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Vulnerability record · CVE-2026-81522 · published 27 August 2026

CVE-2026-81522: A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special charac…

A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application.

8.6 CVSS 4.0 High EPSS 0.45% · top 63.2% CWE-116 · CWE-116 Undergoing Analysis
8.6CVSS 4.0 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
29 Aug 2026Last modified by NVD

Description

A weakness in the MongoDB C++ Driver's handling of caller-supplied namespace identifiers allows special characters embedded in those identifiers. An application that builds a namespace identifier from untrusted input without validating it may therefore have its operation directed at a different target than intended. This can result in limited unauthorized read and write access to data belonging to another logical tenant of the affected application.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1
https://jira.mongodb.org/browse/CXX-3552

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Source: NIST National Vulnerability Database (record CVE-2026-81522), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.