CVE-2026-66140

HIGHNVD 7.88.4▲
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-07-24. NVD baseline CVSS 7.8; sources differ by 0.6.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.

CVSS v3
7.8
EG Score
8.4(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 17, 2026

Advisory Details (1)

Auto-updated Jul 24, 2026
No patch confirmed yet.
generic

oss-security - security release for Exim

https://openwall.com/lists/oss-security/2026/07/22/9

Vendor Advisories for CVE-2026-66140(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
exim44.100~RC1-1 ... 4.99~RC3-2 (121 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
exim44.100-1 ... 4.99~RC3-2 (95 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
exim44.98.2-1, 4.98.2-1+deb13u1, 4.98.2-1+deb13u2, 4.98.2-1+deb13u34.98.2-1+deb13u4—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
exim44.98.2-1 ... 4.99~RC3-2 (34 versions)4.99.4-2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 87× 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 178 total refreshes for this CVE.

  1. 2026-09-15 09:44 UTCEG score recompute
  2. 2026-09-15 09:44 UTCGHSA enrichment
  3. 2026-09-14 11:08 UTCGHSA enrichment
  4. 2026-09-13 22:20 UTCEG score recompute
  5. 2026-09-13 22:20 UTCGHSA enrichment
  6. 2026-09-13 07:11 UTCGHSA enrichment
  7. 2026-09-12 18:23 UTCEG score recompute
  8. 2026-09-12 18:23 UTCGHSA enrichment
  9. 2026-09-12 05:30 UTCGHSA enrichment
  10. 2026-09-11 16:40 UTCEG score recompute
  11. 2026-09-11 16:40 UTCGHSA enrichment
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 09:37 UTCEPSS rescore
  14. 2026-09-11 03:45 UTCGHSA enrichment
  15. 2026-09-10 14:56 UTCEG score recompute
  16. 2026-09-10 14:56 UTCGHSA enrichment
  17. 2026-09-09 08:52 UTCEG score recompute
  18. 2026-09-09 08:52 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-07 21:27 UTCEG score recompute
  21. 2026-09-07 21:27 UTCGHSA enrichment
  22. 2026-09-07 16:01 UTCEPSS rescore
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-06 08:34 UTCGHSA enrichment
  25. 2026-09-05 19:44 UTCEG score recompute
Show 75 more
  1. 2026-09-05 19:44 UTCGHSA enrichment
  2. 2026-09-05 15:31 UTCEPSS rescore
  3. 2026-09-05 06:56 UTCEG score recompute
  4. 2026-09-05 06:56 UTCGHSA enrichment
  5. 2026-09-04 12:56 UTCEG score recompute
  6. 2026-09-04 12:56 UTCGHSA enrichment
  7. 2026-09-04 05:07 UTCEPSS rescore
  8. 2026-09-02 14:12 UTCEPSS rescore
  9. 2026-09-01 23:19 UTCEG score recompute
  10. 2026-09-01 23:19 UTCGHSA enrichment
  11. 2026-09-01 13:54 UTCEPSS rescore
  12. 2026-09-01 04:40 UTCEPSS rescore
  13. 2026-08-31 02:01 UTCEG score recompute
  14. 2026-08-31 02:01 UTCGHSA enrichment
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 13:13 UTCEG score recompute
  17. 2026-08-30 13:13 UTCGHSA enrichment
  18. 2026-08-30 01:22 UTCEPSS rescore
  19. 2026-08-30 00:25 UTCEG score recompute
  20. 2026-08-30 00:24 UTCGHSA enrichment
  21. 2026-08-28 21:42 UTCEPSS rescore
  22. 2026-08-27 23:06 UTCEG score recompute
  23. 2026-08-27 23:06 UTCGHSA enrichment
  24. 2026-08-27 10:17 UTCGHSA enrichment
  25. 2026-08-26 21:28 UTCEG score recompute
  26. 2026-08-26 21:28 UTCGHSA enrichment
  27. 2026-08-26 14:47 UTCEPSS rescore
  28. 2026-08-26 08:40 UTCGHSA enrichment
  29. 2026-08-25 19:45 UTCEG score recompute
  30. 2026-08-25 19:45 UTCGHSA enrichment
  31. 2026-08-25 13:49 UTCEPSS rescore
  32. 2026-08-25 06:56 UTCGHSA enrichment
  33. 2026-08-24 18:07 UTCEG score recompute
  34. 2026-08-24 18:07 UTCGHSA enrichment
  35. 2026-08-24 05:05 UTCGHSA enrichment
  36. 2026-08-23 16:16 UTCEG score recompute
  37. 2026-08-23 16:16 UTCGHSA enrichment
  38. 2026-08-23 03:21 UTCEG score recompute
  39. 2026-08-23 03:21 UTCGHSA enrichment
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-22 14:33 UTCGHSA enrichment
  42. 2026-08-22 01:45 UTCEG score recompute
  43. 2026-08-22 01:45 UTCGHSA enrichment
  44. 2026-08-21 23:49 UTCEPSS rescore
  45. 2026-08-21 12:56 UTCGHSA enrichment
  46. 2026-08-21 00:07 UTCEG score recompute
  47. 2026-08-21 00:07 UTCGHSA enrichment
  48. 2026-08-20 22:56 UTCEPSS rescore
  49. 2026-08-20 11:19 UTCGHSA enrichment
  50. 2026-08-19 22:31 UTCEG score recompute
  51. 2026-08-19 22:31 UTCGHSA enrichment
  52. 2026-08-19 17:04 UTCEPSS rescore
  53. 2026-08-19 09:43 UTCGHSA enrichment
  54. 2026-08-18 20:46 UTCEG score recompute
  55. 2026-08-18 20:46 UTCGHSA enrichment
  56. 2026-08-18 13:48 UTCEPSS rescore
  57. 2026-08-18 07:58 UTCGHSA enrichment
  58. 2026-08-17 19:08 UTCEG score recompute
  59. 2026-08-17 19:08 UTCGHSA enrichment
  60. 2026-08-17 19:07 UTCNVD updateCVSS v3 → 7.8
  61. 2026-08-17 13:47 UTCEPSS rescore
  62. 2026-08-17 05:48 UTCGHSA enrichment
  63. 2026-08-16 16:42 UTCEG score recompute
  64. 2026-08-16 16:42 UTCGHSA enrichment
  65. 2026-08-16 14:56 UTCEPSS rescore
  66. 2026-08-16 03:54 UTCEG score recompute
  67. 2026-08-16 03:54 UTCGHSA enrichment
  68. 2026-08-15 15:06 UTCGHSA enrichment
  69. 2026-08-15 02:17 UTCEG score recompute
  70. 2026-08-15 02:17 UTCGHSA enrichment
  71. 2026-08-15 01:30 UTCEPSS rescore
  72. 2026-08-14 13:29 UTCGHSA enrichment
  73. 2026-08-14 00:39 UTCEG score recompute
  74. 2026-08-14 00:39 UTCGHSA enrichment
  75. 2026-08-13 22:00 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-66140?
CVE-2026-66140 is a high vulnerability published on July 24, 2026. Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.
When was CVE-2026-66140 disclosed?
CVE-2026-66140 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66140 actively exploited?
CVE-2026-66140 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 82.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66140?
CVE-2026-66140 has a CVSS v3 base score of 7.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.4.
How do I remediate CVE-2026-66140?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66140, 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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