CVE-2021-42762: Debian Linux

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

BubblewrapLauncher.cpp in WebKitGTK and WPE WebKit before 2.34.1 allows a limited sandbox bypass that allows a sandboxed process to trick host processes into thinking the sandboxed process is not confined by the sandbox, by abusing VFS syscalls that manipulate its filesystem namespace. The impact is limited to host services that create UNIX sockets that WebKit mounts inside its sandbox, and the sandboxed process remains otherwise confined. NOTE: this is similar to CVE-2021-41133.

Affected products

• Debian Debian Linux: version 10.0 only; version 11.0 only
• Fedoraproject Fedora: version 33 only; version 34 only; version 35 only
• WebKitGTK WebKitGTK: before 2.34.1 (fixed in 2.34.1)
• Wpewebkit Wpe Webkit: before 2.34.1 (fixed in 2.34.1)

Published 2021-10-20. Last modified 2026-06-17.