Vulnerability · Published Jun 30, 2026 · Assigned by VulnCheck

CVE-2025-71349picklescan - Arbitrary Code Execution via Undetected trace.Trace.run in Pickle Files

High 8.1

In plain English

A high-severity unsafe deserialization in picklescan from picklescan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.6%top 50.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

picklescan before 0.0.29 fails to detect the built-in trace.Trace.run function when analyzing pickle files, allowing attackers to embed undetected malicious code. Remote attackers can craft malicious pickle files using trace.Trace.run in the reduce method to achieve arbitrary code execution when pickle.load processes the file.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	picklescan	0.0.29	GHSA-5qwp-399c-mjwf

Affected products (as reported)

Vendor	Product	Versions
picklescan	picklescan	0 – before 0.0.29

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-5qwp-399c-mjwf) vendor-advisory
VulnCheck Advisory: picklescan - Arbitrary Code Execution via Undetected trace.Trace.run in Pickle Files third-party-advisory