VULNERABILITY INTELLIGENCE

CVE-2026-41292

CVSS score7.5 HIGH
EPSS probability0.75%
CISA KEVNot currently listed
Published2026-05-20
Last modified2026-08-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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).

Weakness classification

  • sep@nlnetlabs.nl: CWE-407
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-1050

Primary references