PatchSiren cyber security CVE debrief
CVE-2026-56315 picklescan CVE debrief
The CVE-2026-56315 vulnerability in picklescan before version 1.0.4 allows for remote code execution. This is due to the failure of picklescan to block at least seven Python standard library modules, including uuid, _osx_support, _aix_support, _pyrepl.pager, and imaplib, which expose eight functions. These functions can be exploited by crafting malicious pickle files that import these unblocked modules, thereby bypassing picklescan's safety validation entirely. The vulnerability has a CVSS score of 9.3 and is classified as CRITICAL. It was published on June 23, 2026, at 13:16:45.770Z and modified at 14:52:58.543Z the same day.
- Vendor
- picklescan
- Product
- Unknown
- CVSS
- CRITICAL 9.3
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-23
- Original CVE updated
- 2026-06-23
- Advisory published
- 2026-06-23
- Advisory updated
- 2026-06-23
Who should care
Organizations using picklescan before version 1.0.4 should be concerned about this vulnerability as it allows for remote code execution. This could potentially lead to significant security breaches if exploited. Therefore, users of affected versions should prioritize updating to version 1.0.4 or later to mitigate this risk.
Technical summary
CVE-2026-56315 is a critical vulnerability in picklescan, a tool designed to scan Python pickle files for potential security issues. The vulnerability arises from picklescan's failure to properly block certain Python standard library modules, including but not limited to uuid, _osx_support, _aix_support, _pyrepl.pager, and imaplib. These modules provide functions that can be leveraged for remote code execution when exploited through maliciously crafted pickle files. The vulnerability is particularly dangerous because it allows attackers to bypass picklescan's safety validation mechanisms entirely, leading to potential remote code execution with no restrictions.
Defensive priority
High priority should be given to updating picklescan to version 1.0.4 or later. Additionally, defenders should review their current inventory of picklescan usage and prioritize remediation for any instances running vulnerable versions.
Recommended defensive actions
- Update picklescan to version 1.0.4 or later immediately.
- Review current inventory for picklescan usage and prioritize remediation for vulnerable instances.
- Implement additional monitoring for suspicious pickle file activity.
- Restrict the use of pickle files to trusted sources only.
- Consider implementing compensating controls for environments where an update is not immediately feasible.
Evidence notes
The evidence for this CVE comes from multiple sources, including the NVD and Vulncheck. The CVE record and details were obtained from CVE.org, providing an official overview of the vulnerability. Additional information was sourced from Vulncheck's advisory on the vulnerability, offering insights into the exploitation and impact.
Official resources
This article is AI-assisted and based on the supplied source corpus.