What’s Vulnerable › Vulnerabilities

CVE-2026-81526: Cross-database write redirection via unvalidated dotted database name in bulk write namespaces

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-27 · updated 2026-09-29
• Weakness: CWE-74

Description

The MongoDB Rust Driver does not neutralize special characters in a caller-supplied target identifier before embedding it in the request it sends to the server. An actor able to influence that identifier in an application using the driver may cause write operations to be applied to an unintended target within the same deployment using the application's own credentials. This may result in unauthorized modification of data belonging to another logical boundary enforced by the application.

Affected products

• MongoDB Rust Driver: from 3.0.0 before 3.8.2 — fixed in 3.8.2

How to fix

Upgrade to a fixed version: MongoDB Rust Driver 3.8.2. Check the vendor advisory for mitigations.

References

• https://github.com/mongodb/mongo-rust-driver/releases/tag/v3.8.2
• https://jira.mongodb.org/browse/RUST-2467

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