CVE-2025-71321 | picklescan before 0.0.33 contains an arbitrary file writing … | CVSS 9.8 CRITICAL

Description

picklescan before 0.0.33 contains an arbitrary file writing vulnerability that allows attackers to bypass the dangerous blocklist by using distutils.file_util.write_file. Attackers can construct malicious pickle objects to overwrite critical system files and achieve denial of service or remote code execution.

Metadata

CVE ID: CVE-2025-71321
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-08 20:44 UTC
Published: 2026-06-17 15:04 UTC
Last updated: 2026-06-17 18:12 UTC
Primary CWE: CWE-502
Deserialization of Untrusted Data
Vendor / Product: picklescan / picklescan
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
picklescan	picklescan	—	0 < 0.0.33, 0.0.33

Weakness (CWE)

CWE	Source	Description
CWE-502	cna	Deserialization of Untrusted Data

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3	CRITICAL	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References (2)

GHSA Advisory GHSA-m273-6v24-x4m4 https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m273-6v24-x4m4
VulnCheck Advisory: picklescan - Arbitrary File Writing via distutils Module Bypass https://www.vulncheck.com/advisories/picklescan-arbitrary-file-writing-via-distutils-module-bypass