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CVE-2026-97206

DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.

HIGH
7.5
CVSS Score
Published: October 21, 2026 at 08:57 AM UTC
Updated: October 22, 2026 at 03:22 PM UTC
1 product affected across 1 vendorUnbound

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Severity
HIGH7.5
Exploit prediction
EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt

CVSS

7.5HIGHNLnet Labs
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-416

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