CVE-2025-71359 | picklescan before 0.0.29 fails to detect malicious pickle pa… | CVSS 8.1 HIGH

Description

picklescan before 0.0.29 fails to detect malicious pickle payloads that utilize lib2to3.pgen2.grammar.Grammar.loads in the reduce method, allowing remote code execution. Attackers can craft pickle files embedding dangerous code that evades picklescan detection and executes during pickle.load() deserialization.

Metadata

CVE ID: CVE-2025-71359
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-20 12:55 UTC
Published: 2026-07-04 01:23 UTC
Last updated: 2026-07-04 01:23 UTC
Primary CWE: CWE-502
Deserialization of Untrusted Data
Vendor / Product: picklescan / picklescan
Sources: cve.org · NVD

Severity & Metrics

8.1 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products (1)

Vendor	Product	Platform	Versions
picklescan	picklescan	—	0 < 0.0.29, 0.0.29

Weakness (CWE)

CWE	Source	Description
CWE-502	cna	Deserialization of Untrusted Data

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.1	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
7.6	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References (2)

GitHub Security Advisory (GHSA-f54q-57x4-jg88) https://github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88
VulnCheck Advisory: picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loads https://www.vulncheck.com/advisories/picklescan-unsafe-deserialization-via-lib2to3-pgen2-grammar-grammar-loads