CVE-2026-106435
MediumCVSS 5.1Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.
Risk Assessment
An attacker able to supply crafted BSON to the decoding API can remotely crash the application process using the MongoDB driver with the binary accelerator, causing denial of service.
Recommendation
Update the MongoDB Python Driver to a version containing the fix or avoid decoding untrusted BSON data through the decode/decode_all API.
Other vulnerabilities in MongoDB Python Driver
See all- CVE-2026-96749High
An integer overflow exists in the BSON document encoding component of the MongoDB Python Driver's bundled native extension when a document is built from an unusually large amount of caller-supplied data. Size arithmetic uses a signed 32-bit type and the overflow guard has undefined behavior under the C standard. Depending on how the native extension was built, this can cause an out-of-bounds write within the application's own process.
- CVE-2026-96747Medium
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.
- CVE-2026-88029High
The GridFS component of the MongoDB Python Driver contains an improper neutralization of special elements in data query logic, where a caller-supplied structured file identifier can be interpreted as a query condition rather than a literal identifier. An authenticated user who can influence the identifier may obtain stored file content beyond the intended target, cause all GridFS file chunks in the affected bucket to be removed, or rename a stored file other than the intended target.
Original NVD description (English source)
The MongoDB Python Driver's binary accelerator can read outside a buffer when an application decodes malformed BSON containing a truncated regular-expression element without a trailing NUL byte. An actor who can supply BSON to the documented decode or decode_all API can cause the application process to terminate when the C extension is loaded. The driver's normal database wire-protocol path does not reach this code.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS