What is CVE-2026-41292?

CVE-2026-41292 is a high-severity vulnerability in Nlnet Labs Unbound, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-05-20.

How severe is CVE-2026-41292?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Nlnet Labs Unbound

CVE-2026-41292

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…

EPSS: 0.001 (22.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nlnet Labs Unbound — versions 0
Nlnetlabs Unbound

Weakness classification (CWE)

CWE-407 — Inefficient Algorithmic Complexity
CWE-770 — Allocation of Resources Without Limits or Throttling

References

sep@nlnetlabs.nl (vendor-advisory, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41292?: CVE-2026-41292 is a high-severity vulnerability in Nlnet Labs Unbound, classified under Inefficient Algorithmic Complexity. CVSS score: 7.5/10. Published 2026-05-20.
How severe is CVE-2026-41292?: High severity. CVSS v3 base score is 7.5 out of 10.