Vulnerability in MongoDB C++ Driver
CVE-2026-81522
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/mongodb/mongo-cxx-driver/releases/tag/r4.5.1 (Product)
- jira.mongodb.org/browse/CXX-3552 (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-81522?
- CVE-2026-81522 is a high-severity vulnerability in MongoDB C++ Driver, classified under Improper Encoding or Escaping of Output. CVSS score: 8.1/10. Published 2026-08-27.
- How severe is CVE-2026-81522?
- High severity. CVSS v3 base score is 8.1 out of 10.