Malicious-model scanning bypass via mismatched ZIP filenames
Published Mar 10, 2025 · Updated Dec 29, 2025
Archive validation bypass in picklescan before 0.0.23 allows remote attackers to evade malicious PyTorch model scanning. The scan_zip_bytes path uses Python's strict ZipFile.open operation, which aborts when an entry's local-header filename differs from its central-directory name. Exploitation requires a crafted model to be scanned and then loaded; the scanner fails while PyTorch accepts the archive, leaving the embedded pickle payload unexamined.
Summary
What happened
Archive validation bypass in picklescan before 0.0.23 allows remote attackers to evade malicious PyTorch model scanning. The scan_zip_bytes path uses Python's strict ZipFile.open operation, which aborts when an entry's local-header filename differs from its central-directory name. Exploitation requires a crafted model to be scanned and then loaded; the scanner fails while PyTorch accepts the archive, leaving the embedded pickle payload unexamined.
The record
- CVE
- CVE-2025-1944
- Published
- Mar 10, 2025
- Updated
- Dec 29, 2025
- Vendor
- Matthieu Maitre
- Product
- picklescan
- Classifications
- CWE-345, T1204.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 10, 2025CVE publishedPublication date reported by the CVE source.
- Dec 29, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.1 <0.0.23
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Mismatched ZIP filename model proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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