CVE-2026-48056 Overview
Streambert is a cross-platform Electron desktop application for streaming and downloading video content. CVE-2026-48056 affects versions prior to 2.5.0 and stems from improper validation of executable paths passed to the run-download Inter-Process Communication (IPC) handler. A compromised renderer process can invoke this handler to execute arbitrary local binaries with the application's privileges. The maintainers released version 2.5.0 to address the flaw. The vulnerability carries a maximum CVSS score of 10.0 due to network attack vector, no privileges required, and scope change enabling full compromise of confidentiality, integrity, and availability.
Critical Impact
A compromised renderer process can invoke the run-download IPC handler to execute arbitrary local binaries with the Streambert application's privileges, resulting in full host compromise.
Affected Products
- Streambert Electron Desktop Application versions prior to 2.5.0
- Windows, macOS, and Linux distributions of Streambert built on the vulnerable Electron main-process code
- Streambert run-download IPC handler component
Discovery Timeline
- 2026-08-11 - CVE-2026-48056 published to NVD
- 2026-08-11 - Last updated in NVD database
- 2026-08-11 - GitHub Security Advisory GHSA-x267-77m6-qjc9 published alongside Streambert 2.5.0 release
Technical Details for CVE-2026-48056
Vulnerability Analysis
Streambert exposes a run-download IPC channel from its Electron main process to the renderer process. The handler accepts an executable path parameter but fails to validate or sanitize it against an allowlist of trusted binaries. This is classified as CWE-20 (Improper Input Validation).
Electron applications separate privileged main-process functionality from untrusted web content in the renderer. IPC handlers act as a security boundary between these tiers. When a handler blindly executes caller-supplied paths, that boundary collapses and any renderer compromise translates directly into arbitrary code execution on the host.
Exploitation is straightforward once a renderer is compromised through malicious streaming content, a cross-site scripting (XSS) vector, or a supply-chain injection. The attacker sends a crafted IPC message pointing at any local binary and Streambert launches it under the user's account.
Root Cause
The run-download IPC handler in Streambert versions prior to 2.5.0 does not enforce path validation, binary allowlisting, or signature verification before invoking the child process. Any string reaching the handler is treated as a legitimate downloader executable.
Attack Vector
An attacker first gains code execution inside the renderer, typically by delivering malicious video content or exploiting a rendering issue in embedded web views. The attacker then invokes the IPC channel with a chosen executable path. The Electron main process spawns that binary with the application's privileges, bypassing the renderer sandbox entirely.
No authentication is required, no user interaction is needed after initial content delivery, and the resulting execution scope extends beyond the browser context to the host operating system.
The GHSA-x267-77m6-qjc9 advisory documents the affected handler and remediation.
Detection Methods for CVE-2026-48056
Indicators of Compromise
- Streambert process spawning unexpected child processes such as cmd.exe, powershell.exe, /bin/sh, or arbitrary user-writable binaries
- Child process command lines originating from Streambert that reference paths outside the application install directory
- Outbound network connections from Streambert-launched child processes to unfamiliar hosts
Detection Strategies
- Monitor process ancestry where Streambert is the parent and correlate against a baseline of expected downloader binaries such as yt-dlp or ffmpeg
- Alert on Electron applications invoking shells or interpreters, which is uncommon during normal video download workflows
- Inspect Electron IPC telemetry where available for unusual run-download invocations referencing paths outside the app bundle
Monitoring Recommendations
- Maintain endpoint detection and response (EDR) rules that flag child-process creation events with parent image matching Streambert binaries
- Track file writes to user-writable directories immediately preceding execution by Streambert to catch stage-and-execute patterns
- Log and review all outbound connections initiated by processes descended from Streambert
How to Mitigate CVE-2026-48056
Immediate Actions Required
- Upgrade all Streambert installations to version 2.5.0 or later using the official 2.5.0 release
- Inventory endpoints to identify installations of Streambert versions prior to 2.5.0 and prioritize remediation
- Restrict Streambert execution to standard user accounts and remove unnecessary local administrator rights
Patch Information
Streambert 2.5.0 contains the fix. The maintainers hardened the run-download IPC handler to validate the executable path before invocation. Refer to the GHSA-x267-77m6-qjc9 security advisory for the patch details and to the 2.5.0 release notes for download artifacts.
Workarounds
- Uninstall Streambert versions prior to 2.5.0 if patching cannot be performed immediately
- Block Streambert binaries at the endpoint using application control policies until the update is applied
- Restrict outbound network access from Streambert to trusted content sources to reduce renderer compromise risk
# Verify installed Streambert version and remove vulnerable copies
# Linux example
streambert --version
# If version is below 2.5.0, remove the package or AppImage
rm -f ~/Applications/Streambert-*.AppImage
# Windows PowerShell example
Get-AppxPackage -Name '*Streambert*' | Select-Object Name, Version
# Uninstall via installer or:
# winget uninstall Streambert
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
