CVE-2026-81642

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 5 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-81642.txt

Vendor Advisories for CVE-2026-81642(1)

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

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 70× in last 7d / 70× 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. 2026-09-21 07:55 UTCVendor advisory
  2. 2026-09-21 07:55 UTCGHSA enrichment
  3. 2026-09-21 04:13 UTCVendor advisory
  4. 2026-09-21 04:13 UTCGHSA enrichment
  5. 2026-09-21 00:31 UTCVendor advisory
  6. 2026-09-21 00:31 UTCGHSA enrichment
  7. 2026-09-20 20:49 UTCVendor advisory
  8. 2026-09-20 20:49 UTCGHSA enrichment
  9. 2026-09-20 17:07 UTCVendor advisory
  10. 2026-09-20 17:06 UTCGHSA enrichment
  11. 2026-09-20 13:24 UTCVendor advisory
  12. 2026-09-20 13:24 UTCGHSA enrichment
  13. 2026-09-20 09:43 UTCVendor advisory
  14. 2026-09-20 09:43 UTCGHSA enrichment
  15. 2026-09-20 06:01 UTCVendor advisory
  16. 2026-09-20 06:01 UTCGHSA enrichment
  17. 2026-09-20 02:19 UTCVendor advisory
  18. 2026-09-20 02:19 UTCGHSA enrichment
  19. 2026-09-19 22:37 UTCVendor advisory
  20. 2026-09-19 22:37 UTCGHSA enrichment
  21. 2026-09-19 18:54 UTCEG score recompute
  22. 2026-09-19 18:54 UTCVendor advisory
  23. 2026-09-19 18:54 UTCGHSA enrichment
  24. 2026-09-19 15:12 UTCVendor advisory
  25. 2026-09-19 15:12 UTCGHSA enrichment
Show 45 more
  1. 2026-09-19 11:30 UTCVendor advisory
  2. 2026-09-19 11:29 UTCGHSA enrichment
  3. 2026-09-19 07:45 UTCVendor advisory
  4. 2026-09-19 07:45 UTCGHSA enrichment
  5. 2026-09-19 04:02 UTCVendor advisory
  6. 2026-09-19 04:02 UTCGHSA enrichment
  7. 2026-09-19 00:20 UTCVendor advisory
  8. 2026-09-19 00:19 UTCGHSA enrichment
  9. 2026-09-18 20:38 UTCEG score recompute
  10. 2026-09-18 20:38 UTCVendor advisory
  11. 2026-09-18 20:38 UTCGHSA enrichment
  12. 2026-09-18 19:28 UTCEPSS rescore
  13. 2026-09-18 16:33 UTCVendor advisory
  14. 2026-09-18 16:33 UTCGHSA enrichment
  15. 2026-09-18 12:51 UTCVendor advisory
  16. 2026-09-18 12:51 UTCGHSA enrichment
  17. 2026-09-18 09:09 UTCVendor advisory
  18. 2026-09-18 09:09 UTCGHSA enrichment
  19. 2026-09-18 05:27 UTCVendor advisory
  20. 2026-09-18 05:27 UTCGHSA enrichment
  21. 2026-09-18 01:45 UTCVendor advisory
  22. 2026-09-18 01:45 UTCGHSA enrichment
  23. 2026-09-17 22:03 UTCEG score recompute
  24. 2026-09-17 22:03 UTCVendor advisory
  25. 2026-09-17 22:03 UTCGHSA enrichment
  26. 2026-09-17 18:21 UTCVendor advisory
  27. 2026-09-17 18:20 UTCGHSA enrichment
  28. 2026-09-17 14:17 UTCVendor advisory
  29. 2026-09-17 14:17 UTCGHSA enrichment
  30. 2026-09-17 10:34 UTCVendor advisory
  31. 2026-09-17 10:33 UTCGHSA enrichment
  32. 2026-09-17 06:51 UTCGHSA enrichment
  33. 2026-09-17 03:09 UTCGHSA enrichment
  34. 2026-09-16 23:27 UTCGHSA enrichment
  35. 2026-09-16 19:45 UTCGHSA enrichment
  36. 2026-09-16 19:07 UTCGHSA enrichment
  37. 2026-09-16 15:25 UTCEG score recompute
  38. 2026-09-16 15:25 UTCGHSA enrichment
  39. 2026-09-16 14:36 UTCEG score recompute
  40. 2026-09-16 14:36 UTCGHSA enrichment
  41. 2026-09-16 14:08 UTCEPSS rescore
  42. 2026-09-16 13:13 UTCGHSA enrichment
  43. 2026-09-16 09:30 UTCEG score recompute
  44. 2026-09-16 08:42 UTCEG score recompute
  45. 2026-09-16 08:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81642?
CVE-2026-81642 is a critical vulnerability published on September 16, 2026. In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote…
When was CVE-2026-81642 disclosed?
CVE-2026-81642 was first published in the National Vulnerability Database on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81642 actively exploited?
CVE-2026-81642 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 56.8% of all scored CVEs.
What is the CVSS score of CVE-2026-81642?
CVE-2026-81642 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-81642?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81642, 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

Explore the affected products and dependency analysis for CVE-2026-81642

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