CVE-2026-55168

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 6.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
47th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 21, 2026

Last Modified

September 30, 2026

Advisory Details (4)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v4.10.1

Patch available: runtipi/runtipi v4.10.1

https://github.com/runtipi/runtipi/releases/tag/v4.10.1
github_commit Patch Available

commit df529a211b05 (runtipi/runtipi)

Patch available: runtipi/runtipi v4.10.1-beta.1 (contains commit df529a211b05)

https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c
github_pr Patch Available

fix: harden backup restore against unsafe symlinks

Patch available: runtipi/runtipi v4.10.1-beta.1 (PR #2606 merged 2026-06-01)

https://github.com/runtipi/runtipi/pull/2606
githubMentions a patch (unverified)🟡 PoC Available

Authenticated arbitrary file write via backup restore symlink planting · Advisory · runtipi/runtipi · GitHub

https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 20:07 UTCEPSS rescore
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  1. 2026-09-26 15:59 UTCEPSS rescore
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  54. 2026-08-21 21:24 UTCEG score recompute
  55. 2026-08-21 20:44 UTCEG score recompute
  56. 2026-08-21 20:44 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55168?
CVE-2026-55168 is a medium vulnerability published on August 21, 2026. 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…
When was CVE-2026-55168 disclosed?
CVE-2026-55168 was first published on August 21, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55168 actively exploited?
CVE-2026-55168 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (47th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55168?
CVE-2026-55168 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55168?
A fix for CVE-2026-55168 is available: update to the fixed version the vendor names in its advisory.

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