CVE-2026-97206
DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.
- State
- Published
- Severity
- 7.5 High
- Published
- Oct 21, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 14, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | NLnet Labs |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
UnboundNLnet Labs |
|
References
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