AZL-101721
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-101721.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-101721
- Upstream
- Published
- 2026-09-16T09:17:06Z
- Modified
- 2026-09-18T05:37:08Z
- Summary
- CVE-2026-81634 affecting package unbound 1.26.0-1
- Details
-
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.
- References