CVE-2026-81634
7.5 HIGHPublished 2026-09-16 · Updated 2026-09-16
AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.
NVD 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
Weaknesses
CWE-122
References
Data: NVD (public domain). Analysis: local $0 model. Defensive use only.