# 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.

- **Severity:** High 8.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Aug 2026
- **Updated:** 19 Aug 2026
- **Also known as:** GHSA-v74h-2468-rxhh

## 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.

Weakness: CWE-73 (External Control of File Name or Path), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## 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.

## Is CVE-2026-52872 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52872 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-52872 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52872 exists.

Affected product: truelockmc streambert. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-52872/ (Markdown: https://insights.sbomify.com/CVE-2026-52872/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-52872
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-52872
- OSV: https://osv.dev/vulnerability/CVE-2026-52872

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-52872/
Summaries are generated and may contain mistakes; the official description above is the record.