Deserialization in Picklescan
CVE-2025-71321
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (57.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Picklescan — versions 0, 0.0.33
Weakness classification (CWE)
References
- github.com/mmaitre314/picklescan/security/advisories/GHSA-m273-6v24-x4m4 (vendor-advisory)
- www.vulncheck.com/advisories/picklescan-arbitrary-file-writing-via-distutils-mo… (third-party-advisory)
Frequently asked questions
- What is CVE-2025-71321?
- CVE-2025-71321 is a critical-severity vulnerability in Picklescan, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-06-17.
- How severe is CVE-2025-71321?
- Critical severity. CVSS v3 base score is 9.8 out of 10.