CVE-2026-94184

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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 (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week

Also known asEUVD-2026-83923 (ENISA EUVD) · GHSA-5pfw-5pv2-2pc6 (GitHub Security Advisories)Source: ENISA EUVD

8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%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
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.2%
EPSS %ILE
68th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 21, 2026

Last Modified

October 21, 2026

Advisory Details (5)

Auto-updated Sep 21, 2026
Patch available. Sources: redhat.
Web page

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
Web page

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

https://gitlab.com/fetchmail/fetchmail/-/commit/cb5be5c38471eec19e519ace0bc569176317ea92
Red HatMentions a patch (unverified)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatfetchmail-0:6.4.24-1.el9_8.12026-10-21redhat
redhatfetchmail-0:6.4.24-1.el8_10.12026-10-21redhat
redhatfetchmail-0:6.4.38-3.el10_2.12026-10-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
fetchmail6.4.37-1 ... 6.6.8-1 (16 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
fetchmail6.4.39-1 ... 6.6.8-1 (14 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
fetchmail6.4.39-1 ... 6.6.6-1 (13 versions)
  • every version up to 6.6.8-1: fixed in 6.6.8-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 85× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 160 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 60 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  5. 2026-10-29 07:50 UTCEG score recompute
  6. 2026-10-29 07:50 UTCVendor advisory
  7. 2026-10-29 07:50 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  8. 2026-10-28 16:33 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  9. 2026-10-27 16:33 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  10. 2026-10-26 16:33 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  11. 2026-10-25 16:34 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  12. 2026-10-25 13:49 UTCEG score recompute
  13. 2026-10-24 16:34 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  14. 2026-10-23 16:33 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  15. 2026-10-22 16:35 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  16. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
  17. 2026-10-21 15:34 UTCEG score recompute
  18. 2026-10-21 15:34 UTCVendor advisory
  19. 2026-10-21 15:34 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-10-21 15:25 UTCEG score recompute
  21. 2026-10-21 15:25 UTCVendor advisory
  22. 2026-10-21 15:25 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-10-21 14:27 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  24. 2026-10-21 14:21 UTCVendor advisory
  25. 2026-10-21 14:21 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
Show 75 more
  1. 2026-10-21 13:46 UTCEG score recompute
  2. 2026-10-21 13:46 UTCVendor advisory
  3. 2026-10-21 13:46 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  4. 2026-10-21 13:45 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  5. 2026-10-20 18:27 UTCEG score recompute
  6. 2026-10-20 18:27 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-10-20 18:25 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  8. 2026-10-20 17:23 UTCEG score recompute
  9. 2026-10-20 17:22 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  10. 2026-10-20 17:21 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  11. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  12. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  13. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  14. 2026-10-18 02:58 UTCEG score recompute
  15. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  16. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  17. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  19. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  20. 2026-10-13 04:19 UTCEG score recompute
  21. 2026-10-13 04:19 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  22. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  23. 2026-10-12 14:42 UTCEG score recompute
  24. 2026-10-11 20:51 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  25. 2026-10-11 19:12 UTCEG score recompute
  26. 2026-10-11 16:27 UTCEG score recompute
  27. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  28. 2026-10-11 13:41 UTCEG score recompute
  29. 2026-10-11 08:39 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  30. 2026-10-10 20:30 UTCEG score recompute
  31. 2026-10-10 20:30 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  32. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  33. 2026-10-10 08:26 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  34. 2026-10-09 20:22 UTCEG score recompute
  35. 2026-10-09 20:22 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  36. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  37. 2026-10-09 08:17 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  38. 2026-10-08 20:12 UTCEG score recompute
  39. 2026-10-08 20:12 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  40. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  41. 2026-10-08 07:47 UTCEG score recompute
  42. 2026-10-08 07:47 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  43. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  44. 2026-10-07 19:41 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  45. 2026-10-07 07:36 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  46. 2026-10-06 19:31 UTCEG score recompute
  47. 2026-10-06 19:31 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  48. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  49. 2026-10-06 07:26 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-10-05 19:22 UTCEG score recompute
  51. 2026-10-05 19:22 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  52. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  53. 2026-10-05 07:10 UTCEG score recompute
  54. 2026-10-05 07:10 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  55. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  56. 2026-10-04 19:05 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  57. 2026-10-04 06:59 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-10-03 18:55 UTCEG score recompute
  59. 2026-10-03 18:55 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  60. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  61. 2026-10-03 06:50 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  62. 2026-10-02 18:46 UTCEG score recompute
  63. 2026-10-02 18:45 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  64. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  65. 2026-10-02 06:39 UTCEG score recompute
  66. 2026-10-02 06:38 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  67. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  68. 2026-10-01 18:30 UTCEG score recompute
  69. 2026-10-01 18:30 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  70. 2026-10-01 18:29 UTCNVD updateCVSS v3 → 8.1 · severity → HIGH
  71. 2026-10-01 17:21 UTCEG score recompute
  72. 2026-10-01 17:21 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-10-01 17:20 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  74. 2026-10-01 08:46 UTCGHSA enrichmentGHSA-5pfw-5pv2-2pc6 · GitHub severity HIGH · GitHub CVSS 8.1
  75. 2026-09-30 20:41 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-94184?
CVE-2026-94184 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-94184 was made public on June 27, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on September 21, 2026. EchelonGraph's copy of the record carries a last-modified date of October 21, 2026; the record at its source may have been updated since.
Is CVE-2026-94184 actively exploited?
CVE-2026-94184 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (68th 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.

Dependency Blast Radius

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