CVE-2025-71363 picklescan CVE debrief

Who should care

Defenders responsible for systems using picklescan, particularly those deserializing pickle files from untrusted sources, should assess exposure and prioritize updates to prevent potential code execution upon deserialization of malicious pickle files. This includes verifying picklescan versions, restricting deserialization of pickle files, and monitoring for exploitation attempts. Security teams and vulnerability management teams should review the CVE and

Why it matters

CVE-2025-71363 allows attackers to execute arbitrary code via malicious pickle files, impacting systems using picklescan before 0.0.30. Defenders should verify versions, restrict deserialization, and monitor for exploitation attempts.

• Potential arbitrary code execution upon deserialization of malicious pickle files
• Possible bypass of picklescan detection for cProfile.run payloads
• Need for verification of picklescan versions and potential impact on systems
• Priority for updating picklescan to version 0.0.30 or later

Technical summary

The picklescan library before version 0.0.30 fails to detect cProfile.run function calls in pickle reduce methods, allowing attackers to craft malicious pickle files that can execute arbitrary code upon deserialization. This vulnerability impacts systems using picklescan, particularly those deserializing pickle files from untrusted sources. Defenders should verify picklescan versions and update to 0.0.30 or later to prevent potential code execution. The vulnerability allows attackers to bypass picklescan detection for cProfile.run payloads.

Defensive priority

Defenders should prioritize verifying picklescan versions and updating to 0.0.30 or later.

Recommended defensive actions

• Verify picklescan version and update to 0.0.30 or later
• Review and restrict pickle file deserialization processes
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the scope of affected versions and potential impact require further verification. Defenders should verify picklescan versions, restrict deserialization of pickle files from untrusted sources, and monitor for exploitation attempts. The vulnerability allows attackers to craft malicious pickle files with cProfile.run payloads that bypass picklescan detection and achieve code execution upon deserialization.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.