What is CVE-2026-52863?

CVE-2026-52863 is a medium-severity vulnerability in Nlnet Labs Unbound, classified under Use After Free. CVSS score: 5.9/10. Published 2026-07-22.

How severe is CVE-2026-52863?

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

Use After Free in Nlnet Labs Unbound

CVE-2026-52863

In NLnet Labs Unbound 1.25.0 up to and including 1.25.1, a fix that makes the 'respip' and 'dns64' modules work together, creates a shallow copy of the view name in effect that could lead to memory corruption if the owner of the original v…

Vulnerability class: Use-After-Free

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 1.25.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

sep@nlnetlabs.nl (vendor-advisory)

Frequently asked questions

What is CVE-2026-52863?: CVE-2026-52863 is a medium-severity vulnerability in Nlnet Labs Unbound, classified under Use After Free. CVSS score: 5.9/10. Published 2026-07-22.
How severe is CVE-2026-52863?: Medium severity. CVSS v3 base score is 5.9 out of 10.