CVE-2026-19401

HIGHNVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-01. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 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: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when positioned sufficiently close, deny all DNS service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

August 26, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 26, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19401.txt

Vendor Advisories for CVE-2026-19401(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nsd4.10.1-1 ... 4.9.1-1 (24 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nsd4.12.0-1 ... 4.15.1-1 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nsd4.12.0-1 ... 4.15.0~rc1-1 (14 versions)4.15.1-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 83× 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. 2026-09-19 22:26 UTCEG score recompute
  2. 2026-09-19 22:26 UTCGHSA enrichment
  3. 2026-09-19 10:04 UTCGHSA enrichment
  4. 2026-09-18 21:42 UTCEG score recompute
  5. 2026-09-18 21:42 UTCGHSA enrichment
  6. 2026-09-18 19:27 UTCEPSS rescore
  7. 2026-09-18 09:20 UTCGHSA enrichment
  8. 2026-09-17 20:59 UTCEG score recompute
  9. 2026-09-17 20:59 UTCGHSA enrichment
  10. 2026-09-17 07:32 UTCGHSA enrichment
  11. 2026-09-16 19:09 UTCEG score recompute
  12. 2026-09-16 19:09 UTCGHSA enrichment
  13. 2026-09-16 14:07 UTCEPSS rescore
  14. 2026-09-16 05:14 UTCEPSS rescore
  15. 2026-09-16 04:34 UTCGHSA enrichment
  16. 2026-09-15 16:06 UTCGHSA enrichment
  17. 2026-09-15 03:45 UTCEG score recompute
  18. 2026-09-15 03:45 UTCGHSA enrichment
  19. 2026-09-14 15:24 UTCGHSA enrichment
  20. 2026-09-14 03:02 UTCEG score recompute
  21. 2026-09-14 03:02 UTCGHSA enrichment
  22. 2026-09-13 16:46 UTCEPSS rescore
  23. 2026-09-13 14:41 UTCGHSA enrichment
  24. 2026-09-13 02:16 UTCEG score recompute
  25. 2026-09-13 02:16 UTCGHSA enrichment
Show 58 more
  1. 2026-09-12 15:00 UTCEPSS rescore
  2. 2026-09-12 13:55 UTCGHSA enrichment
  3. 2026-09-12 01:34 UTCEG score recompute
  4. 2026-09-12 01:34 UTCGHSA enrichment
  5. 2026-09-11 14:52 UTCEPSS rescore
  6. 2026-09-11 13:12 UTCEG score recompute
  7. 2026-09-11 13:12 UTCGHSA enrichment
  8. 2026-09-11 09:36 UTCEPSS rescore
  9. 2026-09-11 00:51 UTCGHSA enrichment
  10. 2026-09-10 12:30 UTCEG score recompute
  11. 2026-09-10 12:30 UTCGHSA enrichment
  12. 2026-09-10 09:34 UTCEPSS rescore
  13. 2026-09-10 00:06 UTCGHSA enrichment
  14. 2026-09-09 08:41 UTCEG score recompute
  15. 2026-09-09 08:41 UTCGHSA enrichment
  16. 2026-09-08 22:00 UTCEPSS rescore
  17. 2026-09-08 20:20 UTCEG score recompute▼ 0.70
  18. 2026-09-08 20:20 UTCGHSA enrichment
  19. 2026-09-08 20:10 UTCNVD updateCVSS v3 → 7.5
  20. 2026-09-08 03:33 UTCEG score recompute
  21. 2026-09-08 03:33 UTCGHSA enrichment
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-07 15:12 UTCGHSA enrichment
  24. 2026-09-07 01:05 UTCEG score recompute
  25. 2026-09-07 01:05 UTCGHSA enrichment
  26. 2026-09-06 13:47 UTCEPSS rescore
  27. 2026-09-06 12:43 UTCGHSA enrichment
  28. 2026-09-06 00:22 UTCEG score recompute
  29. 2026-09-06 00:22 UTCGHSA enrichment
  30. 2026-09-05 11:58 UTCGHSA enrichment
  31. 2026-09-04 23:36 UTCEG score recompute
  32. 2026-09-04 23:36 UTCGHSA enrichment
  33. 2026-09-04 11:07 UTCEG score recompute
  34. 2026-09-04 11:07 UTCGHSA enrichment
  35. 2026-09-04 05:06 UTCEPSS rescore
  36. 2026-09-03 22:46 UTCGHSA enrichment
  37. 2026-09-03 10:17 UTCGHSA enrichment
  38. 2026-09-02 21:54 UTCEG score recompute
  39. 2026-09-02 21:54 UTCGHSA enrichment
  40. 2026-09-02 14:11 UTCEPSS rescore
  41. 2026-09-02 09:32 UTCGHSA enrichment
  42. 2026-09-01 20:30 UTCEG score recompute
  43. 2026-09-01 13:53 UTCEPSS rescore
  44. 2026-09-01 08:09 UTCEG score recompute
  45. 2026-09-01 04:39 UTCEPSS rescore
  46. 2026-08-31 07:22 UTCEG score recompute
  47. 2026-08-30 19:17 UTCEPSS rescore
  48. 2026-08-30 06:37 UTCEG score recompute
  49. 2026-08-30 01:22 UTCEPSS rescore
  50. 2026-08-29 05:49 UTCEG score recompute
  51. 2026-08-28 21:41 UTCEPSS rescore
  52. 2026-08-27 16:37 UTCEG score recompute
  53. 2026-08-27 14:25 UTCEPSS rescore
  54. 2026-08-26 15:54 UTCEG score recompute
  55. 2026-08-26 14:46 UTCEPSS rescore
  56. 2026-08-26 14:23 UTCEG score recompute
  57. 2026-08-26 08:49 UTCEG score recompute
  58. 2026-08-26 08:48 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-19401?
CVE-2026-19401 is a high vulnerability published on August 26, 2026. Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when…
When was CVE-2026-19401 disclosed?
CVE-2026-19401 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19401 actively exploited?
CVE-2026-19401 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 70.5% of all scored CVEs.
What is the CVSS score of CVE-2026-19401?
CVE-2026-19401 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-19401?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19401, 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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