What is CVE-2026-55168?

CVE-2026-55168 is a medium-severity vulnerability in Runtipi, classified under Improper Link Resolution Before File Access. CVSS score: 6.5/10. Published 2026-08-21.

How severe is CVE-2026-55168?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Runtipi

CVE-2026-55168

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.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H.

Affected products

Runtipi — versions < 4.10.1

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-55168?: CVE-2026-55168 is a medium-severity vulnerability in Runtipi, classified under Improper Link Resolution Before File Access. CVSS score: 6.5/10. Published 2026-08-21.
How severe is CVE-2026-55168?: Medium severity. CVSS v3 base score is 6.5 out of 10.