What’s Vulnerable › Vulnerabilities

CVE-2026-96747: Forced local Unix socket connection via dot-sock KMS endpoint in client-side field encryption

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-24
• Weakness: CWE-918

Description

The client-side field level encryption support in the MongoDB Python Driver can treat a key management endpoint value ending in ".sock" as a local Unix domain socket path rather than a remote host. A user with write access to the encryption key metadata stored in the database can cause an application using the driver to open connections to local sockets on the application host. Data sent over these connections is limited to the start of a TLS handshake, so no chosen content is transmitted.

Affected products

• MongoDB Python Driver: from 3.9.0 before 4.18.2 — fixed in 4.18.2

How to fix

Upgrade to a fixed version: MongoDB Python Driver 4.18.2. Check the vendor advisory for mitigations.

References

• https://github.com/mongodb/mongo-python-driver/blob/4.18.2/doc/changelog.rst
• https://github.com/mongodb/mongo-python-driver/releases/tag/4.18.2
• https://github.com/mongodb/mongo-python-driver/security/advisories/GHSA-qx36-8mw2-4r3x

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