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EUVD-2026-329199

fkie_cve-2026-56315

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.

GHSA-g38g-8gr9-h9xp — PickleScan has multiple stdlib modules with direct RCE not in blocklist

Affected: PyPI: picklescan

## Summary

picklescan v1.0.3 (latest) does not block at least 7 Python standard library modules that provide direct arbitrary command execution or code evaluation. A malicious pickle file importing these modules is reported as having 0 issues (CLEAN scan). This enables remote code execution that bypasses picklescan entirely.

## Severity

**Critical** (CVSS 9.8) — Direct RCE with zero scanner detection. Affects all deployments relying on picklescan, including HuggingFace Hub.

## Affected Versions

- picklescan <= 1.0.3 (all versions including latest)

## Details

### Unblocked RCE Modules

| Module | Function | RCE Mechanism | picklescan Result | |--------|----------|--------------|-------------------| | `uuid` | `_get_command_stdout(cmd, *args)` | `subprocess.Popen((cmd,) + args)` | CLEAN | | `_osx_support` | `_read_output(cmdstring)` | `os.system()` via temp file | CLEAN | | `_osx_support` | `_find_build_tool(toolname)` | Command injection via `%s` | CLEAN | | `_aix_support` | `_read_cmd_output(cmdstring)` | `os.system()` | CLEAN | | `_pyrepl.pager` | `pipe_pager(text, cmd)` | `subprocess.Popen(cmd, shell=True)` | CLEAN | | `_pyrepl.pager` | `tempfile_pager(text, cmd)` | `os.system(cmd + ...)` | CLEAN | | `imaplib` | `IMAP4_stream(command)` | `subprocess.Popen(command, shell=True)` | CLEAN | | `test.support.script_helper` | `assert_python_ok(*args)` | Spawns `python` subprocess | CLEAN |

All 8 functions are in Python's standard library and importable on all platforms.…

PYSEC-2026-4134 — PickleScan has multiple stdlib modules with direct RCE not in blocklist