CVE-2026-40210

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreMEDIUM confidence

Score 4.8 from GitHub Security Advisory published 2026-06-25. a secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.8Exploit: None knownExposed: 0

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

An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.

CVSS v3
4.8
EG Score
4.8(medium)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity48% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 27, 2026
No patch confirmed yet.
generic

PowerDNS Security Advisory 2026-09 for DNSdist: Multiple issues - dnsdist documentation

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

Vendor Advisories for CVE-2026-40210(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 15× in last 7d / 77× 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 141 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40210?
CVE-2026-40210 is a medium vulnerability published on June 25, 2026. An out-of-bounds read might happen when SetMacAddrAction is used, potentially resulting in uninitialized memory being sent over the network or a crash.
When was CVE-2026-40210 disclosed?
CVE-2026-40210 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-2026-40210 actively exploited?
CVE-2026-40210 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 82.5% of all scored CVEs.
What is the CVSS score of CVE-2026-40210?
CVE-2026-40210 has a CVSS v3 base score of 4.8 (NVD).
How do I remediate CVE-2026-40210?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40210, 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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