CVE-2025-1945

picklescan - Zip Flag Bit Exploit Crashes Picklescan But Not PyTorch

State: Published
Severity: 5.3 Medium
Published: Mar 10, 2025
Updated: Dec 29, 2025
Reserved: Mar 4, 2025

Description

picklescan before 0.0.23 fails to detect malicious pickle files inside PyTorch model archives when certain ZIP file flag bits are modified. By flipping specific bits in the ZIP file headers, an attacker can embed malicious pickle files that remain undetected by PickleScan while still being successfully loaded by PyTorch's torch.load(). This can lead to arbitrary code execution when loading a compromised model.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L	Sonatype

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
picklescanmmaitre314	0.0.1 to before 0.0.23Affected

References

https://www.sonatype.com/security-advisories/cve-2025-1945third-party-advisory
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-w8jq-xcqf-f792vendor-advisory
https://github.com/mmaitre314/picklescan/commit/e58e45e0d9e091159c1554f9b04828bbb40b9781patch

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