picklescan up to 1.0.3 _osx_support/_aix_support/_pyrepl.pager/imaplib incomplete blacklist

Summaryinfo

A vulnerability has been found in picklescan up to 1.0.3 and classified as critical. This issue affects some unknown processing of the component _osx_support/_aix_support/_pyrepl.pager/imaplib. The manipulation leads to incomplete blacklist. This vulnerability is listed as CVE-2026-56315. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in picklescan up to 1.0.3 and classified as critical. This issue affects an unknown part of the component _osx_support/_aix_support/_pyrepl.pager/imaplib. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. Using CWE to declare the problem leads to CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

picklescan before 1.0.4 fails to block at least seven Python standard library modules (including uuid, _osx_support, _aix_support, _pyrepl.pager, and imaplib) exposing eight functions that provide direct arbitrary command execution. Attackers can craft malicious pickle files importing these unblocked modules to achieve remote code execution while bypassing picklescan's safety validation entirely.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-56315 since 06/20/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1562.006 for this issue.

Upgrading to version 1.0.4 eliminates this vulnerability.

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Productinfo

Name

• picklescan

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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