CVE-2026-48046: Streambert Auto-Updater RCE Vulnerability

CVE-2026-48046 Overview

CVE-2026-48046 affects Streambert, a cross-platform Electron desktop application used to stream and download video content. Versions prior to 2.5.0 contain an unvalidated auto-updater URL that a compromised renderer process can abuse to instruct the main process to download and execute an arbitrary binary. Successful exploitation results in remote code execution (RCE) on the host running the vulnerable application. The maintainer released version 2.5.0 to address the flaw. The weakness maps to [CWE-494: Download of Code Without Integrity Check].

Critical Impact
A compromised renderer process can coerce Streambert's main process into fetching and executing an attacker-controlled binary, yielding full remote code execution on the user's system.

Affected Products

Streambert Electron Desktop Application versions prior to 2.5.0
Streambert distributions built from the truelockmc/streambert repository before the 2.5.0 release
All operating systems supported by the vulnerable Streambert builds (Windows, macOS, Linux)

Discovery Timeline

2026-08-11 - CVE-2026-48046 published to NVD
2026-08-13 - Last updated in NVD database

Technical Details for CVE-2026-48046

Vulnerability Analysis

Streambert's auto-updater accepts an update URL that is not validated against a trusted origin or integrity control. Electron applications separate privileges between a renderer process, which handles untrusted web content, and a main process, which holds full Node.js and operating system capabilities. When a renderer is compromised through untrusted content, script injection, or supply-chain content, it can send an IPC message that steers the main process to a hostile update endpoint. The main process then downloads the attacker's binary and launches it with the same privileges as the user running Streambert. The flaw falls under [CWE-494], download of code without an integrity check.

Root Cause

The root cause is missing validation of the auto-updater URL and missing verification of the downloaded artifact. The updater trusts input that originates from a lower-privileged renderer context and does not enforce an allowlisted update host, code signature check, or hash verification before execution.

Attack Vector

Exploitation requires an attacker to first influence the renderer process, for example through a cross-site scripting condition, a malicious remote page loaded by the app, or a compromised embedded resource. From that foothold, the attacker sends an IPC message that redirects the updater to a controlled server. The main process fetches the binary and executes it, completing remote code execution without further user interaction.

// No verified public exploit code is available for CVE-2026-48046.
// See the GHSA advisory for technical details:
// https://github.com/truelockmc/streambert/security/advisories/GHSA-vj74-r9xm-37mj

Detection Methods for CVE-2026-48046

Indicators of Compromise

Streambert processes issuing outbound HTTP or HTTPS requests to hosts that do not match the official Streambert release infrastructure on GitHub.
New executable files written under Streambert's application data or temporary directories, followed by immediate process execution.
Child processes spawned by the Streambert main process that are not signed by the expected publisher or do not match known release artifacts.

Detection Strategies

Alert on Streambert application binaries downloading executable content (.exe, .dmg, .AppImage, .zip containing binaries) from non-GitHub domains.
Monitor for execFile, spawn, or CreateProcess calls originating from Streambert against files placed in user-writable update paths.
Correlate renderer-to-main IPC activity with subsequent network fetches to detect anomalous update flows.

Monitoring Recommendations

Ingest endpoint process, file, and network telemetry into a centralized analytics platform to link Streambert update fetches with subsequent child process execution.
Track Streambert installations across the fleet and flag hosts still running versions below 2.5.0.
Enable DNS and proxy logging to identify Streambert traffic that resolves to unexpected update endpoints.

How to Mitigate CVE-2026-48046

Immediate Actions Required

Upgrade Streambert to version 2.5.0 or later on all endpoints where the application is installed.
Inventory endpoints for vulnerable Streambert builds and remove the application where it is not required for business use.
Restrict outbound network access from Streambert to the official GitHub release infrastructure until patching is complete.

Patch Information

The maintainer has released Streambert 2.5.0, which contains the fix for CVE-2026-48046. Refer to the GitHub StreamBERT Release 2.5.0 notes and the GitHub Security Advisory GHSA-vj74-r9xm-37mj for full remediation details.

Workarounds

Block Streambert's outbound access to arbitrary hosts using host firewall or egress proxy rules, permitting only the official release domain.
Uninstall Streambert on systems where an immediate upgrade to 2.5.0 is not feasible.
Enforce application allowlisting to prevent execution of unsigned binaries dropped into Streambert's update or temporary directories.

bash

# Example egress restriction (Linux nftables) limiting Streambert to GitHub release hosts
# Adjust user ID and destination set to match your environment
nft add rule inet filter output \
  meta skuid streambert_user \
  ip daddr != { 140.82.112.0/20, 185.199.108.0/22 } \
  drop