Google Chrome: Memory corruption in Sync allows code execution in sandbox
Summary
Google Chrome desktop versions before 156.0.8078.47 contain a memory corruption flaw in the Sync component, which syncs bookmarks, history and settings with a Google account. A remote attacker can execute arbitrary code inside the browser sandbox by luring a user to a crafted HTML page. The attack requires user interaction, and the public record does not describe a sandbox escape. Google rates the Chromium severity as Low, while the CVSS base score is 8.8.
Affected
- Google Chrome desktop builds prior to 156.0.8078.47
- Microsoft Edge (Chromium-based) is also reported as affected by the Chromium code, according to the research notes; verify against Microsoft's advisory
Fixed in
- Chrome 156 stable release of 20 October 2026, build 156.0.8078.47 or later (builds differ by platform: .47 or .48 on Windows and macOS)
- Newer stable builds have been released since; deploy the current stable build
- Debian issued fixes for chromium (DSA 6577-1, DLA 4853-1) according to a third-party listing; Ubuntu's chromium-browser package is a wrapper that installs the Chromium snap, so check the snap revision
Workaround
No workaround known. Updating Chrome and Edge is the mitigation.
Exploitation
- In the wild: Unknown. Not found in the sources reviewed.
- Public proof of concept: None found.
- CISA SSVC assessment: Exploitation none, automatable no, technical impact total.
Our recommendation
- Inventory Chrome and Edge versions on all endpoints and flag anything below 156.0.8078.47.
- Update to the current stable build and confirm auto-update is enabled, or push the update via MDM or group policy.
- Remind users not to open untrusted links.
- Check the CISA KEV catalogue and the Chrome release page again in about a week for changes in exploitation status.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Chrome Releases: Stable Channel Update for Desktop chromereleases.googleblog.com
- Chromium issue tracker issues.chromium.org
- Microsoft Security Update Guide msrc.microsoft.com
- Vulners CVE listing (NVD) vulners.com
- Ubuntu CVE tracker ubuntu.com
- Vulners CVE listing (CVELIST) vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 15:11.
Original description (NVD)
Memory corruption in Sync in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Low)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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