What is CVE-2026-44608?

CVE-2026-44608 is a medium-severity vulnerability in Nlnet Labs Unbound, classified under CWE-413. CVSS score: 5.9/10. Published 2026-05-20.

How severe is CVE-2026-44608?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Nlnet Labs Unbound

CVE-2026-44608

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a locking inconsistency vulnerability that when certain conditions are met (multi-threaded, RPZ XFR reload, RPZ zone with 'rpz-nsip'/'rpz-nsdname' triggers) it could result i…

EPSS: 0.001 (16.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nlnet Labs Unbound — versions 1.14.0
Nlnetlabs Unbound

Weakness classification (CWE)

CWE-413

References

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

Frequently asked questions

What is CVE-2026-44608?: CVE-2026-44608 is a medium-severity vulnerability in Nlnet Labs Unbound, classified under CWE-413. CVSS score: 5.9/10. Published 2026-05-20.
How severe is CVE-2026-44608?: Medium severity. CVSS v3 base score is 5.9 out of 10.