CVE-2026-19666

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 17, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

Index of /isc/bind9/9.21.26

https://downloads.isc.org/isc/bind9/9.21.26
generic

Index of /isc/bind9/9.20.29

https://downloads.isc.org/isc/bind9/9.20.29
generic

CVE-2026-19666: Use-after-free in query_addnoqnameproof() via the DNS64 filter64 path

https://kb.isc.org/docs/cve-2026-19666

Vendor Advisories for CVE-2026-19666(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatbind-main-9.20.29-0.1.hum12026-09-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 28× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 09:16 UTCVendor advisory
  2. 2026-09-25 09:16 UTCGHSA enrichment
  3. 2026-09-24 20:13 UTCEG score recompute
  4. 2026-09-24 20:13 UTCVendor advisory
  5. 2026-09-24 20:13 UTCGHSA enrichment
  6. 2026-09-24 07:10 UTCVendor advisory
  7. 2026-09-24 07:10 UTCGHSA enrichment
  8. 2026-09-23 18:07 UTCEG score recompute
  9. 2026-09-23 18:07 UTCVendor advisory
  10. 2026-09-23 18:07 UTCGHSA enrichment
  11. 2026-09-23 05:05 UTCVendor advisory
  12. 2026-09-23 05:05 UTCGHSA enrichment
  13. 2026-09-22 16:02 UTCEG score recompute
  14. 2026-09-22 16:02 UTCVendor advisory
  15. 2026-09-22 16:02 UTCGHSA enrichment
  16. 2026-09-22 02:59 UTCEG score recompute
  17. 2026-09-22 02:59 UTCVendor advisory
  18. 2026-09-22 02:59 UTCGHSA enrichment
  19. 2026-09-21 13:56 UTCVendor advisory
  20. 2026-09-21 13:56 UTCGHSA enrichment
  21. 2026-09-21 00:53 UTCGHSA enrichment
  22. 2026-09-20 11:49 UTCGHSA enrichment
  23. 2026-09-19 22:44 UTCEG score recompute
  24. 2026-09-19 22:44 UTCGHSA enrichment
  25. 2026-09-19 09:42 UTCGHSA enrichment
Show 15 more
  1. 2026-09-18 20:37 UTCEG score recompute
  2. 2026-09-18 20:37 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 07:29 UTCEG score recompute
  5. 2026-09-18 07:29 UTCGHSA enrichment
  6. 2026-09-17 18:26 UTCEG score recompute
  7. 2026-09-17 18:26 UTCGHSA enrichment
  8. 2026-09-17 18:00 UTCEG score recompute
  9. 2026-09-17 18:00 UTCGHSA enrichment
  10. 2026-09-17 08:35 UTCGHSA enrichment
  11. 2026-09-16 19:32 UTCEG score recompute
  12. 2026-09-16 19:32 UTCGHSA enrichment
  13. 2026-09-16 15:21 UTCEG score recompute
  14. 2026-09-16 14:26 UTCEG score recompute
  15. 2026-09-16 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-19666?
CVE-2026-19666 is a high vulnerability published on September 16, 2026. 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…
When was CVE-2026-19666 disclosed?
CVE-2026-19666 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19666 actively exploited?
CVE-2026-19666 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.3% of all scored CVEs.
What is the CVSS score of CVE-2026-19666?
CVE-2026-19666 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-19666?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19666, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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