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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).
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Title: Unbound de NLnet Labs, Description: NLnet Labs Unbound hasta e incluyendo la versión 1.25.0 es vulnerable a un ataque de degradación de servicio relacionado con el análisis de largas listas de opciones EDNS entrantes. Un adversario que envíe consultas con demasiadas opciones EDNS puede mantener los hilos de Unbound como rehenes mientras estos analizan y crean estructuras de datos internas para las opciones. Los ataques coordinados pueden resultar en degradación y/o denegación de servicio. Unbound 1.25.1 contiene un parche con una solución para limitar las opciones EDNS entrantes aceptables (100).
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CVE Modified by redhat-SADP7/14/2026 10:21:15 PM
Action
Type
Old Value
New Value
Changed
Affected
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New CVE Received from NLnet Labs5/20/2026 6:16:27 AM
Action
Type
Old Value
New Value
Added
Description
NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
