CVE-2026-93393

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-17. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 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%CVSS: 8.1Exploit: None knownExposed: 0

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

A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming encrypted traffic after the TLS handshake completes. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Triggering this issue may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.

CVSS v3
8.1
EG Score
8.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 17, 2026
No patch confirmed yet.
generic

SAML Login - MongoDB Jira - MongoDB Jira

https://jira.mongodb.org/browse/CDRIVER-6417

Vendor Advisories for CVE-2026-93393(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 31× in last 7d / 36× 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. 2026-09-25 07:34 UTCGHSA enrichment
  2. 2026-09-24 19:33 UTCEG score recompute
  3. 2026-09-24 19:33 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 07:32 UTCGHSA enrichment
  6. 2026-09-23 19:30 UTCEG score recompute
  7. 2026-09-23 19:30 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 07:26 UTCGHSA enrichment
  10. 2026-09-22 19:24 UTCEG score recompute
  11. 2026-09-22 19:24 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 07:23 UTCEG score recompute
  14. 2026-09-22 07:23 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 19:21 UTCGHSA enrichment
  17. 2026-09-21 07:19 UTCEG score recompute
  18. 2026-09-21 07:19 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 19:15 UTCGHSA enrichment
  21. 2026-09-20 07:14 UTCGHSA enrichment
  22. 2026-09-19 19:12 UTCEG score recompute
  23. 2026-09-19 19:12 UTCGHSA enrichment
  24. 2026-09-19 07:10 UTCEG score recompute
  25. 2026-09-19 07:10 UTCGHSA enrichment
Show 11 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:08 UTCGHSA enrichment
  3. 2026-09-18 18:26 UTCEG score recompute
  4. 2026-09-18 18:26 UTCGHSA enrichment
  5. 2026-09-18 17:44 UTCEG score recompute
  6. 2026-09-18 17:44 UTCGHSA enrichment
  7. 2026-09-18 09:21 UTCEG score recompute
  8. 2026-09-18 09:21 UTCGHSA enrichment
  9. 2026-09-17 21:20 UTCEG score recompute
  10. 2026-09-17 20:34 UTCEG score recompute
  11. 2026-09-17 20:34 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-93393?
CVE-2026-93393 is a high vulnerability published on September 17, 2026. A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming…
When was CVE-2026-93393 disclosed?
CVE-2026-93393 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93393 actively exploited?
CVE-2026-93393 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 62.2% of all scored CVEs.
What is the CVSS score of CVE-2026-93393?
CVE-2026-93393 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-93393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-93393, 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

Explore the affected products and dependency analysis for CVE-2026-93393

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