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7.5highHigh

CVE-2026-41292

Nlnetlabs Unbound

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).

Exploitation status

  • A vendor advisory or patch reference has been published.

What the metrics mean

  • It is reachable over a network, without needing local access.
  • For an attacker who can reach it, no special conditions are needed to exploit it.
  • To exploit it, no account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
7.5 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4
6.6
Weakness
CWE-407
Assigned by
sep@nlnetlabs.nl

Dates

Published
2026-05-20
Last modified
2026-08-26
Sources
NVD

Affected products

  • Nlnetlabs Unbound- 1.25.1

As listed in the NVD configuration data. Not a statement about your estate.

References