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.

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 critic…

Vulnerability class: Insecure Deserialization

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.

Affected products

Picklescan — versions 0, 0.0.33

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (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.