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MEDIUM4.7

PYSEC-2026-1826

PyMongo Out-of-bounds Read in the bson module

Quick fix

PYSEC-2026-1826 — pymongo: upgrade to the fixed version with the command below.

pip install --upgrade 'pymongo>=4.6.3'

Details

Versions of the package pymongo before 4.6.3 are vulnerable to Out-of-bounds Read in the bson module. Using the crafted payload the attacker could force the parser to deserialize unmanaged memory. The parser tries to interpret bytes next to buffer and throws an exception with string. If the following bytes are not printable UTF-8 the parser throws an exception with a single byte.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/pymongo
Introduced in: 0Fixed in: 4.6.3
Fixpip install --upgrade 'pymongo>=4.6.3'

References