CVE-2025-71343CWE-502insecure-deserialization

CVE-2025-71343

High · published July 4, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
30.8
In the wild
Unconfirmed
What it is

picklescan before 0.0.30 fails to detect malicious pickle files that exploit lib2to3.pgen2.pgen.ParserGenerator.make_label function in the reduce method. Attackers can craft malicious pickle files with embedded code that evades detection but executes arbitrary commands when pickle.load() is called.

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
0.00380 · 30.8th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-07-04T06:16Z
References (3)
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-p9w7-82w4-7q8m · [email protected]https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-lib2to3-pgen2-pgen-parsergenerator-make-label-detection-bypass · [email protected]https://github.com/mmaitre314/picklescan/security/advisories/GHSA-p9w7-82w4-7q8m · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 04 JUL 01:23Z
    picklescan - Arbitrary Code Execution via lib2to3.pgen2.pgen.ParserGenerator.make_label Detection Bypass
    cvelistv5