CVE-2026-52872 Streambert: Local File Exfiltration and Overwrite via Subtitle file: Protocol
A compromised renderer in Streambert can use file: URIs to copy or overwrite arbitrary local files, exposing sensitive data or modifying system files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-52872?
CVE-2026-52872 is a high-severity path traversal vulnerability in truelockmc streambert, published on 18 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Streambert is a cross-platform Electron Desktop App to stream and download video content. Prior to 2.5.0, the downloadSubtitleFile utility in src/ipc/downloads.js, reached through the run-download IPC channel, accepts a renderer-supplied subtitle url using the file: URI scheme and passes its decoded pathname to fs.copyFileSync. The renderer also controls downloadPath, which determines the destination path. A compromised renderer can therefore copy any file readable by the StreamBERT process into an attacker-chosen writable location, exposing sensitive local data, and can overwrite existing writable files. This vulnerability is fixed in 2.5.0.
Which versions are affected by CVE-2026-52872?
How do I fix CVE-2026-52872?
No fix has been published for CVE-2026-52872 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-52872 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52872 exists.
Sources
Also known as GHSA-v74h-2468-rxhh.