PyMongo: PYTHON-5996 Heap out-of-bounds write via signed size overflow in BSON document encoding
An integer overflow in the BSON document encoding component of the MongoDB Python Driver's bundled native extension may occur when a single document is built from an unusually large amount of caller-supplied data. Size arithmetic is performed in a signed 32-bit type, and the guard meant to catch the overflow is written in a form whose behavior is not defined by the C language standard. A party with no privileges who can place a very large value into data that an application encodes may, depending on how the native extension was built, cause a write outside the bounds of an allocated buffer inside the application's own process.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | pymongo | < 4.18.2 | 4.18.2 |
Referencias
- https://github.com/mongodb/mongo-python-driver/security/advisories/GHSA-v4x9-3549-crwv
- https://nvd.nist.gov/vuln/detail/CVE-2026-96749
- https://github.com/mongodb/mongo-python-driver/pull/3066
- https://github.com/mongodb/mongo-python-driver/commit/640dd2383a1a2fb1a10e5222d50ebc0b22a61bd7
- https://github.com/mongodb/mongo-python-driver/commit/6ab44be0e97c9d1d5a23725c4978fb25f3249485
- https://github.com/mongodb/mongo-python-driver
- 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://www.mongodb.com/community/forums/t/pymongo-4-18-2-released/343732
- https://pypi.org/project/pymongo
- https://github.com/advisories/GHSA-v4x9-3549-crwv
- Vector CVSS
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-190- Plataforma
- Python (PyPI)
- Paquete
pymongo- Publicada
- 05.10.2026
- Actualizado
- 15.10.2026 18:17
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-4296 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-v4x9-3549-crwv - CC BY 4.0
Historial de vulnerabilidades: pymongo
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 6
- Primera → última
- 08.2013 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 2
- Media 4
Divulgaciones por año
- 2017: 0
- 2018: 0
- 2019: 0
- 2020: 0
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 4
antes: 1
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PyMongo: PYTHON-5996 Heap out-of-bounds write via signed size overflow in BSON document encoding esta entrada
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