CVE-2026-79224 Overview
CVE-2026-79224 is a use-after-free vulnerability [CWE-416] in the Chromecast component of Google Chrome. The flaw affects Chrome versions prior to 152.0.7977.65. An attacker who has already compromised the renderer process can leverage this bug to execute arbitrary code outside the Chrome sandbox using a crafted HTML page. Google's Chromium security team rated the underlying issue as Critical severity. Successful exploitation breaks Chrome's process isolation model, giving an attacker access to the broader browser process context and, by extension, the host operating system.
Critical Impact
Successful exploitation enables sandbox escape and arbitrary code execution outside the Chrome renderer, expanding a renderer compromise into full browser-process code execution.
Affected Products
- Google Chrome desktop versions prior to 152.0.7977.65
- Chromium-based browsers incorporating vulnerable Chromecast code paths
- Downstream distributions that bundle affected Chromium releases
Discovery Timeline
- 2026-08-25 - CVE-2026-79224 published to the National Vulnerability Database
- 2026-08-27 - Last updated in the NVD database
Technical Details for CVE-2026-79224
Vulnerability Analysis
The vulnerability is a use-after-free condition in Chrome's Chromecast component. Use-after-free bugs occur when a program continues to access a memory region after it has been released. In browser contexts, an attacker can groom the heap to place attacker-controlled data at the freed location and then trigger the dangling reference to gain control over program execution.
This specific issue is reachable only after a prior renderer compromise. The Chromecast code path executes in a privileged context relative to the renderer sandbox. An attacker who already controls the renderer can send crafted messages or trigger Chromecast interactions from a malicious HTML page to reach the vulnerable object lifetime.
Because the affected code runs outside the renderer sandbox, exploitation converts a renderer-tier bug into code execution in a higher-privileged Chrome process. The scope change is what elevates the effective impact of the chain.
Root Cause
The root cause is improper object lifetime management inside the Chromecast component, where a reference to a heap object remains valid to callers after the underlying allocation has been freed. Google has not publicly released the source-level details. Chromium issue 516988476 tracks the internal fix.
Attack Vector
Exploitation requires user interaction and network delivery. The attacker hosts or injects a crafted HTML page that a user loads in Chrome. Independent access to the renderer process is a prerequisite, so the flaw is typically used as the second stage in an exploit chain that begins with a separate renderer vulnerability. The end result is arbitrary code execution outside the sandbox on the victim host.
No verified public exploit code is available for CVE-2026-79224. Technical details are tracked in the Chromium Issue Tracker #516988476 and the Google Chrome Stable Update advisory.
Detection Methods for CVE-2026-79224
Indicators of Compromise
- Chrome renderer or utility processes spawning unexpected child processes such as cmd.exe, powershell.exe, or shell interpreters
- Chrome writing executable content or scripts to user-writable paths shortly after visiting an untrusted page
- Anomalous outbound network connections initiated by Chrome to previously unseen infrastructure
- Chrome crash dumps referencing Chromecast-related modules or heap corruption signatures
Detection Strategies
- Deploy endpoint behavioral monitoring that flags Chrome processes performing post-exploitation actions such as process injection, credential access, or persistence writes
- Correlate Chrome crash telemetry with visits to newly registered or low-reputation domains
- Track installed Chrome versions across the fleet and alert on hosts running versions earlier than 152.0.7977.65
Monitoring Recommendations
- Ingest browser process telemetry into a central data lake and baseline child-process and network activity for Chrome
- Monitor for Chromecast-related error events and repeated renderer crashes as potential pre-exploitation signals
- Alert on execution of unsigned binaries or scripts whose parent process is a Chrome sub-process
How to Mitigate CVE-2026-79224
Immediate Actions Required
- Update Google Chrome to version 152.0.7977.65 or later on all managed endpoints
- Force-restart Chrome after the update so the patched binary is loaded across all profiles
- Audit third-party Chromium-based browsers and apply vendor updates that incorporate the upstream fix
Patch Information
Google addressed CVE-2026-79224 in the Chrome Stable channel release documented in the Google Chrome Stable Update. The fix ships in Chrome 152.0.7977.65 and later. Administrators managing Chrome through enterprise policy should confirm that auto-update is enabled and that the minimum version policy enforces the patched build.
Workarounds
- Restrict use of Chromecast features in enterprise environments where the functionality is not required
- Enforce Chrome enterprise policies that block navigation to untrusted domains and disable unnecessary media routing capabilities
- Apply application allow-listing to prevent Chrome sub-processes from launching interpreters or unsigned binaries
# Verify installed Chrome version on Linux/macOS hosts
google-chrome --version
# Windows: query the installed Chrome version from the registry
reg query "HKLM\SOFTWARE\Google\Chrome\BLBeacon" /v version
# Enforce a minimum Chrome version via enterprise policy (Windows registry)
reg add "HKLM\SOFTWARE\Policies\Google\Chrome" /v TargetVersionPrefix /t REG_SZ /d "152.0.7977.65" /f
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
