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Vulnerability record · CVE-2025-71321 · published 17 June 2026

CVE-2025-71321: Deserialization of untrusted data vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.62% · top 52.2% CWE-502 · Deserialization of untrusted data Deferred
9.3CVSS 4.0 base score
0.62%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m273-6v24-x4m4
https://www.vulncheck.com/advisories/picklescan-arbitrary-file-writing-via-distutils-module-bypass
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-m273-6v24-x4m4

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Source: NIST National Vulnerability Database (record CVE-2025-71321), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.