CVE-2026-53872 picklescan CVE debrief

Who should care

Users of picklescan, especially those using versions before 0.0.35, should be aware of this vulnerability and take immediate action to protect their systems. Security teams and administrators responsible for servers with picklescan installed should prioritize patching and mitigation.

Technical summary

The vulnerability in picklescan arises from unsafe pickle deserialization. Pickle is a Python module for serializing and de-serializing Python objects. When picklescan deserializes untrusted input, it can lead to arbitrary code execution or, in this case, reading of arbitrary files. The exploit involves chaining io.FileIO and urllib.request.urlopen to read server files. This vulnerability has been assigned CWE-22, indicating it involves improper limitation of a pathname to a restricted directory.

Defensive priority

HIGH

Recommended defensive actions

• Update picklescan to version 0.0.35 or later.
• Restrict access to picklescan to only trusted users and networks.
• Implement additional security measures such as Web Application Firewalls (WAFs) to detect and prevent exploitation attempts.
• Monitor systems for suspicious activity that could indicate exploitation.
• Consider replacing picklescan with a safer alternative if available.
• Regularly review and update software dependencies to ensure they are secure.
• Limit the use of pickle for deserialization of untrusted input.

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and other reliable sources. The CVE record and NVD detail pages provide comprehensive information about the vulnerability, including its CVSS score, vector, and references.

Official resources