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CVE-2026-34955— PraisonAI: Sandbox Escape via shell=True and Bypassable Blocklist in SubprocessSandbox

Quick assessment

Affected
MervinPraison PraisonAI
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PraisonAI是Mervin Praison个人开发者的一个低代码多智能体协作框架。 PraisonAI 4.5.97之前版本存在操作系统命令注入漏洞，该漏洞源于SubprocessSandbox在所有模式下均依赖字符串模式匹配来阻止危险命令，且阻止列表未包含sh或bash独立可执行文件，可能导致在STRICT模式下轻易逃逸沙箱。

CVSS 8.8 · High EPSS 0.39% · P31
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I. Basic Information for CVE-2026-34955

Vulnerability Information
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Vulnerability Title
PraisonAI: Sandbox Escape via shell=True and Bypassable Blocklist in SubprocessSandbox
Source: CVE Program / CVE List V5
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to version 4.5.97, SubprocessSandbox in all modes (BASIC, STRICT, NETWORK_ISOLATED) calls subprocess.run() with shell=True and relies solely on string-pattern matching to block dangerous commands. The blocklist does not include sh or bash as standalone executables, allowing trivial sandbox escape in STRICT mode via sh -c '<command>'. This issue has been patched in version 4.5.97.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
PraisonAI 操作系统命令注入漏洞
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 4.5.97之前版本存在操作系统命令注入漏洞，该漏洞源于SubprocessSandbox在所有模式下均依赖字符串模式匹配来阻止危险命令，且阻止列表未包含sh或bash独立可执行文件，可能导致在STRICT模式下轻易逃逸沙箱。
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 < 4.5.97 -

II. Public POCs for CVE-2026-34955

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III. Intelligence Information for CVE-2026-34955

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Vendor Advisories for CVE-2026-34955 (1)

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-2026-34954 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
CVE-2026-34939 6.5 MEDIUM PraisonAI: ReDoS via Unvalidated User-Controlled Regex in MCPToolIndex.search_tools()

IV. Related Vulnerabilities

Same product: PraisonAI
Same vendor: MervinPraison
Same weakness: CWE-78

V. Comments for CVE-2026-34955

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