CVE-2026-79013 Overview
CVE-2026-79013 is an improper input validation vulnerability in the Sync component of Google Chrome. Versions prior to 152.0.7977.65 fail to properly validate crafted network traffic sent to the Sync service. A remote attacker can exploit this weakness to obtain sensitive information from the affected browser.
The flaw is tracked under CWE-20: Improper Input Validation and was addressed in the Chrome Stable channel update. Google classifies the Chromium severity as Medium. No public proof-of-concept is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Critical Impact
A remote attacker sending crafted network traffic to Chrome's Sync component can disclose sensitive information handled by the browser's synchronization service.
Affected Products
- Google Chrome versions prior to 152.0.7977.65 (Desktop Stable channel)
- Chromium-based builds that incorporate the vulnerable Sync component
- All operating systems where the affected Chrome Desktop builds are distributed
Discovery Timeline
- 2026-08-25 - CVE-2026-79013 published to the National Vulnerability Database
- 2026-08-27 - Last updated in NVD database
Technical Details for CVE-2026-79013
Vulnerability Analysis
The vulnerability resides in Chrome's Sync subsystem, the component responsible for synchronizing bookmarks, history, passwords, and other profile data across devices. The Sync client processes messages exchanged with backend services over the network. Improper validation of these inputs allows an attacker to influence how Sync interprets protocol data.
By sending crafted network traffic to a targeted client, a remote attacker can trigger a code path that exposes sensitive information handled by Sync. The vulnerability affects confidentiality only, with no reported impact to integrity or availability. Exploitation does not require authentication or user interaction, though attack complexity is high, indicating specific network positioning or timing conditions are required.
For implementation-level context, refer to the Chromium Issue Tracker #513737209 and the Google Chrome Stable Update advisory.
Root Cause
The root cause is missing or insufficient validation of untrusted input received by the Sync component ([CWE-20]). Sync trusts fields in inbound messages without enforcing structural or semantic constraints. This lets malformed traffic drive the client into a state where internal data leaks back to the attacker.
Attack Vector
Exploitation requires an attacker positioned to deliver crafted network traffic to the Chrome Sync client. This can include a man-in-the-middle position, a compromised or hostile network path, or a controlled endpoint that the client contacts. No user interaction and no prior authentication are required. The verified code examples for this issue are not public; the vulnerability is described in prose based on the vendor advisory and Chromium tracker.
Detection Methods for CVE-2026-79013
Indicators of Compromise
- Chrome browser processes running versions earlier than 152.0.7977.65 on managed endpoints
- Anomalous or unexpected TLS connections from chrome.exe to non-Google endpoints resembling Sync backends
- Outbound flows to Chrome Sync destinations from clients where Sync is disabled by policy
Detection Strategies
- Inventory installed browser versions across the fleet and flag any Chrome instance below 152.0.7977.65.
- Monitor for TLS interception or certificate anomalies on paths used by Chrome Sync, since exploitation depends on delivering crafted network traffic.
- Correlate browser version telemetry with EDR process metadata to identify unpatched hosts that have active Sync sessions.
Monitoring Recommendations
- Ingest browser version and update status into a central data lake for continuous version drift monitoring.
- Alert on network egress from Chrome processes to unexpected hosts on ports associated with Sync traffic.
- Track the Google Chrome release notes for further advisories referencing the Sync component.
How to Mitigate CVE-2026-79013
Immediate Actions Required
- Update Google Chrome Desktop to version 152.0.7977.65 or later on all managed endpoints.
- Force a browser relaunch after the update so the patched Sync client is loaded into memory.
- Verify that automatic updates are enabled and functioning in enterprise policy configurations.
Patch Information
Google addressed CVE-2026-79013 in the Chrome Stable channel release documented in the Stable Channel Update for Desktop. Administrators should deploy Chrome 152.0.7977.65 or newer through their standard software distribution mechanism. Chromium-based downstream browsers should apply the corresponding upstream fix once merged.
Workarounds
- Disable Chrome Sync via the SyncDisabled enterprise policy on endpoints that cannot be updated immediately.
- Restrict browser network paths to trusted egress points to reduce exposure to crafted traffic scenarios.
- Enforce HSTS and strict certificate validation on the network to limit man-in-the-middle positioning.
# Example: disable Chrome Sync via enterprise policy on Windows
# HKLM\Software\Policies\Google\Chrome\SyncDisabled = 1
reg add "HKLM\Software\Policies\Google\Chrome" /v SyncDisabled /t REG_DWORD /d 1 /f
# Verify installed Chrome version on Windows
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
