PySpector: Plugin Sandbox Bypass leads to Arbitrary Code Execution
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
Summary
PySpector is a static analysis security testing (SAST) Framework engineered for modern Python development workflows. PySpector versions 0.1.6 and prior are affected by a security validation bypass in the plugin system. The validate_plugin_code() function in plugin_system.py, performs static AST analysis to block dangerous API calls before a plugin is trusted and executed. However, the internal resolve_name() helper only handles ast.Name and ast.Attribute node types, returning None for all others. When a plugin uses indirect function calls via getattr() (such as getattr(os, 'system')) the outer call's func node is of type ast.Call, causing resolve_name() to return None, and the security check to be silently skipped. The plugin incorrectly passes the trust workflow, and executes arbitrary system commands on the user's machine when loaded. This issue has been patched in version 0.1.7.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ParzivalHack | PySpector | before 0.1.7 | 0.1.7 | Patch available | CNA |
| — | pyspector (PyPI) | before 0.1.7 | 0.1.7 | Patch available | GHSA-v3xv-8vc3-h2m6 |
- PySpector VendorParzivalHack Affected before 0.1.7 Fixed in 0.1.7 Patch available CNA
- pyspector (PyPI) Vendor— Affected before 0.1.7 Fixed in 0.1.7 Patch available GHSA-v3xv-8vc3-h2m6
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parzivalhack:pyspector:*:*:*:*:*:python:*:* | before 0.1.7 | Vulnerable | ParzivalHack |
- cpe:2.3:a:parzivalhack:pyspector:*:*:*:*:*:python:*:* Versions before 0.1.7 Vulnerable ·ParzivalHack
Remediation
- Fix · CNA PySpector (ParzivalHack) Fixed in 0.1.7
- Fix · GHSA-v3xv-8vc3-h2m6 pyspector (PyPI) Fixed in 0.1.7 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-33139
- 2026-10-03 Alias added: GHSA-v3xv-8vc3-h2m6
References
More ParzivalHack Pyspector vulnerabilities
- TI-2026-29825 PySpector has a Plugin Code Execution Bypass via Incomplete Static Analysis in PluginSecurity.validate_plugin_code CVSS 4.0MEDIUM 6.9
- TI-2026-25570 PySpector: Stored XSS in PySpector HTML Report Generation leads to Javascript Code Execution CVSS 4.0MEDIUM 5.3
Sources
- CVE-2026-33139 · CVE Program
- CVE-2026-33139 · NVD
- FIRST EPSS
- GHSA-v3xv-8vc3-h2m6 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences