CVE-2026-81525

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 80% 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
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.

The MongoDB client library for PHP does not sufficiently sanitize special elements in application-supplied namespace identifiers before using them to construct the target namespace for database operations. An application that incorporates untrusted text into these identifiers may have operations silently directed at a different storage location than the one the application intended.

CVSS v3
8.1
EG Score
8.1(medium)
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
20%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 28, 2026

Advisory Details (2)

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

1.21.7

Patch available: mongodb/mongo-php-driver 1.21.7

https://github.com/mongodb/mongo-php-driver/releases/tag/1.21.7
github_release Patch Available

2.4.1

Patch available: mongodb/mongo-php-library 2.4.1

https://github.com/mongodb/mongo-php-library/releases/tag/2.4.1

Vendor Advisories for CVE-2026-81525(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 rangeFixed inDependents
php-mongodb1.15.0+1.11.1+1.9.2+1.7.5-1 ... 2.1.0-1 (11 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
php-mongodb2.0.0-1, 2.1.0-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
php-mongodb2.0.0-1, 2.1.0-1——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 44× 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 22:53 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 20:54 UTCEG score recompute
  4. 2026-09-16 14:54 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 12:50 UTCEG score recompute
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-13 21:51 UTCEG score recompute
  11. 2026-09-12 19:51 UTCEG score recompute
  12. 2026-09-11 17:51 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-10 15:51 UTCEG score recompute
  16. 2026-09-09 00:38 UTCEG score recompute
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-06 15:33 UTCEG score recompute
  19. 2026-09-06 13:48 UTCEPSS rescore
  20. 2026-09-06 02:32 UTCEG score recompute
  21. 2026-09-05 15:31 UTCEPSS rescore
  22. 2026-09-05 00:32 UTCEG score recompute
  23. 2026-09-04 11:31 UTCEG score recompute
  24. 2026-09-04 05:07 UTCEPSS rescore
  25. 2026-09-02 20:28 UTCEG score recompute
Show 19 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-01 16:40 UTCEG score recompute
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-09-01 04:40 UTCEPSS rescore
  5. 2026-09-01 04:40 UTCEPSS rescore
  6. 2026-08-31 01:24 UTCEG score recompute
  7. 2026-08-30 19:18 UTCEPSS rescore
  8. 2026-08-30 19:17 UTCEPSS rescore
  9. 2026-08-30 12:24 UTCEG score recompute
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-29 10:22 UTCEG score recompute
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 20:42 UTCEG score recompute
  14. 2026-08-28 19:46 UTCEG score recompute
  15. 2026-08-28 00:32 UTCEG score recompute
  16. 2026-08-27 23:24 UTCEG score recompute
  17. 2026-08-27 20:26 UTCEG score recompute
  18. 2026-08-27 20:15 UTCEG score recompute
  19. 2026-08-27 20:13 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-81525?
CVE-2026-81525 is a high vulnerability published on August 27, 2026. The MongoDB client library for PHP does not sufficiently sanitize special elements in application-supplied namespace identifiers before using them to construct the target namespace for database operations. An application that incorporates untrusted text into these identifiers may have operations…
When was CVE-2026-81525 disclosed?
CVE-2026-81525 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-2026-81525 actively exploited?
CVE-2026-81525 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 80.1% of all scored CVEs.
What is the CVSS score of CVE-2026-81525?
CVE-2026-81525 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-81525?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81525, 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

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