CVE-2025-71359CWE-502insecure-deserialization

CVE-2025-71359

High · published July 4, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
48.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00613 · 48.7th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-07-04T06:16Z
References (3)
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88 · [email protected]https://www.vulncheck.com/advisories/picklescan-unsafe-deserialization-via-lib2to3-pgen2-grammar-grammar-loads · [email protected]https://github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 04 JUL 01:23Z
    picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loads
    cvelistv5