Vulnerability · Published Jun 23, 2026 · Assigned by VulnCheck

CVE-2026-56315picklescan - Remote Code Execution via Unblocked Standard Library Modules

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 1.1% (higher than 67% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.1%top 33.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

picklescan before 1.0.4 fails to block at least seven Python standard library modules (including uuid, _osx_support, _aix_support, _pyrepl.pager, and imaplib) exposing eight functions that provide direct arbitrary command execution. Attackers can craft malicious pickle files importing these unblocked modules to achieve remote code execution while bypassing picklescan's safety validation entirely.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	picklescan	1.0.4	GHSA-g38g-8gr9-h9xp
PyPI	picklescan	1.0.4	PYSEC-2026-4134

Affected products (as reported)

Vendor	Product	Versions
picklescan	picklescan	0 – before 1.0.4

Weakness: CWE-184 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

GitHub Security Advisory (GHSA-g38g-8gr9-h9xp) vendor-advisory
VulnCheck Advisory: picklescan - Remote Code Execution via Unblocked Standard Library Modules third-party-advisory