Google Chrome: Use after free in SiteIsolation allows sandbox code execution
Summary
Google Chrome versions before 156.0.8078.47 contain a use-after-free vulnerability (CWE-416) in SiteIsolation, Chrome's process isolation component. A remote attacker can execute arbitrary code inside the browser sandbox by luring a user to a crafted HTML page. The CVSS base score is 8.8 (High), and user interaction, such as opening the page, is required.
Affected
- Google Chrome (desktop) prior to 156.0.8078.47
- Chromium-based browsers that include the affected Chromium code (status varies by vendor)
Fixed in
- Google Chrome 156.0.8078.47 or later (Stable channel, released 20 October 2026)
- Newer Stable builds are available; deploy the latest Stable build from the official channel
- Debian has issued chromium updates (DSA 6577-1, DLA 4853-1)
Workaround
Unknown. No workaround has been documented; updating is the only documented remedy.
Exploitation
- No evidence of exploitation in the wild found at time of research
- No public proof-of-concept found
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total
- Reported by an external researcher and awarded by Google
Our recommendation
- Update Google Chrome and other Chromium-based browsers to at least 156.0.8078.47, preferably the latest Stable build
- Check managed browser fleets for outdated installations, as some devices may update later
- Verify installed versions against the Google Chrome Releases post
- Ensure browsers are set to update automatically and monitor for further updates
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 MSRC update guide msrc.microsoft.com
- Vulners NVD record vulners.com
- Ubuntu security tracker ubuntu.com
- Vulners Debian listing 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, 14:08.
Original description (NVD)
Use after free in SiteIsolation 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: High)
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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