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CVE-2026-42009

HIGH CVSS: 7.5 Published: 2026-05-18 Modified: 2026-07-23

Description

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.

Affected Platforms

Redhat Hardened ImagesRedhat Enterprise Linux For Ibm Z Systems ElsRedhat Enterprise Linux For Ibm Z SystemsRedhat Enterprise LinuxRedhat Enterprise Linux For Power Little EndianRedhat Enterprise Linux For EusRedhat Enterprise Linux For ElsRedhat Openshift Container PlatformRedhat Enterprise Linux For Power Little Endian ElsRedhat Enterprise Linux For Ibm Z Systems Eus

Weakness Type

CWE-475, CWE-475

References