CVE-2026-42009

published 2026-05-18

CVE-2026-42009: 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…

high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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

2 ranges

Vendor	Product	Version range	Fixed in
gnu	gnutls	—	—
ubuntu	gnutls28	—	—

CWE-475