CVE-2026-17759 Overview
CVE-2026-17759 is an uninitialized memory use vulnerability in the Codecs component of Google Chrome prior to version 151.0.7922.72. A remote attacker can obtain potentially sensitive information from process memory by serving a crafted HTML page to a vulnerable browser. The Chromium project rated the security severity as Medium. The flaw is tracked under CWE-457: Use of Uninitialized Variable and affects the media codec code paths used during content decoding.
Critical Impact
Remote attackers can leak sensitive data from the Chrome renderer process memory by luring a user to a malicious page, exposing content that could aid further exploitation.
Affected Products
- Google Chrome versions prior to 151.0.7922.72
- Chromium-based browsers incorporating the affected codec code
- Desktop Stable channel builds of Chrome across supported platforms
Discovery Timeline
- 2026-07-30 - CVE-2026-17759 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-17759
Vulnerability Analysis
The vulnerability resides in Chrome's Codecs subsystem, which decodes media content embedded in web pages. Code paths in the codec logic read from a variable or memory region before it has been properly initialized. When an attacker supplies specifically shaped media data through a crafted HTML page, the decoder consumes uninitialized bytes from process memory during its normal processing routine.
Because the affected memory can contain remnants of prior allocations, an attacker may recover fragments of sensitive data. Leaked content may include pointers, tokens, or partial buffers previously used by the renderer. This class of leak is typically chained with other vulnerabilities to bypass Address Space Layout Randomization (ASLR) or otherwise weaken exploit mitigations.
Root Cause
The root cause is classified as [CWE-457: Use of Uninitialized Variable]. A code path in the codec implementation fails to initialize a buffer or structure member before use. Subsequent read operations return whatever data previously occupied that memory region, resulting in an information disclosure primitive rather than a memory safety crash.
Attack Vector
Exploitation requires a user to visit a malicious or compromised web page under attacker control. The crafted HTML page includes media content that triggers the vulnerable codec path. No authentication is required, and interaction is limited to normal browsing behavior. Additional technical details are tracked in the Chromium Issue Tracker Entry and the Google Chrome Release Update.
// No verified proof-of-concept code is publicly available for CVE-2026-17759.
// Exploitation requires a crafted HTML page that invokes the vulnerable codec
// code path to trigger a read of uninitialized process memory.
Detection Methods for CVE-2026-17759
Indicators of Compromise
- Chrome renderer processes running versions earlier than 151.0.7922.72 on managed endpoints.
- Browser telemetry showing navigation to pages hosting unexpected or malformed media resources.
- Unusual outbound HTTP or WebSocket traffic from browser processes following visits to untrusted media-rich sites.
Detection Strategies
- Inventory installed Chrome and Chromium-derivative versions across the fleet and flag builds below 151.0.7922.72.
- Correlate browser process telemetry with proxy or DNS logs to identify visits to low-reputation domains delivering media payloads.
- Monitor for anomalous child process activity or crashes originating from Chrome renderer processes handling media content.
Monitoring Recommendations
- Enable browser version reporting through enterprise management tools to detect unpatched installations.
- Ingest web proxy, DNS, and endpoint process logs into a centralized analytics platform for cross-source correlation.
- Alert on repeated Chrome renderer crashes or media decode errors that could indicate exploitation attempts.
How to Mitigate CVE-2026-17759
Immediate Actions Required
- Update Google Chrome to version 151.0.7922.72 or later on all endpoints.
- Enforce automatic browser updates through enterprise policy to close the exposure window.
- Restrict access to untrusted websites at the web proxy or secure web gateway until patching is confirmed.
Patch Information
Google addressed the vulnerability in the Stable channel desktop release documented in the Google Chrome Release Update. Users and administrators should upgrade to Chrome 151.0.7922.72 or later. Chromium-based browsers such as Microsoft Edge, Brave, Opera, and Vivaldi should be updated once their vendors ship builds incorporating the corresponding upstream fix.
Workarounds
- Deploy browser configuration policies that block or sandbox untrusted media content where feasible.
- Use site isolation and strict Content Security Policy (CSP) settings to limit the impact of any memory disclosure.
- Where patching is delayed, direct users to an alternative fully patched browser for high-risk browsing.
# Verify installed Chrome version on Linux endpoints
google-chrome --version
# Example Windows registry policy to enforce automatic updates
# HKLM\SOFTWARE\Policies\Google\Update
# UpdateDefault = 1 (Always allow updates)
# AutoUpdateCheckPeriodMinutes = 60
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
