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CVE-2026-39888— PraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subprocess mode)

Quick assessment

Affected
MervinPraison praisonaiagents
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 1.5.115之前版本存在安全漏洞，该漏洞源于沙箱属性列表不完整，可能导致绕过安全限制并执行任意代码。

CVSS 10.0 · Critical EPSS 0.61% · P47
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I. Basic Information for CVE-2026-39888

Vulnerability Information
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Vulnerability Title
PraisonAIAgents has a sandbox escape via exception frame traversal in `execute_code` (subprocess mode)
Source: CVE Program / CVE List V5
Vulnerability Description
PraisonAI is a multi-agent teams system. Prior to 1.5.115, execute_code() in praisonaiagents.tools.python_tools defaults to sandbox_mode="sandbox", which runs user code in a subprocess wrapped with a restricted __builtins__ dict and an AST-based blocklist. The AST blocklist embedded inside the subprocess wrapper (blocked_attrs of python_tools.py) contains only 11 attribute names — a strict subset of the 30+ names blocked in the direct-execution path. The four attributes that form a frame-traversal chain out of the sandbox are all absent from the subprocess list (__traceback__, tb_frame, f_back, and f_builtins). Chaining these attributes through a caught exception exposes the real Python builtins dict of the subprocess wrapper frame, from which exec can be retrieved and called under a non-blocked variable name — bypassing every remaining security layer. This vulnerability is fixed in 1.5.115.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
违背安全设计原则
Source: CVE Program / CVE List V5
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 1.5.115之前版本存在安全漏洞，该漏洞源于沙箱属性列表不完整，可能导致绕过安全限制并执行任意代码。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
MervinPraison praisonaiagents < 1.5.115 -

II. Public POCs for CVE-2026-39888

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III. Intelligence Information for CVE-2026-39888

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Vendor Advisories for CVE-2026-39888 (1)

Same Patch Batch · MervinPraison · 2026-04-08 · 4 CVEs total

CVE-2026-39890 9.8 CRITICAL PraisonAI Affected by Remote Code Execution via YAML Deserialization in Agent Definition L
CVE-2026-39891 8.8 HIGH PraisonAI has a Template Injection in Agent Tool Definitions
CVE-2026-39889 7.5 HIGH PraisonAI has Unauthenticated SSE Event Stream Exposes All Agent Activity in A2U Server

IV. Related Vulnerabilities

Same product: praisonaiagents
Same vendor: MervinPraison
Same weakness: CWE-657

V. Comments for CVE-2026-39888

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