Undefined Behavior for Input to API Affecting gnutls package, versions <0:3.6.16-8.el8_10.6


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.49% (66th percentile)

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  • Snyk IDSNYK-RHEL8-GNUTLS-16752365
  • published19 May 2026
  • disclosed29 Apr 2026

Introduced: 29 Apr 2026

CVE-2026-42009  (opens in a new tab)
CWE-475  (opens in a new tab)

How to fix?

Upgrade RHEL:8 gnutls to version 0:3.6.16-8.el8_10.6 or higher.
This issue was patched in RHSA-2026:20611.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls package and not the gnutls package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in gnutls. A remote attacker could exploit an issue in the Datagram Transport Layer Security (DTLS) packet reordering logic. The comparator function, responsible for ordering DTLS packets by sequence numbers, did not correctly handle packets with duplicate sequence numbers. This could lead to unstable packet ordering or undefined behavior, resulting in a denial of service.

CVSS Base Scores

version 3.1