CVE-2026-42944
Gravedad CVSS v4.0:
ALTA
Tipo:
No Disponible / Otro tipo
Fecha de publicación:
20/05/2026
Última modificación:
20/05/2026
Descripción
*** Pendiente de traducción *** 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.
Impacto
Puntuación base 4.0
8.70
Gravedad 4.0
ALTA
Puntuación base 3.x
7.50
Gravedad 3.x
ALTA
Productos y versiones vulnerables
| CPE | Desde | Hasta |
|---|---|---|
| cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* | 1.14.0 (incluyendo) | 1.25.1 (excluyendo) |
Para consultar la lista completa de nombres de CPE con productos y versiones, ver esta página