Vulnerability · Published Aug 27, 2026 · Assigned by GitHub_M
CVE-2026-53580Trilium arbitrary file read and denial of service via file:// URLs in the automatic image-download feature
High 8.1
In plain English
A high-severity uncontrolled resource consumption in Trilium from TriliumNext. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Official description
Trilium is an open-source hierarchical note-taking application. In versions prior to 0.104.0, the automatic image-download feature accepts file:// URLs in a note's img tags and reads the referenced local file with no path validation, allowing any authenticated user to disclose arbitrary files readable by the Trilium process. When a text note is saved, Trilium scans its HTML for image sources and downloads each external one; because the HTML sanitizer keeps file as an allowed scheme, a source such as file:///etc/passwd is passed straight to a filesystem read and its contents are stored as a note attachment the user can then retrieve. Pointing the same primitive at an unbounded source such as /dev/zero causes uncontrolled memory allocation that crashes the server process. The feature is enabled by default and is reachable through the web UI, the ETAPI, the web clipper, and note imports, requiring only an authenticated session or an ETAPI token. This issue is fixed in version 0.104.0
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| TriliumNext | Trilium | < 0.104.0 |
Weakness: CWE-73, CWE-400, CWE-552 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H