CVE-2026-31246: GPT-Pilot RCE Vulnerability

CVE-2026-31246 Overview

CVE-2026-31246 is a command injection vulnerability [CWE-78] in GPT-Pilot, an AI developer tool maintained by Pythagora-io. The flaw affects all builds through commit 0819827ce20346ef5f25b3fe29293cb448840565 dated 2025-09-03. The Executor.run() method passes user-confirmed command strings directly to asyncio.create_subprocess_shell() without validation. An attacker who can influence the confirmation prompt can substitute arbitrary shell commands. Successful exploitation yields code execution with the privileges of the GPT-Pilot process.

Critical Impact
Arbitrary shell command execution on the host running GPT-Pilot, enabling data theft, lateral movement, or persistence under the developer's account context.

Affected Products

GPT-Pilot through commit 0819827ce20346ef5f25b3fe29293cb448840565 (2025-09-03)
Pythagora-io GPT-Pilot main branch builds prior to remediation
Any downstream forks integrating the unpatched Executor.run() logic

Discovery Timeline

2026-05-11 - CVE-2026-31246 published to NVD
2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-31246

Vulnerability Analysis

GPT-Pilot orchestrates code generation and execution by translating LLM output into shell commands. Before execution, the system prompts the user to confirm or edit the proposed command. The Executor.run() method accepts this free-text input and forwards it without sanitization to asyncio.create_subprocess_shell(). Because create_subprocess_shell() invokes the system shell, metacharacters such as ;, &&, |, and backticks are interpreted as command separators. An attacker who controls the LLM output or who can social-engineer the developer can replace a benign command with arbitrary shell instructions. The exploit succeeds at the moment the user accepts the modified command, granting execution with the privileges of the running GPT-Pilot process.

Root Cause

The root cause is the absence of input validation and shell-argument escaping at the boundary between user input and the subprocess call. The code path trusts confirmed input as safe by virtue of being user-approved, ignoring the threat model in which the proposed command itself is attacker-influenced through the LLM context.

Attack Vector

Exploitation is network-reachable when GPT-Pilot processes attacker-controlled prompts, repositories, or task descriptions that steer the LLM toward malicious command suggestions. A target developer who clicks through the confirmation dialog without auditing the command triggers code execution locally. See the GPT-Pilot project repository and the CVE-2026-31246 technical write-up for additional context.

// Vulnerability mechanism (prose description)
// Executor.run() receives confirmed_cmd from user prompt
// confirmed_cmd is passed unfiltered to:
//   asyncio.create_subprocess_shell(confirmed_cmd, ...)
// Shell metacharacters in confirmed_cmd execute as separate commands.

Detection Methods for CVE-2026-31246

Indicators of Compromise

Unexpected child processes spawned by the Python interpreter running GPT-Pilot, particularly sh, bash, cmd.exe, or powershell.exe with unusual arguments
Outbound network connections from the GPT-Pilot process to non-development infrastructure
New files written outside the active project directory by the GPT-Pilot user account

Detection Strategies

Hunt for process trees where python or gpt-pilot is the parent of shell interpreters executing chained commands containing ;, &&, or |
Inspect GPT-Pilot session logs for confirmed commands that diverge from the originally proposed command text
Correlate LLM API traffic with subsequent local subprocess executions to surface prompt-injection-driven payloads

Monitoring Recommendations

Enable command-line auditing on developer workstations running GPT-Pilot and forward events to a centralized log store
Alert on shell processes spawned by Python interpreters that initiate outbound TCP connections within 60 seconds
Track file integrity in user home directories and SSH key locations for changes initiated by the GPT-Pilot process

How to Mitigate CVE-2026-31246

Immediate Actions Required

Pin GPT-Pilot deployments to a patched commit released after 0819827ce20346ef5f25b3fe29293cb448840565 once available from the maintainers
Run GPT-Pilot inside a container or virtual machine with no access to credentials, SSH keys, or production networks
Treat every confirmation prompt as untrusted and manually audit each command before approval

Patch Information

At the time of publication, no fixed release tag is referenced in the NVD record. Monitor the Pythagora-io GPT-Pilot repository for commits that replace asyncio.create_subprocess_shell() with asyncio.create_subprocess_exec() and add allowlist validation of confirmed commands.

Workarounds

Execute GPT-Pilot under a dedicated low-privilege user account with no sudo rights and restricted filesystem access
Apply egress firewall rules limiting the GPT-Pilot host to required LLM API endpoints and package registries
Disable or wrap the command confirmation step to enforce a strict allowlist of binaries such as npm, pip, git, and reject any input containing shell metacharacters

bash

# Run GPT-Pilot in an isolated container with no host network or credentials
docker run --rm -it \
  --user 1000:1000 \
  --network none \
  --read-only \
  --tmpfs /tmp \
  -v "$(pwd)/project:/workspace" \
  -w /workspace \
  python:3.11-slim \
  bash -c "pip install --user gpt-pilot && gpt-pilot"