CVE-2026-40208

LOWPre-NVD 3.73.7—
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory (severity: LOW) published 2026-06-25. a secondary CVSS source baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.7Exploit: None knownExposed: 0

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

An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

CVSS v3
3.7
EG Score
3.7(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: 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
Severity37% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 25, 2026

References (1)

Vendor Advisories for CVE-2026-40208(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
dnsdist1.5.1-3 ... 2.1.0-2 (44 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
dnsdist1.7.3-2 ... 2.1.0-2 (35 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dnsdist1.9.10-1, 1.9.10-1+deb13u1, 1.9.14-0+deb13u11.9.15-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dnsdist1.9.10-1 ... 2.0.6-1 (18 versions)2.1.0-1—

Weakness Classification(1)

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

Data Freshness Timeline

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

Frequently asked(5)

What is CVE-2026-40208?
CVE-2026-40208 is a low vulnerability published on June 25, 2026. An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.
When was CVE-2026-40208 disclosed?
CVE-2026-40208 was first published in the National Vulnerability Database on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40208 actively exploited?
CVE-2026-40208 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 89.7% of all scored CVEs.
What is the CVSS score of CVE-2026-40208?
CVE-2026-40208 has a CVSS v3 base score of 3.7 (NVD).
How do I remediate CVE-2026-40208?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40208, 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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