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Unbound DNS server could be exploited to run code

published 25 days ago

Summary

The Unbound DNS server and its Python packages have a flaw that could let an attacker execute commands on the system. This could compromise the server and any data it handles. Apply the latest security update from Red Hat to fix the issue.

What to do

Update redhat python3-unbound to version 0:1.16.2-5.14.el8_10.4.
Update redhat python3-unbound-debuginfo to version 0:1.16.2-5.14.el8_10.4.
Update redhat unbound to version 0:1.16.2-5.14.el8_10.4.
Update redhat unbound-debuginfo to version 0:1.16.2-5.14.el8_10.4.
Update redhat unbound-debugsource to version 0:1.16.2-5.14.el8_10.4.
Update redhat unbound-devel to version 0:1.16.2-5.14.el8_10.4.
Update redhat unbound-libs to version 0:1.16.2-5.14.el8_10.4.
Update redhat unbound-libs-debuginfo to version 0:1.16.2-5.14.el8_10.4.

Affected software

Ecosystem	Vendor	Product	Affected versions
Red Hat:enterprise_linux:8::appstream	redhat	python3-unbound	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	python3-unbound-debuginfo	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	unbound	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	unbound-debuginfo	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	unbound-debugsource	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	unbound-devel	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	unbound-libs	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4
Red Hat:enterprise_linux:8::appstream	redhat	unbound-libs-debuginfo	< 0:1.16.2-5.14.el8_10.4 Fix: upgrade to 0:1.16.2-5.14.el8_10.4

Original advisory text

Red Hat Security Advisory: unbound security update

References

https://access.redhat.com/errata/RHSA-2026:70754 Vendor Advisory
https://access.redhat.com/security/updates/classification/#critical Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2535051 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2535054 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_70754.... Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-81634 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-81634 Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-81634 Vendor Advisory
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81634.txt Third Party 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
https://access.redhat.com/security/cve/CVE-2026-82717 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-82717 Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-82717 Vendor Advisory
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-82717.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

Published24 Sep 2026

Updated24 Sep 2026

First seen24 Sep 2026

Sources

RHSA-2026:70754 · OSV

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