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  4. CVE 2026 97206 dns over quic doq path migration can lead to use
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Back to active CVEs
High · CVSS 7.5CVE-2026-97206

DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.CVE-2026-97206

Answer in brief

CVE-2026-97206 records a High severity (CVSS 7.5) vulnerability in DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.. The current sources do not mark it as known exploited. The current feed maps NLnet Labs/Unbound (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 21, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps NLnet Labs/Unbound (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
NLnet Labs/Unboundgeneric>=1.22.0 <1.26.21.26.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for NLnet Labs/Unbound.
  2. 2Review the reported fix. Source-reported solution: This issue is fixed starting with version 1.26.2

Evidence timeline and material changes

  1. Published upstream

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 21, 2026

Sources and claim methodology

  • Source referencenlnetlabs.nl
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Possible cache poisoning vulnerability via a cache side-channel exposed by 'unwanted-reply-threshold'Same nlnet labs/unbound package
  • Bypass of a configured island trust anchor underneath an insecure parent from an atacker-controlled NSEC record.Same nlnet labs/unbound package
  • Possible insecure NXDOMAIN for non-existing records under a configured island trust anchor underneath an insecure parent.Same nlnet labs/unbound package
  • Aggregate DNS name chained pointer decompression work leads to degradation of service.Same nlnet labs/unbound package

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416
Source
CVE List V5
Source checked
Oct 21, 2026
References
1 linked source
Open source record