CVE-2025-1945

Zip Flag Bit Exploit Crashes Picklescan But Not PyTorch

Published 10 Mar 2025Modified 17 Jun 2026CWE 345

In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

GHSA5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by GHSA (medium).

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.

Affected packages and fixed versions

Source	Package	Fixed in
pip::GitHub Security Advisory pip	picklescan	0.0.23

References

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