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  4. CVE 2026 19666 use after free in queryaddnoqnameproof via the
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Back to active CVEs
High · CVSS 7.5CVE-2026-19666

Use-after-free in query_addnoqnameproof() via the DNS64 filter64 pathCVE-2026-19666

Answer in brief

CVE-2026-19666 records a High severity (CVSS 7.5) vulnerability in Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path. The current sources do not mark it as known exploited. The current feed maps ISC/BIND 9 (generic), ISC/BIND 9 (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 Sep 16, 2026Updated Oct 26, 2026Source checked Oct 31, 2026First seen by HOL Sep 16, 2026Material review Oct 26, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

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 ISC/BIND 9 (generic), ISC/BIND 9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ISC/BIND 9generic>=9.11.0 <=9.18.50 || >=9.20.0 <=9.20.27 || >=9.21.0 <=9.21.25 || >=9.11.3-S1 <=9.18.50-S1 || >=9.20.9-S1 <=9.20.27-S1Not reported
ISC/BIND 9generic9.11.0 || 9.20.0 || 9.21.0 || 9.11.3-S1 || 9.20.9-S1Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ISC/BIND 9, ISC/BIND 9.
  2. 2Review the reported fix. Source-reported solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29, 9.21.26, or 9.20.29-S1.

Evidence timeline and material changes

  1. Published upstream

    Sep 16, 2026

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

  2. Source modified

    Oct 26, 2026

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

  3. First seen by HOL

    Sep 16, 2026

Sources and claim methodology

  • Source referencedownloads.isc.org
  • Source referencedownloads.isc.org
  • Source referencekb.isc.org
Upstream source description

On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416
Source
CVE List V5
Source checked
Oct 31, 2026
References
3 linked sources
Open source record