CVE-2026-81524

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name components to pass without sanitization when the driver composes the target namespace for an operation. An application that incorporates untrusted input into these name components can have operations directed at a resource other than the one intended.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 27, 2026
Patch available. Sources: github_release.
github_release Patch Available

mongo-c-driver 2.5.1

Patch available: mongodb/mongo-c-driver 2.5.1

https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.1

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
mongo-c-driver1.23.1-1 ... 2.5.1-1 (51 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
mongo-c-driver1.30.4-1 ... 2.5.1-1 (19 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
mongo-c-driver1.30.4-1 ... 2.5.0-1 (16 versions)2.5.1-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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. 2026-09-18 22:51 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 00:02 UTCEG score recompute
  4. 2026-09-17 00:51 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-16 02:01 UTCEG score recompute
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-14 04:22 UTCEG score recompute
  11. 2026-09-13 05:32 UTCEG score recompute
  12. 2026-09-12 06:43 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 07:53 UTCEG score recompute
  16. 2026-09-09 10:07 UTCEG score recompute
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-08 11:17 UTCEG score recompute
  19. 2026-09-07 09:48 UTCEG score recompute
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-05 12:08 UTCEG score recompute
  22. 2026-09-04 13:15 UTCEG score recompute
  23. 2026-09-04 05:07 UTCEPSS rescore
  24. 2026-09-02 15:35 UTCEG score recompute
  25. 2026-09-02 14:12 UTCEPSS rescore
Show 18 more
  1. 2026-09-01 16:43 UTCEG score recompute
  2. 2026-09-01 13:54 UTCEPSS rescore
  3. 2026-09-01 04:40 UTCEPSS rescore
  4. 2026-09-01 04:40 UTCEPSS rescore
  5. 2026-08-31 17:54 UTCEG score recompute
  6. 2026-08-30 19:18 UTCEPSS rescore
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 19:03 UTCEG score recompute
  9. 2026-08-30 01:22 UTCEPSS rescore
  10. 2026-08-29 20:14 UTCEG score recompute
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 20:41 UTCEG score recompute
  13. 2026-08-28 19:47 UTCEG score recompute
  14. 2026-08-28 00:32 UTCEG score recompute
  15. 2026-08-27 23:24 UTCEG score recompute
  16. 2026-08-27 20:26 UTCEG score recompute
  17. 2026-08-27 20:15 UTCEG score recompute
  18. 2026-08-27 20:13 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-81524?
CVE-2026-81524 is a medium vulnerability published on August 27, 2026. A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name components to pass without sanitization when the driver composes the target namespace for an operation. An application that incorporates untrusted input into these name components can have…
When was CVE-2026-81524 disclosed?
CVE-2026-81524 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81524 actively exploited?
CVE-2026-81524 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 94.8% of all scored CVEs.
What is the CVSS score of CVE-2026-81524?
CVE-2026-81524 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-81524?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81524, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-81524

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