CVE-2026-55086
CVE-2026-55086 · Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.
CVSS 4.2 · Medium · EPSS 0.1% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
etherpad
- Versions
- < 3.1.0: Affected
No fix published
ep_etherpad-lite npm
- Affected ranges
- SEMVER: < 3.1.0
Update to 3.1.0