Google Chrome: Memory corruption in SiteIsolation
Summary
Google Chrome before 156.0.8078.47 contains a memory corruption flaw in SiteIsolation, Chromium's mechanism for isolating websites in separate processes. A remote attacker can use a crafted HTML page to potentially execute arbitrary code inside the browser sandbox. The victim must open the page (user interaction), and the CVE text does not describe a full sandbox escape.
Affected
- Google Chrome (desktop) prior to 156.0.8078.47
- Third-party data (VulDB, not verified by vendor): up to 155.0.8059.84
- Chromium-based Microsoft Edge: affected through the shared Chromium code
- Ubuntu chromium-browser package: not affected (wrapper for the Chromium snap)
Fixed in
- Google Chrome 156.0.8078.47 or later (Linux per secondary sources; Windows/Mac possibly 156.0.8078.48, verify against the vendor advisory)
- Microsoft Edge: see MSRC entry (secondary source lists 156.0.4314.42, not confirmed)
- Ubuntu: refresh the Chromium snap
Workaround
Unknown beyond patching.
Exploitation
- No evidence of exploitation in the wild found; CISA KEV entry not confirmed
- No public proof-of-concept found; the Chromium bug is restricted
- CISA SSVC: exploitation none, automatable no, technical impact total
Our recommendation
- Update Chrome to 156.0.8078.47 or later on all endpoints this week, and verify the exact Windows/Mac build against the vendor advisory
- Ensure Chromium-based Edge is updated through its vendor channel
- On Ubuntu, refresh the Chromium snap instead of relying on apt
- Check managed endpoints for browsers that have not been relaunched after the update
- Apply the whole Chrome 156 update, since it contains other memory corruption fixes
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: CVE-2026-113281 msrc.microsoft.com
- Vulners CVE list entry vulners.com
- VulDB entry vuldb.com
- Ubuntu security notice ubuntu.com
- HKCERT security bulletin (Microsoft Edge) www.hkcert.org
- Strix CVE entry www.strix.ai
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, 12:14.
Original description (NVD)
Memory corruption in SiteIsolation in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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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