Vulnerability · Published Jun 22, 2026 · Assigned by VulnCheck

CVE-2025-71344picklescan - Arbitrary Code Execution via Undetected ensurepip._run_pip Function

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 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.5%top 59.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

picklescan before 0.0.30 (affected versions 0.0.26 and earlier) fails to detect the ensurepip._run_pip built-in function when scanning pickle files, allowing attackers to execute arbitrary code. Malicious pickle files embedding ensurepip._run_pip calls in __reduce__ methods bypass picklescan detection and achieve remote code execution upon pickle.load() invocation.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	picklescan	0.0.30	GHSA-xp4f-hrf8-rxw7
PyPI	picklescan	0.0.30	PYSEC-2026-1792

Affected products (as reported)

Vendor	Product	Versions
picklescan	picklescan	0 – before 0.0.30

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-xp4f-hrf8-rxw7) vendor-advisory
VulnCheck Advisory: picklescan - Arbitrary Code Execution via Undetected ensurepip._run_pip Function third-party-advisory