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Red Hat Unbound can be exploited for remote code execution

published 23 days ago

Summary

The Unbound DNS resolver and its library on Red Hat systems contain a flaw that could let an attacker run code on the server. This could give the attacker control over the affected machine and any data it handles. Apply the latest Red Hat security update for Unbound and Unbound‑libs as soon as possible.

What to do

Update redhat unbound to version 0:1.7.3-17.el8_6.8.
Update redhat unbound-libs to version 0:1.7.3-17.el8_6.8.

Affected software

Ecosystem	Vendor	Product	Affected versions
Red Hat:rhel_aus:8.6::appstream	redhat	unbound	< 0:1.7.3-17.el8_6.8 Fix: upgrade to 0:1.7.3-17.el8_6.8
Red Hat:rhel_aus:8.6::appstream	redhat	unbound-libs	< 0:1.7.3-17.el8_6.8 Fix: upgrade to 0:1.7.3-17.el8_6.8
Red Hat:rhel_eus_long_life:8.6::appstream	redhat	unbound	< 0:1.7.3-17.el8_6.8 Fix: upgrade to 0:1.7.3-17.el8_6.8
Red Hat:rhel_eus_long_life:8.6::appstream	redhat	unbound-libs	< 0:1.7.3-17.el8_6.8 Fix: upgrade to 0:1.7.3-17.el8_6.8

Original advisory text

Red Hat Security Advisory: unbound security update

References

https://access.redhat.com/errata/RHSA-2026:72110 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_72110.... 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

Published26 Sep 2026

Updated30 Sep 2026

First seen30 Sep 2026

Sources

RHSA-2026:72110 · OSV

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