CVE-2026-11249 Overview
CVE-2026-11249 is a use-after-free vulnerability in the Network component of Google Chrome prior to version 149.0.7827.53. A remote attacker who has already compromised the renderer process can leverage this flaw to read potentially sensitive information from process memory. Exploitation requires user interaction, typically by enticing a victim to load a crafted HTML page. The weakness is classified under CWE-416 and was tracked by Google with Chromium security severity rated Low. The issue affects Chrome on Windows, macOS, and Linux desktop platforms.
Critical Impact
An attacker controlling the renderer process can disclose memory contents from a privileged Chrome process via a malicious web page, potentially leaking sensitive data across the sandbox boundary.
Affected Products
- Google Chrome versions prior to 149.0.7827.53
- Chrome desktop builds on Microsoft Windows, Apple macOS, and Linux
- Chromium-based browsers that incorporate the vulnerable Network component
Discovery Timeline
- 2026-06-05 - CVE-2026-11249 published to the National Vulnerability Database
- 2026-06-05 - Google publishes the Stable Channel Update for Desktop
- 2026-06-05 - Last updated in NVD database
Technical Details for CVE-2026-11249
Vulnerability Analysis
The defect resides in Chrome's Network stack, the subsystem responsible for handling HTTP, fetch, and resource loading inside the browser. A use-after-free condition occurs when code retains and dereferences a pointer to a heap object after that object has been freed. In this case, the dangling reference allows access to memory that may now hold unrelated data.
The vulnerability does not yield arbitrary code execution on its own. Instead, the advisory states that an attacker who has already compromised the renderer process can read sensitive bytes from process memory through a crafted HTML page. This positions the bug as a useful secondary primitive in a multi-stage exploit chain rather than a single-shot remote code execution flaw.
User interaction is required, consistent with the browser-loading attack surface, and the scope changes because the renderer reads data from a more privileged Network process context.
Root Cause
The root cause is improper object lifetime management in the Network component, where a reference to a freed allocation remains reachable. When the dangling pointer is dereferenced, the underlying memory may contain reused heap data, enabling information disclosure across logical trust boundaries inside Chrome.
Attack Vector
Exploitation requires two preconditions: an attacker-controlled renderer process and victim navigation to a crafted HTML page. Renderer compromise typically chains from a separate sandboxed bug. Once inside the renderer, the attacker triggers the specific Network API sequence that frees and then reuses the affected object, harvesting leaked memory contents. Refer to the Chromium Issue Tracker entry for upstream context.
// No public proof-of-concept is available.
// See the Chromium issue tracker for technical details once access restrictions are lifted.
Detection Methods for CVE-2026-11249
Indicators of Compromise
- Chrome processes loading unexpected child renderers or crashing with heap corruption signatures shortly after visiting untrusted pages
- Outbound network connections from renderer or Network service processes to attacker-controlled infrastructure following anomalous browser activity
- Endpoints running Chrome versions earlier than 149.0.7827.53 after the patch release window
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any host below 149.0.7827.53 as exposed
- Correlate browser crash telemetry with web navigation logs to surface repeated Network service faults that may indicate exploit attempts
- Monitor for renderer sandbox escapes or unusual inter-process behavior originating from chrome.exe child processes
Monitoring Recommendations
- Ingest Chrome update channel events and endpoint version data into a centralized log platform for ongoing patch verification
- Track DNS and TLS metadata for domains delivering obfuscated HTML payloads to browser clients
- Alert when browser processes spawn unexpected child binaries or perform memory-read operations consistent with post-exploitation
How to Mitigate CVE-2026-11249
Immediate Actions Required
- Update Google Chrome to version 149.0.7827.53 or later on Windows, macOS, and Linux endpoints
- Restart Chrome after the update so the patched Network service binary is loaded into memory
- Audit Chromium-based browsers and embedded browser frameworks for incorporation of the fix
Patch Information
Google addressed CVE-2026-11249 in the Chrome Stable Channel release announced in the Stable Channel Update for Desktop. The fix ships in Chrome 149.0.7827.53 and later. Administrators using managed deployments should push the update through enterprise channels and confirm version compliance through endpoint inventory.
Workarounds
- Restrict browsing to trusted sites using enterprise URL allowlists until patching is complete
- Enforce Chrome's Site Isolation and disable unnecessary extensions that increase renderer attack surface
- Apply network egress controls that limit browser processes from reaching unvetted domains
# Verify the installed Chrome version on Linux
google-chrome --version
# Windows: query installed version from the registry
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
