CVE-2026-94184

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A stack-based buffer overflow flaw was found in fetchmail when built with NTLM support. A malicious or compromised mail server advertising NTLM authentication can send a crafted Type 2 challenge that causes fetchmail to write past a fixed stack buffer while building the NTLM authenticate response. This may lead to remote code execution depending on stack-frame layout, or to authentication failure or process termination under memory hardening.

CVSS v3
8.1
EG Score
8.1HIGHhigh confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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

September 21, 2026

Last Modified

October 1, 2026

Advisory Details (5)

Auto-updated Sep 21, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic🟡 PoC Available

oss-security - fetchmail's NTLM authentication vulnerable to stack buffer overflow up to release 6.6.6 (FW: The 6.6.7.rc1 release candidate is available (security fix for NTLM protocol, possible RCE))

https://www.openwall.com/lists/oss-security/2026/06/27/8
generic
https://www.fetchmail.info/fetchmail-SA-2026-01.txt
generic

SMB/NTLM: check remaining buffer capacity before memcpy (cb5be5c3) · Commits · fetchmail / fetchmail · GitLab

https://gitlab.com/fetchmail/fetchmail/-/commit/cb5be5c38471eec19e519ace0bc569176317ea92
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2537395
redhat Patch Available

CVE-2026-94184 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-94184

Vendor Advisories for CVE-2026-94184(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 38× in last 7d / 79× 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. 2026-10-04 06:59 UTCGHSA enrichment
  2. 2026-10-03 18:55 UTCEG score recompute
  3. 2026-10-03 18:55 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-03 06:50 UTCGHSA enrichment
  6. 2026-10-02 18:46 UTCEG score recompute
  7. 2026-10-02 18:45 UTCGHSA enrichment
  8. 2026-10-02 17:57 UTCEPSS rescore
  9. 2026-10-02 06:39 UTCEG score recompute
  10. 2026-10-02 06:38 UTCGHSA enrichment
  11. 2026-10-01 19:51 UTCEPSS rescore
  12. 2026-10-01 18:30 UTCEG score recompute
  13. 2026-10-01 18:30 UTCGHSA enrichment
  14. 2026-10-01 18:29 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  15. 2026-10-01 17:21 UTCEG score recompute
  16. 2026-10-01 17:21 UTCGHSA enrichment
  17. 2026-10-01 17:20 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  18. 2026-10-01 08:46 UTCGHSA enrichment
  19. 2026-09-30 20:41 UTCEG score recompute
  20. 2026-09-30 20:41 UTCGHSA enrichment
  21. 2026-09-30 15:04 UTCEPSS rescore
  22. 2026-09-30 08:37 UTCGHSA enrichment
  23. 2026-09-29 20:32 UTCEG score recompute
  24. 2026-09-29 20:32 UTCGHSA enrichment
  25. 2026-09-29 19:38 UTCEG score recompute
Show 54 more
  1. 2026-09-29 19:38 UTCGHSA enrichment
  2. 2026-09-29 15:50 UTCEG score recompute
  3. 2026-09-29 15:50 UTCGHSA enrichment
  4. 2026-09-29 03:41 UTCEG score recompute
  5. 2026-09-29 03:41 UTCGHSA enrichment
  6. 2026-09-28 15:36 UTCEG score recompute
  7. 2026-09-28 15:36 UTCGHSA enrichment
  8. 2026-09-28 13:52 UTCEPSS rescore
  9. 2026-09-28 13:52 UTCEPSS rescore
  10. 2026-09-28 03:30 UTCGHSA enrichment
  11. 2026-09-27 15:26 UTCEG score recompute
  12. 2026-09-27 15:26 UTCGHSA enrichment
  13. 2026-09-27 13:49 UTCEPSS rescore
  14. 2026-09-27 03:21 UTCEG score recompute
  15. 2026-09-27 03:21 UTCGHSA enrichment
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-26 15:16 UTCGHSA enrichment
  18. 2026-09-26 03:12 UTCEG score recompute
  19. 2026-09-26 03:11 UTCGHSA enrichment
  20. 2026-09-25 15:06 UTCGHSA enrichment
  21. 2026-09-25 02:57 UTCGHSA enrichment
  22. 2026-09-24 14:51 UTCEG score recompute
  23. 2026-09-24 14:51 UTCGHSA enrichment
  24. 2026-09-24 14:04 UTCEPSS rescore
  25. 2026-09-24 07:35 UTCGHSA enrichment
  26. 2026-09-23 19:30 UTCGHSA enrichment
  27. 2026-09-23 18:50 UTCEG score recompute
  28. 2026-09-23 18:50 UTCGHSA enrichment
  29. 2026-09-23 18:49 UTCMITRE cvelistV5CVSS v3 → 8.1 · severity → HIGH
  30. 2026-09-23 17:54 UTCEPSS rescore
  31. 2026-09-23 15:22 UTCGHSA enrichment
  32. 2026-09-23 03:27 UTCNVD update
  33. 2026-09-23 03:18 UTCGHSA enrichment
  34. 2026-09-23 03:17 UTCMITRE cvelistV5
  35. 2026-09-22 20:32 UTCGHSA enrichment
  36. 2026-09-22 20:32 UTCNVD update
  37. 2026-09-22 20:03 UTCEG score recompute
  38. 2026-09-22 20:03 UTCGHSA enrichment
  39. 2026-09-22 20:02 UTCMITRE cvelistV5
  40. 2026-09-22 19:52 UTCGHSA enrichment
  41. 2026-09-22 16:36 UTCEG score recompute
  42. 2026-09-22 16:36 UTCGHSA enrichment
  43. 2026-09-22 16:01 UTCEPSS rescore
  44. 2026-09-22 04:32 UTCEG score recompute
  45. 2026-09-22 04:31 UTCGHSA enrichment
  46. 2026-09-22 04:01 UTCEG score recompute
  47. 2026-09-22 04:01 UTCGHSA enrichment
  48. 2026-09-21 17:25 UTCEG score recompute
  49. 2026-09-21 17:25 UTCGHSA enrichment
  50. 2026-09-21 16:35 UTCEG score recompute
  51. 2026-09-21 16:35 UTCGHSA enrichment
  52. 2026-09-21 15:22 UTCEG score recompute
  53. 2026-09-21 14:25 UTCEG score recompute
  54. 2026-09-21 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-94184?
CVE-2026-94184 is a high vulnerability published on September 21, 2026. A stack-based buffer overflow flaw was found in fetchmail when built with NTLM support. A malicious or compromised mail server advertising NTLM authentication can send a crafted Type 2 challenge that causes fetchmail to write past a fixed stack buffer while building the NTLM authenticate response.…
When was CVE-2026-94184 disclosed?
CVE-2026-94184 was first published on September 21, 2026, with the most recent update on October 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-94184 actively exploited?
CVE-2026-94184 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-94184?
CVE-2026-94184 has a CVSS v3.1 base score of 8.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-94184?
A fix for CVE-2026-94184 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-94184 are linked in the Vendor Advisories panel on this page.

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