CVE-2026-93394

LOWPre-NVD 3.73.7
EchelonGraph scoreMEDIUM confidence

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

Score 3.7 from GitHub Security Advisory published 2026-09-17. A secondary CVSS source baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-82438 (ENISA EUVD) · GHSA-cxv8-vf43-xcw5 (GitHub Security Advisories)Source: ENISA EUVD

3.7EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 3.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw in libmongoc's SCRAM authentication implementation caused the client to continue the authentication handshake and transmit the client proof even when a nonce mismatch was detected in the server's first message. An unauthorized party with a man-in-the-middle position could exploit this by injecting a crafted server-first-message containing a controlled salt and low iteration count, then capturing the resulting client proof to perform offline password cracking. This vulnerability is mitigated by TLS, which is standard in production deployments.

CVSS v3
3.7
EG Score
3.7LOWmedium confidence
EG Risk
17
EG Risk 17/100

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)
Severity37% × 45%
Impact severity (EG Severity): CVSS 3.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
0.3%
EPSS %ILE
25th
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 (3.7): severity, escalated by confirmed exploitation. This CVE's 3.7 is its impact severity (EG Severity), not escalated.

EG Severity
3.7 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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 every mission impact level.CISA BOD 26-04: 60 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 every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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 17, 2026

Last Modified

September 25, 2026

References (1)

Vendor Advisories for CVE-2026-93394(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-c-driver1.23.1-1 ... 2.5.5-1 (54 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-c-driver1.30.4-1 ... 2.5.5-1 (23 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
mongo-c-driver1.30.4-1 ... 2.3.3-1 (14 versions)
  • every version up to 2.4.0-1: fixed in 2.4.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 45× 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.

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. 1 repeat row among the latest 75 is merged into the row it repeats.

  1. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-28 03:25 UTCOSV refresh
  8. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-25 13:49 UTCEG score recompute
  12. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-10-18 02:59 UTCEG score recompute
  20. 2026-10-17 21:35 UTCEG score recompute
  21. 2026-10-17 21:35 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
Show 49 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-10-12 14:43 UTCEG score recompute
  4. 2026-10-11 19:12 UTCEG score recompute
  5. 2026-10-11 16:28 UTCEG score recompute
  6. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-10-11 13:42 UTCEG score recompute
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-10 10:46 UTCEG score recompute
  10. 2026-10-10 10:46 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  11. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-10-07 12:52 UTCEG score recompute
  15. 2026-10-07 12:52 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  16. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-10-04 23:23 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-10-04 14:58 UTCEG score recompute
  20. 2026-10-04 14:58 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-10-01 17:05 UTCEG score recompute
  24. 2026-10-01 17:05 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  25. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  26. 2026-09-28 18:34 UTCEG score recompute
  27. 2026-09-28 18:34 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  28. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  29. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  30. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  31. 2026-09-25 20:40 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  32. 2026-09-24 15:04 UTCEG score recompute
  33. 2026-09-24 15:04 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  34. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  35. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  36. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  37. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  38. 2026-09-21 17:01 UTCEG score recompute
  39. 2026-09-21 17:01 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  40. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  41. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  42. 2026-09-18 19:08 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  43. 2026-09-18 15:26 UTCEG score recompute
  44. 2026-09-18 15:26 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  45. 2026-09-18 14:35 UTCEG score recompute
  46. 2026-09-18 14:35 UTCGHSA enrichmentGHSA-cxv8-vf43-xcw5 · GitHub CVSS 3.7
  47. 2026-09-17 21:20 UTCEG score recompute
  48. 2026-09-17 20:34 UTCEG score recomputeFirst assessed: 3.7 LOW
  49. 2026-09-17 20:34 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-93394?
CVE-2026-93394 is a low-severity vulnerability; its CVE record was published on September 17, 2026. A flaw in libmongoc's SCRAM authentication implementation caused the client to continue the authentication handshake and transmit the client proof even when a nonce mismatch was detected in the server's first message. An unauthorized party with a man-in-the-middle position could exploit this by…
When was the CVE record for CVE-2026-93394 published?
The CVE record for CVE-2026-93394 was published on September 17, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 25, 2026; the record at its source may have been updated since.
Is CVE-2026-93394 actively exploited?
CVE-2026-93394 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-93394?
CVE-2026-93394 has a CVSS base score of 3.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-93394?
A fix for CVE-2026-93394 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-93394 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-93394

Explore →

Is Your Infrastructure Affected by CVE-2026-93394?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs