CVE-2026-81634

HIGH7.5

Published 2026-09-16 · Source sep@nlnetlabs.nl

Description

In NLnet Labs Unbound up to and including 1.26.0, a 255 length query name with a large TCP response can lead to a heap buffer overflow during the RRSet canonicalisation routine. This is caused by missing to add the first owner name into the buffer length check. A malicious actor operating a malicious name server or tampering with an incoming response to Unbound (canonicalisation happens before DNSSEC validation), can trigger the vulnerability.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-122

References

https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81634.txt

View on NVD

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