CVE-2026-34939— PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()
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I. Basic Information for CVE-2026-34939
Vulnerability Information
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Vulnerability Title
PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()
Source: NVD (National Vulnerability Database)
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to version 4.5.90, MCPToolIndex.search_tools() compiles a caller-supplied string directly as a Python regular expression with no validation, sanitization, or timeout. A crafted regex causes catastrophic backtracking in the re engine, blocking the Python thread for hundreds of seconds and causing a complete service outage. This issue has been patched in version 4.5.90.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1333
Source: NVD (National Vulnerability Database)
Vulnerability Title
PraisonAI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PraisonAI是Mervin Praison个人开发者的一个低代码多智能体协作框架。 PraisonAI 4.5.90之前版本存在安全漏洞，该漏洞源于MCPToolIndex.search_tools函数将调用者提供的字符串直接编译为正则表达式，未经验证、清理或设置超时，可能导致正则表达式拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MervinPraison | PraisonAI | < 4.5.90 | - |
II. Public POCs for CVE-2026-34939
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|---|
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Same Patch Batch · MervinPraison · 2026-04-03 · 10 CVEs total
| CVE-2026-34938 | 10.0 CRITICAL | PraisonAI: Python Sandbox Escape via str Subclass startswith() Override in execute_code |
| CVE-2026-34934 | 9.8 CRITICAL | PraisonAI: Second-Order SQL Injection in `get_all_user_threads` |
| CVE-2026-34935 | 9.8 CRITICAL | PraisonAI: OS Command Injection in MCPHandler.parse_mcp_command() |
| CVE-2026-34952 | 9.1 CRITICAL | PraisonAI: Missing Authentication in WebSocket Gateway |
| CVE-2026-34953 | 9.1 CRITICAL | PraisonAI: Authentication Bypass in OAuthManager.validate_token() |
| CVE-2026-34955 | 8.8 HIGH | PraisonAI: Sandbox Escape via shell=True and Bypassable Blocklist in SubprocessSandbox |
| CVE-2026-34954 | 8.6 HIGH | PraisonAI: SSRF in FileTools.download_file() via Unvalidated URL |
| CVE-2026-34937 | 7.8 HIGH | PraisonAI: Shell Injection in run_python() via Unescaped $() Substitution |
| CVE-2026-34936 | 7.7 HIGH | PraisonAI: SSRF via Unvalidated api_base in passthrough() Fallback |
IV. Related Vulnerabilities
Same product: PraisonAI
- CVE-2026-44340
PraisonAI: Symlink-extraction bypass of `_safe_extractall` w - CVE-2026-44339
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PraisonAI MCP `tools/call` path-traversal and RCE via Python
Same vendor: MervinPraison
- CVE-2026-44340
PraisonAI: Symlink-extraction bypass of `_safe_extractall` w - CVE-2026-44339
PraisonAI has unsafe tool resolution in `ToolExecutionMixin. - CVE-2026-44338
PraisonAI ships and generates a legacy API server with authe - CVE-2026-44337
PraisonAI knowledge-store backends interpolate unvalidated c - CVE-2026-44336
PraisonAI MCP `tools/call` path-traversal and RCE via Python
Same weakness: CWE-1333
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