CVE-2026-66141

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 99% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8EG
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 .forward privilege escalation because force_command for a pipe transport is mishandled.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
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-2026-66141(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 / 80× 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 164 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 11:13 UTCGHSA enrichment
  4. 2026-09-13 22:20 UTCEG score recompute
  5. 2026-09-13 22:20 UTCGHSA enrichment
  6. 2026-09-13 08:40 UTCGHSA enrichment
  7. 2026-09-12 19:46 UTCEG score recompute
  8. 2026-09-12 19:46 UTCGHSA enrichment
  9. 2026-09-12 06:52 UTCGHSA enrichment
  10. 2026-09-11 17:48 UTCEG score recompute
  11. 2026-09-11 17:48 UTCGHSA enrichment
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 09:37 UTCEPSS rescore
  14. 2026-09-11 03:58 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. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-06 08:43 UTCGHSA enrichment
  24. 2026-09-05 19:50 UTCEG score recompute
  25. 2026-09-05 19:50 UTCGHSA enrichment
Show 75 more
  1. 2026-09-05 15:31 UTCEPSS rescore
  2. 2026-09-05 06:56 UTCEG score recompute
  3. 2026-09-05 06:56 UTCGHSA enrichment
  4. 2026-09-04 12:56 UTCEG score recompute
  5. 2026-09-04 12:56 UTCGHSA enrichment
  6. 2026-09-04 05:07 UTCEPSS rescore
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 23:19 UTCEG score recompute
  9. 2026-09-01 23:19 UTCGHSA enrichment
  10. 2026-09-01 04:40 UTCEPSS rescore
  11. 2026-08-31 02:20 UTCEG score recompute
  12. 2026-08-31 02:20 UTCGHSA enrichment
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 13:26 UTCEG score recompute
  15. 2026-08-30 13:26 UTCGHSA enrichment
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-30 00:24 UTCEG score recompute
  18. 2026-08-30 00:24 UTCGHSA enrichment
  19. 2026-08-28 21:42 UTCEPSS rescore
  20. 2026-08-28 02:26 UTCEG score recompute
  21. 2026-08-28 02:26 UTCGHSA enrichment
  22. 2026-08-27 13:23 UTCGHSA enrichment
  23. 2026-08-27 00:29 UTCEG score recompute
  24. 2026-08-27 00:29 UTCGHSA enrichment
  25. 2026-08-26 14:47 UTCEPSS rescore
  26. 2026-08-26 11:30 UTCGHSA enrichment
  27. 2026-08-25 22:17 UTCGHSA enrichment
  28. 2026-08-25 08:45 UTCGHSA enrichment
  29. 2026-08-24 19:52 UTCEG score recompute
  30. 2026-08-24 19:51 UTCGHSA enrichment
  31. 2026-08-24 06:58 UTCGHSA enrichment
  32. 2026-08-23 18:03 UTCGHSA enrichment
  33. 2026-08-23 05:09 UTCEG score recompute
  34. 2026-08-23 05:09 UTCGHSA enrichment
  35. 2026-08-23 00:19 UTCEPSS rescore
  36. 2026-08-22 16:15 UTCGHSA enrichment
  37. 2026-08-22 03:21 UTCEG score recompute
  38. 2026-08-22 03:21 UTCGHSA enrichment
  39. 2026-08-21 23:49 UTCEPSS rescore
  40. 2026-08-21 14:26 UTCGHSA enrichment
  41. 2026-08-21 01:27 UTCEG score recompute
  42. 2026-08-21 01:27 UTCGHSA enrichment
  43. 2026-08-20 22:56 UTCEPSS rescore
  44. 2026-08-20 12:33 UTCGHSA enrichment
  45. 2026-08-19 23:40 UTCGHSA enrichment
  46. 2026-08-19 10:44 UTCGHSA enrichment
  47. 2026-08-18 21:46 UTCEG score recompute
  48. 2026-08-18 21:46 UTCGHSA enrichment
  49. 2026-08-18 13:48 UTCEPSS rescore
  50. 2026-08-18 08:51 UTCGHSA enrichment
  51. 2026-08-17 19:08 UTCEG score recompute▲ 0.40
  52. 2026-08-17 19:08 UTCGHSA enrichment
  53. 2026-08-17 19:07 UTCNVD updateCVSS v3 → 7.8
  54. 2026-08-17 13:47 UTCEPSS rescore
  55. 2026-08-17 10:40 UTCGHSA enrichment
  56. 2026-08-16 21:47 UTCEG score recompute
  57. 2026-08-16 21:47 UTCGHSA enrichment
  58. 2026-08-16 14:56 UTCEPSS rescore
  59. 2026-08-16 08:53 UTCEG score recompute
  60. 2026-08-16 08:53 UTCGHSA enrichment
  61. 2026-08-15 19:59 UTCGHSA enrichment
  62. 2026-08-15 07:05 UTCEG score recompute
  63. 2026-08-15 07:05 UTCGHSA enrichment
  64. 2026-08-15 01:30 UTCEPSS rescore
  65. 2026-08-14 17:51 UTCGHSA enrichment
  66. 2026-08-14 04:57 UTCEG score recompute
  67. 2026-08-14 04:57 UTCGHSA enrichment
  68. 2026-08-13 22:00 UTCEPSS rescore
  69. 2026-08-13 16:04 UTCGHSA enrichment
  70. 2026-08-13 03:06 UTCGHSA enrichment
  71. 2026-08-12 14:13 UTCEG score recompute
  72. 2026-08-12 14:13 UTCGHSA enrichment
  73. 2026-08-12 13:51 UTCEPSS rescore
  74. 2026-08-12 01:19 UTCEG score recompute
  75. 2026-08-12 01:19 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-66141?
CVE-2026-66141 is a high vulnerability published on July 24, 2026. Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.
When was CVE-2026-66141 disclosed?
CVE-2026-66141 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-2026-66141 actively exploited?
CVE-2026-66141 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 98.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66141?
CVE-2026-66141 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-66141?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66141, 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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