CVE-2026-42944
CVE-2026-42944 · Heap overflow with multiple NSID, COOKIE, PADDING EDNS options
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options ('nsid', 'answer-cookie', 'pad-responses' (default)) need to be enabled for the vulnerability to be exploited. An adversary who can query Unbound can exploit the vulnerability by attaching multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options to the query. A flaw in the size calculation of the EDNS field truncates the correct value which allows the encoder to overflow the available space when writing. Those two combined lead to a heap overflow write of Unbound controlled data and eventually a crash. Unbound 1.25.1 contains a patch with a fix to de-duplicate the EDNS options and a fix to prevent truncation of the EDNS field size calculation.
CVSS 8.7 · Alta · EPSS 0,8% · Corrección disponible
- Publicación
- Actualización
Pila tecnológica: system
Productos y versiones afectados
unbound
- Versiones
- ≥ 1.14.0, < 1.25.1: Afectada (semver)
Actualiza a 1.25.1
unbound Debian:12
- Versiones
- 1.17.1-2
- 1.17.1-2+deb12u1
- 1.17.1-2+deb12u2
- 1.17.1-2+deb12u3
- 1.17.1-2+deb12u4
- 1.17.1-2+loong64
- 1.18.0-1
- 1.18.0-2
- 1.19.1-1
- 1.19.2-1
- 1.20.0-1
- 1.21.1-1
- 1.22.0-1
- 1.22.0-2
- 1.23.1-1
- 1.24.0-1
- 1.24.0-2
- 1.24.1-1
- 1.24.1-2
- 1.24.2-1
- 1.25.0-1
- 1.25.1-1
- 1.25.2-1
- 1.26.0-1
- 1.26.0-2
- 1.26.1-1
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
unbound Debian:13
- Versiones
- 1.22.0-2
- 1.22.0-2+deb13u1
- 1.22.0-2+deb13u2
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.22.0-2+deb13u3
Actualiza a 1.22.0-2+deb13u3
unbound Debian:14
- Versiones
- 1.22.0-2
- 1.23.1-1
- 1.24.0-1
- 1.24.0-2
- 1.24.1-1
- 1.24.1-2
- 1.24.2-1
- 1.25.0-1
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.25.1-1
Actualiza a 1.25.1-1
unbound Ubuntu:24.04:LTS
- Versiones
- 1.17.1-2
- 1.18.0-2ubuntu1
- 1.18.0-2ubuntu2
- 1.19.1-1ubuntu1
- 1.19.2-1ubuntu1
- 1.19.2-1ubuntu3
- 1.19.2-1ubuntu3.1
- 1.19.2-1ubuntu3.2
- 1.19.2-1ubuntu3.3
- 1.19.2-1ubuntu3.4
- 1.19.2-1ubuntu3.5
- 1.19.2-1ubuntu3.6
- 1.19.2-1ubuntu3.7
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.19.2-1ubuntu3.8
Actualiza a 1.19.2-1ubuntu3.8
unbound Ubuntu:25.10
- Versiones
- 1.22.0-1ubuntu1
- 1.22.0-2ubuntu1
- 1.22.0-2ubuntu2
- 1.22.0-2ubuntu2.1
- 1.22.0-2ubuntu2.2
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.22.0-2ubuntu2.3
Actualiza a 1.22.0-2ubuntu2.3
unbound Ubuntu:26.04:LTS
- Versiones
- 1.22.0-2ubuntu2
- 1.22.0-2ubuntu4
- 1.24.2-1ubuntu1
- 1.24.2-1ubuntu2
- Intervalos de versiones afectados
- ECOSYSTEM: < 1.24.2-1ubuntu2.1
Actualiza a 1.24.2-1ubuntu2.1
Fuentes originales
- https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42944.txt
- https://access.redhat.com/security/cve/CVE-2026-42944
- https://bugzilla.redhat.com/show_bug.cgi?id=2479774
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42944.json
- https://access.redhat.com/errata/RHSA-2026:23231
- https://access.redhat.com/errata/RHSA-2026:24365
- https://access.redhat.com/errata/RHSA-2026:24369
- https://access.redhat.com/errata/RHSA-2026:19752
- https://nvd.nist.gov/vuln/detail/CVE-2026-42944