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CVE PROGRAM SOURCE RECORD6.6 Medium

CVE-2026-41292

Long list of incoming EDNS options degrades performance

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Status
Published
Published
Updated
Assigning organization
NLnet Labs

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).

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

NLnet Labs Unbound

Default version status: unaffected

  • 0 to < 1.25.1affected

References