CVE-2026-31990: OpenClaw: stageSandboxMedia destination symlink traversal can overwrite files outside sandbox workspace

Summary

stageSandboxMedia allowed destination symlink traversal during media staging, which could overwrite files outside the sandbox workspace root.

Impact

When sandbox media staging handled inbound files, destination writes under media/inbound were not destination-alias-safe. If a symlink existed in that destination path, the write could follow it and overwrite host files outside the intended sandbox workspace boundary.

Affected Packages / Versions

• Package: openclaw (npm)
• Latest published version checked: 2026.3.1
• Affected: <= 2026.3.1
• Patched versions: >= 2026.3.2 (released)

Root Cause

stageSandboxMedia validated source paths but wrote destination files with a direct copy path that did not enforce destination boundary/alias checks.

Remediation

The fix routes staging writes through root-scoped safe write primitives for both local and SCP-staged attachments, preventing destination symlink traversal escapes.

Fix Commit(s)

• 17ede52a4be3034f6ec4b883ac6b81ad0101558a