Vulnerability in pyspector (CVE-2026-33139)
Summary
Vulnerability in pyspector (CVE-2026-33139). Risk of unauthorized operations or information disclosure. Exploitable via plugin_system.py. Mitigation: upgrade to 0.1.7 or later.
Original description
The description as published by the source.
Summary
PySpector versions <= 0.1.6 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.
Impact
An attacker who can deliver a malicious plugin file to a PySpector user and convince them to install it, can achieve arbitrary code execution on the user's local machine. Exploitation requires the victim to explicitly run pyspector plugin install --trust on the malicious file (a deliberate multi-step action that meaningfully limits the attack surface compared to passive vulnerabilities). However, the bypass directly undermines the security guarantee that validate_plugin_code() is designed to provide. Once the plugin is trusted and executed, the following is achievable:
- Full read/write access to the local filesystem
- Exfiltration of sensitive data and environment variables (i.e. API keys, credentials, etc...)
-…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-33139 has been found in pyspector.
Attackers can target a specific entry point like plugin_system.py over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade pyspector to 0.1.7 or later.
If unsure, ask your IT team or search "pyspector CVE-2026-33139" on the vendor's site.
CVE-2026-33139 (pyspector) — CWE-184
Attack surface: plugin_system.py / ast.Name / ast.Attribute / None
Patched: 0.1.7 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-184) exists in pyspector. Attackers reach the vulnerable code path via plugin_system.py.
Check the vendor advisory for the affected versions of pyspector. Attack surface: plugin_system.py / ast.Name / ast.Attribute / None.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 0.1.7.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'pyspector' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'pyspector' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
pyspectorを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade pyspector to 0.1.7ステージング環境で 0.1.7 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com