CVE catalog

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 pac

[CVE catalog]

Severity
High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
1.33% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiangnutls28sid3.8.13-1fixed
Debiangnutls28forky3.8.13-1fixed
Debiangnutls28trixie3.8.9-3+deb13u4fixed
Debiangnutls28trixie-security3.8.9-3+deb13u4fixed
Debiangnutls28bookworm3.7.9-2+deb12u7fixed
Debiangnutls28bookworm-security3.7.9-2+deb12u7fixed
Cpegnutls28Not reported3.8.3-1.1ubuntu3.6fixed
Cpegnutls-binNot reported3.8.3-1.1ubuntu3.6fixed
Cpegnutls-docNot reported3.8.3-1.1ubuntu3.6fixed
Cpelibgnutls-dane0t64Not reported3.8.3-1.1ubuntu3.6fixed
Cpelibgnutls-openssl27t64Not reported3.8.3-1.1ubuntu3.6fixed
Cpelibgnutls28-devNot reported3.8.3-1.1ubuntu3.6fixed
Cpelibgnutls30t64Not reported3.8.3-1.1ubuntu3.6fixed
CpegnutlsNot reportedNot reportedunknown
Cpehardened_imagesNot reportedNot reportedunknown
Cpeopenshift_container_platformNot reportedNot reportedunknown
Cpeenterprise_linuxNot reportedNot reportedunknown
Cpeenterprise_linux_for_elsNot reportedNot reportedunknown
Cpeenterprise_linux_for_ibm_z_systemsNot reportedNot reportedunknown
Cpeenterprise_linux_for_ibm_z_systems_elsNot reportedNot reportedunknown
Cpeenterprise_linux_for_power_little_endianNot reportedNot reportedunknown
Cpeenterprise_linux_for_power_little_endian_elsNot reportedNot reportedunknown
Cpeenterprise_linux_for_eusNot reportedNot reportedunknown
CpegnutlsNot reportedNot reportedunknown
Cpehardened_imagesNot reportedNot reportedunknown
Cpeopenshift_container_platformNot reportedNot reportedunknown
Cpeenterprise_linuxNot reportedNot reportedunknown
Cpeenterprise_linux_for_elsNot reportedNot reportedunknown
Cpeenterprise_linux_for_ibm_z_systemsNot reportedNot reportedunknown
Cpeenterprise_linux_for_ibm_z_systems_elsNot reportedNot reportedunknown
Cpeenterprise_linux_for_power_little_endianNot reportedNot reportedunknown
Cpeenterprise_linux_for_power_little_endian_elsNot reportedNot reportedunknown
Cpeenterprise_linux_for_eusNot reportedNot reportedunknown
Alpinegnutls3.203.8.13-r0fixed
Alpinegnutls3.213.8.13-r0fixed
Alpinegnutls3.223.8.13-r0fixed
Alpinegnutls3.233.8.13-r0fixed
Alpinegnutls3.243.8.13-r0fixed
Ubuntugnutls28pro3.8.3-1.1ubuntu3.1+Fips1vulnerable
Ubuntugnutls28pro3.8.3-1.1ubuntu3.4+Fips1vulnerable
Ubuntugnutls28pro3.8.3-1.1ubuntu3.4+Fips1.1vulnerable
Ubuntugnutls28pro3.8.3-1.1ubuntu3.5+Fips1.1vulnerable
Ubuntugnutls28pro3.8.3-1.1ubuntu3.6+Fips1.2fixed
Ubuntugnutls2822.043.7.1-5ubuntu1vulnerable
Ubuntugnutls2822.043.7.2-2ubuntu1vulnerable
Ubuntugnutls2822.043.7.2-4ubuntu1vulnerable
Ubuntugnutls2822.043.7.2-5ubuntu1vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.1vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.2vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.3vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.4vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.5vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.6vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.7vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.8vulnerable
Ubuntugnutls2822.043.7.3-4ubuntu1.9fixed
Ubuntugnutls2824.043.8.1-4ubuntu1vulnerable
Ubuntugnutls2824.043.8.1-4ubuntu6vulnerable
Ubuntugnutls2824.043.8.1-4ubuntu7vulnerable
Ubuntugnutls2824.043.8.3-1ubuntu1vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu2vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3.1vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3.2vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3.3vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3.4vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3.5vulnerable
Ubuntugnutls2824.043.8.3-1.1ubuntu3.6fixed
Ubuntugnutls2825.103.8.9-2ubuntu3vulnerable
Ubuntugnutls2825.103.8.9-3ubuntu1vulnerable
Ubuntugnutls2825.103.8.9-3ubuntu2vulnerable
Ubuntugnutls2825.103.8.9-3ubuntu2.1vulnerable
Ubuntugnutls2825.103.8.9-3ubuntu2.2fixed
Ubuntugnutls2826.043.8.9-3ubuntu2vulnerable
Ubuntugnutls2826.043.8.10-3ubuntu1vulnerable
Ubuntugnutls2826.043.8.12-2ubuntu1vulnerable
Ubuntugnutls2826.043.8.12-2ubuntu1.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiangnutls28sourcesid3.8.13-1not yet assignedNot reported[1135319]
Debiangnutls28sourceforky3.8.13-1not yet assignedNot reported[1135319]
Debiangnutls28sourcetrixie3.8.9-3+deb13u4not yet assignedNot reported[1135319]
Debiangnutls28sourcebookworm3.7.9-2+deb12u7not yet assignedNot reported[1135319]
Cpegnutls28cpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Cpegnutls-bincpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Cpegnutls-doccpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Cpelibgnutls-dane0t64cpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Cpelibgnutls-openssl27t64cpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Cpelibgnutls28-devcpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Cpelibgnutls30t64cpeNot reported3.8.3-1.1ubuntu3.6Not reportedNot reportedNot reported
Alpinegnutlsapk3.203.8.13-r0Not reportedALPINE-CVE-2026-42009Not reported
Alpinegnutlsapk3.213.8.13-r0Not reportedALPINE-CVE-2026-42009Not reported
Alpinegnutlsapk3.223.8.13-r0Not reportedALPINE-CVE-2026-42009Not reported
Alpinegnutlsapk3.233.8.13-r0Not reportedALPINE-CVE-2026-42009Not reported
Alpinegnutlsapk3.243.8.13-r0Not reportedALPINE-CVE-2026-42009Not reported
Ubuntugnutls28debpro3.8.3-1.1ubuntu3.6+Fips1.2Not reportedUBUNTU-CVE-2026-42009Not reported
Ubuntugnutls28deb22.043.7.3-4ubuntu1.9Not reportedUBUNTU-CVE-2026-42009Not reported
Ubuntugnutls28deb24.043.8.3-1.1ubuntu3.6Not reportedUBUNTU-CVE-2026-42009Not reported
Ubuntugnutls28deb25.103.8.9-3ubuntu2.2Not reportedUBUNTU-CVE-2026-42009Not reported
Ubuntugnutls28deb26.043.8.12-2ubuntu1.1Not reportedUBUNTU-CVE-2026-42009Not reported

[Debian bug #1135319]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [gnutls-bin]Fixed

    Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • [gnutls-doc]Fixed

    Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · all · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · all · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · all · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · all · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

  • Source package: [gnutls28]

    Details (4)
    • 3.7.9-2+deb12u7 · amd64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · amd64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

    • 3.7.9-2+deb12u7 · arm64 · bookworm-security

      Fixed · Fixed: 3.7.9-2+deb12u7

      nvd · gnutls28 · debian · bookworm; nvd · gnutls28 · debian · 12

[Debian 13 (Trixie)]

  • [gnutls-bin]Fixed

    Source package: [gnutls28]

    Details (4)
    • 3.8.9-3+deb13u4 · amd64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · amd64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

  • [gnutls-doc]Fixed

    Source package: [gnutls28]

    Details (4)
    • 3.8.9-3+deb13u4 · all · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · all · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · all · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · all · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

  • Source package: [gnutls28]

    Details (4)
    • 3.8.9-3+deb13u4 · amd64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · amd64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

  • Source package: [gnutls28]

    Details (4)
    • 3.8.9-3+deb13u4 · amd64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · amd64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

  • Source package: [gnutls28]

    Details (4)
    • 3.8.9-3+deb13u4 · amd64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · amd64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

  • Source package: [gnutls28]

    Details (4)
    • 3.8.9-3+deb13u4 · amd64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · amd64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

    • 3.8.9-3+deb13u4 · arm64 · trixie-security

      Fixed · Fixed: 3.8.9-3+deb13u4

      nvd · gnutls28 · debian · 13

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]