CVE-2026-106435 — Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver

Affected: MongoDB Python Driver

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.

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CVE-2026-106435 — Application denial of service via out-of-bounds read in BSON Regex decoding in MongoDB Python Driver