Listen to this Post
The CVE-2025-21295 vulnerability exploits a flaw in the file extension validation logic of the Picklescan tool. The scanner checks a file’s extension against a whitelist of safe types (e.g., .pt, .pth) to determine if a security scan is required. An attacker can bypass this check by saving a malicious pickle serialized data file using one of these trusted PyTorch extensions. Consequently, the scanner incorrectly classifies the dangerous pickle file as a safe PyTorch model file and skips its security analysis. When this malicious file is subsequently loaded by a user or application, the embedded arbitrary code is executed, compromising the system.
Platform: Picklescan
Version: <=0.0.30
Vulnerability: Bypass
Severity: Critical
date: 2025-09-17
Prediction: Patch: 2025-09-24
What Undercode Say:
`picklescan -e .pt malicious.pt` Scan bypassed
`python -c “import pickle; pickle.load(open(‘malicious.pt’, ‘rb’))”` Code execution
How Exploit:
Craft malicious pickle file.
Rename with `.pt` extension.
Distribute file.
Protection from this CVE:
Update to version >0.0.30.
Scan all files indiscriminately.
Manually verify file contents.
Impact:
Arbitrary code execution.
System compromise.
Bypassed security controls.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
