CVE-2026-7999 Overview
CVE-2026-7999 is an information disclosure vulnerability in the V8 JavaScript engine used by Google Chrome versions prior to 148.0.7778.96. An inappropriate implementation in V8 allows a remote attacker to read potentially sensitive data from process memory through a crafted HTML page. Exploitation requires user interaction, typically loading an attacker-controlled web page. The Chromium project rated the underlying issue as Low severity, while NVD assigned a CVSS 3.1 base score of 4.3 (Medium). The flaw maps to CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Critical Impact
A remote attacker can leak fragments of Chrome renderer process memory by serving a crafted HTML page, potentially exposing tokens, URLs, or other in-memory secrets.
Affected Products
- Google Chrome desktop versions prior to 148.0.7778.96
- Chromium-based browsers shipping the same V8 engine build
- Embedded WebView and CEF runtimes built on vulnerable Chromium versions
Discovery Timeline
- 2026-05-06 - CVE-2026-7999 published to NVD
- 2026-05-06 - Last updated in NVD database
Technical Details for CVE-2026-7999
Vulnerability Analysis
The vulnerability resides in V8, the JavaScript and WebAssembly engine that powers Chrome's renderer process. An inappropriate implementation in V8 fails to fully constrain memory access during script execution. A remote attacker can exploit the issue by serving a crafted HTML page that triggers the flawed code path. The result is the disclosure of bytes from the renderer process address space to attacker-controlled JavaScript.
The attack does not grant code execution or write access. The confidentiality impact is limited to information accessible within the compromised renderer. However, modern web sessions often hold authentication tokens, cookies, and form data in renderer memory, which raises the practical value of even partial leaks.
Root Cause
The issue is classified under [CWE-200] and stems from V8 returning or exposing memory contents that should remain isolated. Inappropriate implementation typically refers to logic errors where an optimization, type assumption, or boundary check does not match the engine's security invariants. The fix shipped in Chrome 148.0.7778.96 corrects the V8 path that exposed the data.
Attack Vector
Exploitation occurs over the network and requires the victim to load attacker-controlled HTML. The attacker hosts a malicious page or injects JavaScript into a compromised site, then uses the V8 flaw to read memory accessible to the renderer. No privileges are required, and the scope remains unchanged. Cross-origin web content rendered in the same process is the most likely target for leaked data. See the Chromium Issue Tracker Entry and the Google Chrome Release Update for vendor details.
No public proof-of-concept code or verified exploit examples are available at the time of publication. The vulnerability mechanism is described in prose because no sanitized exploit has been released by the vendor or researchers.
Detection Methods for CVE-2026-7999
Indicators of Compromise
- Chrome processes loading unexpected origins followed by anomalous outbound traffic carrying base64 or hex-encoded blobs.
- Browser telemetry showing renderer crashes or V8 exceptions correlated with visits to untrusted domains.
- Endpoint logs revealing Chrome versions older than 148.0.7778.96 still running after the patch release date.
Detection Strategies
- Inventory installed Chrome and Chromium-based browser versions across the fleet and flag any build below 148.0.7778.96.
- Hunt for web traffic to newly registered or low-reputation domains delivering HTML and JavaScript to vulnerable browser versions.
- Correlate proxy or DNS logs with endpoint browser version data to prioritize hosts at risk of memory disclosure.
Monitoring Recommendations
- Enable browser update telemetry through enterprise management policies and alert on stalled updates.
- Forward browser process and network telemetry to a centralized data lake for cross-source correlation.
- Track exfiltration patterns where small, repeated payloads are sent from renderer processes to external endpoints.
How to Mitigate CVE-2026-7999
Immediate Actions Required
- Update Google Chrome to version 148.0.7778.96 or later on all Windows, macOS, and Linux endpoints.
- Update Chromium-based browsers and embedded WebView or CEF components to builds incorporating the patched V8 engine.
- Enforce browser auto-update through group policy or mobile device management to prevent regression.
Patch Information
Google addressed CVE-2026-7999 in the Chrome stable channel update referenced in the Google Chrome Release Update. The fix is included in Chrome 148.0.7778.96 and later. Downstream Chromium distributions should pick up the corresponding V8 patch from the upstream commit referenced in the Chromium Issue Tracker Entry.
Workarounds
- Restrict access to untrusted websites through enterprise web filtering until patches are deployed.
- Disable or restrict JavaScript on high-risk user populations through Chrome enterprise policies as a temporary control.
- Apply site isolation and strict process-per-site settings to reduce the value of any single renderer memory disclosure.
# Verify Chrome version on Linux endpoints
google-chrome --version
# Example Windows registry policy to enforce auto-update (administrative template)
# 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.
