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Vulnerability record · CVE-2025-71349 · published 30 June 2026

CVE-2025-71349: Deserialization of untrusted data vulnerability

picklescan before 0.0.29 fails to detect the built-in trace.Trace.run function when analyzing pickle files, allowing attackers to embed undetected malicious code. Remote attackers can craft malicious pickle files using trace.Trace.run in the reduce method to achieve arbitrary code execution when pickle.load processes the file.

7.6 CVSS 4.0 High EPSS 0.61% · top 52.8% CWE-502 · Deserialization of untrusted data Deferred
7.6CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
1 Jul 2026Last modified by NVD

Description

picklescan before 0.0.29 fails to detect the built-in trace.Trace.run function when analyzing pickle files, allowing attackers to embed undetected malicious code. Remote attackers can craft malicious pickle files using trace.Trace.run in the reduce method to achieve arbitrary code execution when pickle.load processes the file.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-5qwp-399c-mjwf
https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-undetected-trace-trace-run-in-pickle-files
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-5qwp-399c-mjwf

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Source: NIST National Vulnerability Database (record CVE-2025-71349), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.