CVE-2026-19401

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM 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: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 26, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 26, 2026
Patch available.
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 rangeFix by version rangeDependents
nsd4.10.1-1 ... 4.9.1-1 (25 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nsd4.12.0-1 ... 4.15.2-1 (16 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nsd4.12.0-1 ... 4.15.0~rc1-1 (14 versions)
  • every version up to 4.15.1-1: fixed in 4.15.1-1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 101× 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.

Showing the most recent 100 of 150 total refreshes for this CVE.

  1. 2026-10-10 19:59 UTCEPSS rescore
  2. 2026-10-10 06:51 UTCEG score recompute
  3. 2026-10-10 06:51 UTCGHSA enrichment
  4. 2026-10-09 20:06 UTCEPSS rescore
  5. 2026-10-09 03:30 UTCEG score recompute
  6. 2026-10-09 03:29 UTCGHSA enrichment
  7. 2026-10-08 17:11 UTCEPSS rescore
  8. 2026-10-08 02:02 UTCEG score recompute
  9. 2026-10-08 02:02 UTCGHSA enrichment
  10. 2026-10-07 23:47 UTCEPSS rescore
  11. 2026-10-07 09:55 UTCGHSA enrichment
  12. 2026-10-06 21:11 UTCEG score recompute
  13. 2026-10-06 21:11 UTCGHSA enrichment
  14. 2026-10-06 15:17 UTCEPSS rescore
  15. 2026-10-06 08:50 UTCGHSA enrichment
  16. 2026-10-05 20:30 UTCEG score recompute
  17. 2026-10-05 20:29 UTCGHSA enrichment
  18. 2026-10-05 17:42 UTCEPSS rescore
  19. 2026-10-05 08:04 UTCEG score recompute
  20. 2026-10-05 08:04 UTCGHSA enrichment
  21. 2026-10-04 23:21 UTCEPSS rescore
  22. 2026-10-04 19:43 UTCGHSA enrichment
  23. 2026-10-04 04:35 UTCGHSA enrichment
  24. 2026-10-03 16:13 UTCEG score recompute
  25. 2026-10-03 16:13 UTCGHSA enrichment
Show 75 more
  1. 2026-10-02 21:31 UTCEG score recompute
  2. 2026-10-02 21:31 UTCGHSA enrichment
  3. 2026-10-02 09:08 UTCEG score recompute
  4. 2026-10-02 09:08 UTCGHSA enrichment
  5. 2026-10-01 20:48 UTCEG score recompute
  6. 2026-10-01 20:47 UTCGHSA enrichment
  7. 2026-10-01 19:49 UTCEPSS rescore
  8. 2026-10-01 08:24 UTCGHSA enrichment
  9. 2026-09-30 20:00 UTCEG score recompute
  10. 2026-09-30 20:00 UTCGHSA enrichment
  11. 2026-09-30 15:02 UTCEPSS rescore
  12. 2026-09-30 06:12 UTCEG score recompute
  13. 2026-09-30 06:12 UTCGHSA enrichment
  14. 2026-09-29 15:20 UTCEPSS rescore
  15. 2026-09-29 12:35 UTCGHSA enrichment
  16. 2026-09-28 23:14 UTCEG score recompute
  17. 2026-09-28 23:14 UTCGHSA enrichment
  18. 2026-09-28 13:51 UTCEPSS rescore
  19. 2026-09-28 10:45 UTCGHSA enrichment
  20. 2026-09-27 22:16 UTCEG score recompute
  21. 2026-09-27 22:16 UTCGHSA enrichment
  22. 2026-09-27 13:47 UTCEPSS rescore
  23. 2026-09-27 09:34 UTCGHSA enrichment
  24. 2026-09-26 21:13 UTCEG score recompute
  25. 2026-09-26 21:13 UTCGHSA enrichment
  26. 2026-09-26 15:58 UTCEPSS rescore
  27. 2026-09-25 15:49 UTCGHSA enrichment
  28. 2026-09-25 03:16 UTCGHSA enrichment
  29. 2026-09-24 14:37 UTCEG score recompute
  30. 2026-09-24 14:37 UTCGHSA enrichment
  31. 2026-09-24 01:35 UTCEG score recompute
  32. 2026-09-24 01:35 UTCGHSA enrichment
  33. 2026-09-23 13:14 UTCGHSA enrichment
  34. 2026-09-23 00:53 UTCEG score recompute
  35. 2026-09-23 00:53 UTCGHSA enrichment
  36. 2026-09-22 12:32 UTCGHSA enrichment
  37. 2026-09-22 00:12 UTCEG score recompute
  38. 2026-09-22 00:12 UTCGHSA enrichment
  39. 2026-09-21 11:46 UTCGHSA enrichment
  40. 2026-09-20 23:24 UTCEG score recompute
  41. 2026-09-20 23:24 UTCGHSA enrichment
  42. 2026-09-20 10:47 UTCGHSA enrichment
  43. 2026-09-19 22:26 UTCEG score recompute
  44. 2026-09-19 22:26 UTCGHSA enrichment
  45. 2026-09-19 10:04 UTCGHSA enrichment
  46. 2026-09-18 21:42 UTCEG score recompute
  47. 2026-09-18 21:42 UTCGHSA enrichment
  48. 2026-09-18 19:27 UTCEPSS rescore
  49. 2026-09-18 09:20 UTCGHSA enrichment
  50. 2026-09-17 20:59 UTCEG score recompute
  51. 2026-09-17 20:59 UTCGHSA enrichment
  52. 2026-09-17 07:32 UTCGHSA enrichment
  53. 2026-09-16 19:09 UTCEG score recompute
  54. 2026-09-16 19:09 UTCGHSA enrichment
  55. 2026-09-16 14:07 UTCEPSS rescore
  56. 2026-09-16 05:14 UTCEPSS rescore
  57. 2026-09-16 04:34 UTCGHSA enrichment
  58. 2026-09-15 16:06 UTCGHSA enrichment
  59. 2026-09-15 03:45 UTCEG score recompute
  60. 2026-09-15 03:45 UTCGHSA enrichment
  61. 2026-09-14 15:24 UTCGHSA enrichment
  62. 2026-09-14 03:02 UTCEG score recompute
  63. 2026-09-14 03:02 UTCGHSA enrichment
  64. 2026-09-13 16:46 UTCEPSS rescore
  65. 2026-09-13 14:41 UTCGHSA enrichment
  66. 2026-09-13 02:16 UTCEG score recompute
  67. 2026-09-13 02:16 UTCGHSA enrichment
  68. 2026-09-12 15:00 UTCEPSS rescore
  69. 2026-09-12 13:55 UTCGHSA enrichment
  70. 2026-09-12 01:34 UTCEG score recompute
  71. 2026-09-12 01:34 UTCGHSA enrichment
  72. 2026-09-11 14:52 UTCEPSS rescore
  73. 2026-09-11 13:12 UTCEG score recompute
  74. 2026-09-11 13:12 UTCGHSA enrichment
  75. 2026-09-11 09:36 UTCEPSS rescore

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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 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 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-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?
A fix for CVE-2026-19401 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19401 are linked in the Vendor Advisories panel on this page.

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