Deserialization in Picklescan
CVE-2025-71359
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.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (47.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Picklescan — versions 0, 0.0.29
Weakness classification (CWE)
References
- github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88 (vendor-advisory)
- www.vulncheck.com/advisories/picklescan-unsafe-deserialization-via-lib2to3-pgen… (third-party-advisory)
Frequently asked questions
- What is CVE-2025-71359?
- CVE-2025-71359 is a high-severity vulnerability in Picklescan, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2026-07-04.
- How severe is CVE-2025-71359?
- High severity. CVSS v3 base score is 8.1 out of 10.