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CVE-2026-11301 describes a low-severity vulnerability in Google Chrome’s LiveCaption feature. The issue stems from an inappropriate implementation that allows a remote attacker to trigger out-of-bounds memory access via maliciously crafted network traffic. LiveCaption is designed to automatically generate real-time captions for audio content, which involves processing external data streams. In versions prior to 149.0.7827.53, the feature fails to properly validate the size of data passed to it when handling certain network inputs. This oversight permits an attacker to induce an out-of-bounds read. While the Chromium security team classifies this as low severity, the underlying CWE-125 weakness represents a classic memory corruption flaw. By sending a specially crafted sequence of packets, an attacker could cause the LiveCaption component to access memory locations outside the bounds of the allocated buffer. This can lead to heap corruption, information disclosure, or even a browser crash. Exploitation requires user interaction, as the target must be lured to a malicious website or forced to receive specific network data. However, no additional privileges are needed, and the attack complexity is low. The official fix was deployed in Chrome version 149.0.7827.53, where the buffer validation logic was corrected. Administrators and users should update immediately, as the flaw could be chained with other vulnerabilities for more severe impact. The Chromium issue tracker and the Chrome Releases blog provide further technical details on the patch.
DailyCVE Form:
Platform: Chrome browser
Version: < 149.0.7827.53
Vulnerability : Out-of-bounds memory
Severity: Low / 8.8
date: June 4, 2026
Prediction: July 2, 2026
What Undercode Say:
Check Chrome version on Ubuntu/Debian google-chrome --version Update Chrome via stable channel sudo apt update && sudo apt upgrade google-chrome-stable Force Chrome to check for updates google-chrome --force-update Query specific version fix apt-cache policy google-chrome-stable | grep 149.0.7827.53
Example of malicious WebSocket payload (simplified)
import asyncio
import websockets
async def exploit():
async with websockets.connect("ws://target-ip:8080") as websocket:
Craft out-of-bounds inducing message for LiveCaption
oob_msg = b"\x41" 0x2000 Large buffer to trigger OOB
await websocket.send(oob_msg)
Trigger LiveCaption by sending audio stream
async def send_audio_stream():
async with websockets.connect("ws://target-ip:8080") as websocket:
audio_payload = b"RIFF\x00\x00\x00\x00WEBP..." Malformed WebM/WebP
await websocket.send(audio_payload)
Exploit:
Crafted network traffic forces LiveCaption to process oversized or malformed media data, leading to out-of-bounds reads. Attackers embed a hidden HTML5 audio element with a malicious WebSocket stream. The LiveCaption thread attempts to decode without bounds checking, granting attackers potential heap read primitives.
Protection:
Upgrade to Chrome 149.0.7827.53 or later. Disable LiveCaption via chrome://settings/captions if update is unavailable. Implement strict Content Security Policy (CSP) for untrusted origins. Use Endpoint Detection and Response (EDR) to monitor abnormal memory access patterns.
Impact:
Heap corruption, potential information disclosure, browser crash. However, due to low severity rating, remote code execution is unlikely without additional exploits.
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Sources:
Reported By: github.com
Extra Source Hub:
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