PatchSiren cyber security CVE debrief
CVE-2026-56304 picklescan CVE debrief
CVE-2026-56304 is a medium-severity vulnerability in picklescan before 1.0.1. The issue allows unauthenticated attackers to create arbitrary zero-byte files via the logging.FileHandler class instantiation. This can be exploited by crafting malicious pickle payloads to bypass RCE blocklists and create lock files or other filesystem artifacts, potentially causing denial of service or application disruption. Affected organizations should assess their exposure and prioritize patching.
- Vendor
- picklescan
- Product
- Unknown
- CVSS
- MEDIUM 6.9
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-20
- Original CVE updated
- 2026-06-22
- Advisory published
- 2026-06-20
- Advisory updated
- 2026-06-22
Who should care
Organizations using picklescan before version 1.0.1 should be aware of this vulnerability and assess their exposure. This includes teams responsible for maintaining and securing software dependencies, as well as security teams monitoring for potential threats. The vulnerability's medium severity and potential for denial of service or application disruption make it important for defenders to prioritize patching.
Technical summary
The vulnerability exists in the picklescan library before version 1.0.1. It is caused by an unsafe pickle deserialization issue. Attackers can exploit this by crafting malicious pickle payloads, which can bypass RCE blocklists. The exploitation leads to the creation of arbitrary zero-byte files through the logging.FileHandler class instantiation. This can result in the creation of lock files or other filesystem artifacts, potentially causing denial of service or application disruption.
Defensive priority
Medium priority due to potential for denial of service or application disruption
Recommended defensive actions
- Inventory and assess exposure of picklescan versions before 1.0.1
- Review and apply official patches or updates for picklescan
- Monitor for suspicious activity related to pickle deserialization
- Implement compensating controls to limit exploitation
- Track exceptions and anomalies in logging and file system interactions
Evidence notes
The primary evidence for this vulnerability comes from the CVE record and NVD detail pages. The vulnerability affects picklescan before version 1.0.1. Defenders should verify the version of picklescan in use and check for official patches or updates. The CVE and NVD pages provide additional details about the vulnerability and its potential impact.
Official resources
This article is AI-assisted and based on the supplied source corpus.