HIGH Published May 18, 2026

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 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 score
7.5 (v3.1)
Severity
HIGH
Attack vector
Network
Weakness
CWE-475
Last modified
October 30, 2026
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

gnu gnutls redhat hardened images redhat openshift container platform redhat enterprise linux redhat enterprise linux for els redhat enterprise linux for ibm z systems redhat enterprise linux for ibm z systems els redhat enterprise linux for power little endian redhat enterprise linux for power little endian els redhat enterprise linux for eus

References

View full NVD advisory →

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