| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6281-1 |
| Debian Bugs | 1135319 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| gnutls28 (PTS) | bullseye | 3.7.1-5+deb11u5 | vulnerable |
| bullseye (security) | 3.7.1-5+deb11u9 | vulnerable | |
| bookworm | 3.7.9-2+deb12u6 | vulnerable | |
| bookworm (security) | 3.7.9-2+deb12u7 | fixed | |
| trixie | 3.8.9-3+deb13u3 | vulnerable | |
| trixie (security) | 3.8.9-3+deb13u4 | fixed | |
| forky, sid | 3.8.13-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| gnutls28 | source | bookworm | 3.7.9-2+deb12u7 | DSA-6281-1 | ||
| gnutls28 | source | trixie | 3.8.9-3+deb13u4 | DSA-6281-1 | ||
| gnutls28 | source | (unstable) | 3.8.13-1 | 1135319 |
https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-2
https://gitlab.com/gnutls/gnutls/-/issues/1848
Fixed by: https://gitlab.com/gnutls/gnutls/-/commit/f01e21441e29052a6f0963840794c41d3b3ee66d (3.8.13)
Fixed by: https://gitlab.com/gnutls/gnutls/-/commit/f341441fad91142897d83b44a175ffc8f925b76f (3.8.13)