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Affected Component
Analysis
gnutls
Patched
Name
CVE-2026-42009
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.
Published Date
Updated Date
Workaround
-
Advisories
https://access.redhat.com/errata/RHSA-2026:13274Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20611Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20612Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20613Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-42009Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2467279Issue Tracking
https://access.redhat.com/errata/RHSA-2026:13274Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20611Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20612Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:20613Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-42009Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2467279Issue Tracking
Analysis#
Vulnerability Ratings#
7.5
CVSSv31
7.5
CVSSv31
NaN
other
Others affected components#
Resolved with patches#
gnutls (yocto:scarthgap)
#
Title
Author
Resolve
1
lib/buffers: ensure packets have differing sequence
Alexander Sosedkin <asosedkin@redhat.com>
CVE-2026-42009
2
buffers: fix handshake_compare when sequence numbers
Joshua Rogers <joshua@joshua.hu>
CVE-2026-42009