CVE-2026-12455 Overview
CVE-2026-12455 is a use-after-free vulnerability in the Tab Strip component of Google Chrome versions prior to 149.0.7827.155. A remote attacker who convinces a user to perform specific user interface gestures can trigger heap corruption through a crafted HTML page. Google rates the underlying Chromium issue as High severity. The flaw affects Chrome installations across Windows, macOS, and Linux desktop platforms. Successful exploitation can lead to arbitrary code execution within the renderer or browser process context, depending on the sandbox boundary reached. The weakness maps to [CWE-416: Use After Free].
Critical Impact
Remote attackers can corrupt heap memory and potentially execute arbitrary code by serving a crafted web page and inducing the victim to perform targeted UI interactions.
Affected Products
- Google Chrome prior to 149.0.7827.155
- Microsoft Windows desktop installations of Chrome
- Apple macOS and Linux installations of Chrome
Discovery Timeline
- 2026-06-17 - CVE-2026-12455 published to NVD
- 2026-06-18 - Last updated in NVD database
Technical Details for CVE-2026-12455
Vulnerability Analysis
The vulnerability resides in Chrome's Tab Strip, the browser-process component responsible for rendering and managing browser tabs. Use-after-free conditions occur when code continues to reference memory that has already been released back to the allocator. In this case, specific sequences of UI gestures cause the Tab Strip to dereference a freed object, leading to heap corruption.
An attacker hosts a crafted HTML page that influences tab state while the victim performs targeted UI actions. The interaction window required to trigger the dangling pointer raises attack complexity, but the consequences include memory disclosure and control-flow hijacking. Because Tab Strip executes in the privileged browser process rather than a sandboxed renderer, exploitation can yield higher-impact code execution than typical renderer bugs.
Root Cause
The defect stems from improper object lifetime management in the Tab Strip [CWE-416]. A reference to a Tab Strip object persists after the object's destructor runs, and a later UI event reuses the stale pointer. Once attacker-controlled data is reallocated into the freed slot, the dereference operates on attacker-influenced memory.
Attack Vector
Exploitation requires network delivery of a malicious page and user interaction with specific UI gestures such as tab dragging, closing, or reordering. The attacker cannot trigger the bug headlessly. Social engineering or convincing page content is needed to guide the victim through the gesture sequence that races the freed object against its reuse.
No public proof-of-concept is available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. Technical details are tracked in the Chromium Issue Tracker Entry.
Detection Methods for CVE-2026-12455
Indicators of Compromise
- Chrome browser process crashes referencing Tab Strip frames in crash dumps or chrome://crashes
- Unexpected renderer or browser process termination immediately following user tab interactions on a specific site
- Outbound connections to untrusted domains preceding Chrome instability on endpoints running versions prior to 149.0.7827.155
Detection Strategies
- Inventory installed Chrome versions across the fleet and flag any build below 149.0.7827.155
- Correlate browser crash telemetry with recent web navigation history to surface pages that consistently destabilize Chrome
- Hunt for child process spawns from chrome.exe that deviate from baseline behavior, such as command shells or script interpreters launched after a browsing session
Monitoring Recommendations
- Forward Chrome crash reports and EDR process telemetry to a central analytics platform for longitudinal review
- Monitor for execution of unsigned binaries written to user-writable paths shortly after Chrome activity
- Track Chrome auto-update status across endpoints to confirm timely deployment of 149.0.7827.155 or later
How to Mitigate CVE-2026-12455
Immediate Actions Required
- Update Google Chrome to version 149.0.7827.155 or later on all Windows, macOS, and Linux endpoints
- Restart Chrome on every managed device after the update to ensure the patched binary is loaded
- Validate enterprise update channels and policies to confirm Chrome auto-update is not disabled
Patch Information
Google released the fix in the Chrome Stable channel update documented in the Google Chrome Stable Update advisory. Administrators should deploy 149.0.7827.155 or later through Chrome Browser Cloud Management, Group Policy, MDM, or package management tooling.
Workarounds
- Restrict browsing to trusted sites through enterprise web filtering until the patch is fully deployed
- Educate users to avoid performing tab manipulation gestures on untrusted pages, particularly drag and reorder actions
- Enforce least-privilege user accounts so that any successful exploitation is contained to a non-administrative context
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
