AIKIDO-2026-407703

libwebrtc is vulnerable to Information Disclosure

Information Disclosure Pre-CVE Published 2 days ago

Medium Risk

This Affects:

libwebrtc

0.3.0 - 0.3.42

Fixed in 0.3.43

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TL;DR

Affected versions of libwebrtc leak uninitialized heap memory through NativeVideoSource pre-capture keepalive frames. webrtc::I420Buffer::Create allocates pixel planes without initializing them, and until the first real capture_frame the source publishes that buffer every 100ms. Subscribers can therefore receive recycled process heap contents — often fragments of earlier video frames — decoded as the first keyframes. The fix introduces I420Buffer::new_black (SetBlack) and uses it for the keepalive buffer only.

Who does this affect?

You are affected if you are using a version that falls within the vulnerable range and publish video via NativeVideoSource on native (non-Wasm) targets, so pre-capture keepalive frames can reach remote subscribers before the first captured frame.