{"id":"CVE-2025-71343","title":"picklescan before 0.0.30 fails to detect malicious pickle files that exploit lib2to3.pgen2.pgen.ParserGenerator.make_label function in the reduce method","summary":"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…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-502"],"published":"2026-07-04","updated":"2026-07-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-71343","references":[{"url":"https://github.com/mmaitre314/picklescan/security/advisories/GHSA-p9w7-82w4-7q8m","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-lib2to3-pgen2-pgen-parsergenerator-make-label-detection-bypass","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00431,"epssPercentile":0.34752,"ingestedAt":"2026-07-04T21:57:46.827Z","slug":"CVE-2025-71343","body":"## Overview\n\npicklescan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}