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GHSA-25gx-x37c-7pph

HighCVSS 7.7 / 10
Published Mar 3, 2026·Last modified Mar 30, 2026
Affected Components(0)

No affected components available

Description

The sandbox browser entrypoint launched x11vnc without authentication (-nopw) for noVNC observer sessions.

OpenClaw-managed runtime flow publishes the noVNC port to host loopback only (127.0.0.1), so default exposure is local to the host unless operators explicitly expose the port more broadly (or run the image standalone with broad port publishing).

Affected Packages / Versions

  • Package: docker/openclaw
  • Affected: <= 2026.2.19-2
  • Patched: >= 2026.2.21

Technical details

  • scripts/sandbox-browser-entrypoint.sh used x11vnc ... -nopw for noVNC observer flow.
  • websockify exposed noVNC for the container listener.
  • OpenClaw runtime (src/agents/sandbox/browser.ts) already mapped host publish to loopback, but observer auth was missing.

Fix

  • Require VNC password auth in the sandbox browser entrypoint (x11vnc -rfbauth), replacing -nopw.
  • Generate per-container noVNC password in runtime and inject OPENCLAW_BROWSER_NOVNC_PASSWORD.
  • Emit short-lived noVNC observer token URLs instead of sharing raw noVNC passwords in shared URLs.
  • Keep loopback-only host port publish and bump sandbox browser security hash epoch.
  • Add security audit findings for sandbox browser containers that publish ports on non-loopback interfaces.

Operational note: rebuild the sandbox browser image and recreate browser containers so existing containers pick up the fix.

Fix Commit(s)

  • 621d8e1312482f122f18c43c72c67211b141da01
  • 8c1518f0f3e0533593cd2dec3a46c9b746753661

Release Process Note

Patched version is pre-set to the planned next release (2026.2.21). After npm release, this advisory can be published without further field edits.

OpenClaw thanks @TerminalsandCoffee for reporting.

Risk Scores
Base Score
7.7

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
7.1

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.51%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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