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CVE-2026-63766 – Unauthenticated OS Command Injection / RCE – GPT-SoVITS through 20250606v2pro

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Summary

CVE-2026-63766 is a critical OS command injection vulnerability (CWE-78) in GPT-SoVITS, an open-source AI voice cloning and text-to-speech application developed by RVC-Boss. Affecting all versions through 20250606v2pro, the flaw enables unauthenticated remote attackers to execute arbitrary operating system commands on the server by submitting malicious input through the application’s Gradio web interface. The vulnerability carries a CVSS 4.0 score of 9.3 (Critical) and a CVSS 3.1 score of 9.8 (Critical).

Technical Details

  • Root cause: The ASR, slice, denoise, and uvr5 audio-processing functions in webui.py interpolate user-supplied Gradio textbox values directly into shell command strings, which are then executed via Python’s Popen(..., shell=True). The application’s only sanitization function, clean_path() in tools/my_utils.py, strips leading/trailing whitespace and quotes and normalizes path slashes, but does not remove shell metacharacters such as ;, $(), or backticks — leaving the injection vector fully open.
  • Trigger conditions: An attacker supplies a crafted directory path containing shell metacharacters (e.g., ; <command>) into any of the affected Gradio input fields (ASR input directory, slice root, denoise input, or UVR5 audio separation path). No credentials or prior access are required.
  • Attack vector: The GPT-SoVITS WebUI binds to 0.0.0.0 by default with no authentication enforced, making all processing endpoints reachable by any network client that can reach the configured port.
  • Impact: Successful exploitation results in arbitrary OS command execution as the server process user, granting the attacker full read/write access to the host file system and the ability to fully compromise the underlying server (complete confidentiality, integrity, and availability impact).

Affected Software

  • GPT-SoVITS (RVC-Boss): all versions through 20250606v2pro

Severity

  • CVSS 4.0: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  • CVSS 3.1: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and Recommended Actions

  • Patch: No vendor-released patch has been confirmed for CVE-2026-63766 as of July 20, 2026. Users should monitor the official GPT-SoVITS GitHub repository for a remediated release and apply it immediately upon availability.
  • Immediate workaround — restrict network exposure: Rebind the GPT-SoVITS WebUI to loopback (127.0.0.1) instead of 0.0.0.0, and enforce strict firewall or security-group rules to block all public internet access to the Gradio port. The service should only be reachable from trusted hosts or over an authenticated VPN/tunnel.
  • Do not expose the GPT-SoVITS WebUI directly to the internet under any circumstances until a patched version is released and deployed.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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