CVE-2026-42944 Affecting unbound-debugsource package, versions <0:1.24.2-3.el9_8.1


Severity

Recommended
0.0
high
0
10

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.84% (54th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ROCKY9-UNBOUNDDEBUGSOURCE-17314791
  • published12 Jun 2026
  • disclosed20 May 2026

Introduced: 20 May 2026

CVE-2026-42944  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 unbound-debugsource to version 0:1.24.2-3.el9_8.1 or higher.
This issue was patched in RLSA-2026:24369.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound-debugsource package and not the unbound-debugsource package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 relevant fixed versions and status.

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.

CVSS Base Scores

version 3.1