Vulnerability · Published Jun 17, 2026 · Assigned by VulnCheck

CVE-2025-71325picklescan - Detection Bypass via STACK_GLOBAL Opcode Parsing Logic Flaw

Critical 9.8

In plain English

A critical-severity security flaw 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 49% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.6%top 50.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

picklescan before 0.0.27 contains a parsing logic error in the _list_globals function when handling STACK_GLOBAL opcodes, failing to track arguments in the correct range and allowing malicious pickle files to bypass detection. Attackers can craft pickle files with arguments at position zero to trigger unexpected exceptions and evade security scanning.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	picklescan	0.0.27	GHSA-9gvj-pp9x-gcfr
PyPI	picklescan	0.0.27	PYSEC-2026-1788

Affected products (as reported)

Vendor	Product	Versions
picklescan	picklescan	0 – before 0.0.27

Weakness: CWE-391 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

GHSA Advisory GHSA-9gvj-pp9x-gcfr vendor-advisory
https://github.com/mmaitre314/picklescan/commit/2a8383cfeb4158567f9770d86597300c9e508d0f patch
VulnCheck Advisory: picklescan - Detection Bypass via STACK_GLOBAL Opcode Parsing Logic Flaw third-party-advisory