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CVE-2026-97206

7.5 high exploit Awaiting Analysis
NVD · CVE.org

NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.

Fix

Microsoft's update · Important

  • Release Notes — azl3 unbound 1.26.1-1 on Azure Linux 3.0 · build 1.26.2-1

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28.

Public exploits 1

Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 3

  1. StatusPublished → Awaiting AnalysisNVD modified 2026-10-22 15:22
  2. StatusReceived → PublishedNVD modified 2026-10-21 08:57
  3. First seenCVSS 7.5NVD modified 2026-10-21 09:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1