CVE-2026-55168

Description

Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.

Weakness classification

• CWE-59: Improper Link Resolution Before File Access ('Link Following')
• CWE-61: UNIX Symbolic Link (Symlink) Following

Primary references

• security-advisories@github.com
• security-advisories@github.com
• security-advisories@github.com
• security-advisories@github.com
• 134c704f-9b21-4f2e-91b3-4a467353bcc0