redhat python3-unbound to version 0:1.16.2-3.el9_2.6.
Update redhat python3-unbound-debuginfo to version 0:1.16.2-3.el9_2.6.
Update redhat unbound to version 0:1.16.2-3.el9_2.6.
Update redhat unbound-debuginfo to version 0:1.16.2-3.el9_2.6.
Update redhat unbound-debugsource to version 0:1.16.2-3.el9_2.6.
Update redhat unbound-libs to version 0:1.16.2-3.el9_2.6.
Update redhat unbound-libs-debuginfo to version 0:1.16.2-3.el9_2.6.

Affected software

Ecosystem	Vendor	Product	Affected versions
Red Hat:rhel_e4s:9.2::appstream	redhat	python3-unbound	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6
Red Hat:rhel_e4s:9.2::appstream	redhat	python3-unbound-debuginfo	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6
Red Hat:rhel_e4s:9.2::appstream	redhat	unbound	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6
Red Hat:rhel_e4s:9.2::appstream	redhat	unbound-debuginfo	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6
Red Hat:rhel_e4s:9.2::appstream	redhat	unbound-debugsource	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6
Red Hat:rhel_e4s:9.2::appstream	redhat	unbound-libs	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6
Red Hat:rhel_e4s:9.2::appstream	redhat	unbound-libs-debuginfo	< 0:1.16.2-3.el9_2.6 Fix: upgrade to 0:1.16.2-3.el9_2.6

Original advisory text

Red Hat Security Advisory: unbound security update

References

https://access.redhat.com/errata/RHSA-2026:71610 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_71610.... 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-2026:71610 · OSV

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