Google Chrome V8: Improper input validation allows code execution outside sandbox
Summary
A flaw in the V8 JavaScript engine of Google Chrome, caused by improper input validation, is rated Critical (CVSS 9.6). A remote attacker can potentially execute arbitrary code outside the browser sandbox by luring a user to a crafted HTML page. User interaction is required, so the risk mainly affects workstations where users open untrusted links.
Affected
- Google Chrome (desktop) before 156.0.8078.73
- Secondary sources report Windows, Mac and Linux
- The CVE record's affected range is inconsistent ("156.0.8078.73 to < 156.0.8078.73")
Fixed in
- Google Chrome 156.0.8078.73 (Windows, Mac, Linux, per secondary sources)
- Vendor release page was not directly verified
- Fixed versions for Android and iOS: Unknown.
Workaround
- Unknown. No vendor workaround found.
- Install the update; the browser must be relaunched afterwards.
Exploitation
- No known exploitation in the wild.
- Not listed in CISA KEV.
- No public proof of concept known.
- CISA SSVC: exploitation none, not automatable, total technical impact.
- A different V8 flaw with a similar description was exploited earlier in 2026 (separate CVE).
Our recommendation
- Update Google Chrome on all desktop systems to 156.0.8078.73 or later, and check the installed build number.
- Enforce the update through managed deployment (Chrome Enterprise or Google Update policies).
- Prioritise systems where users have local administrator rights.
- Verify that browsers were relaunched after the update.
- Monitor for unusual browser activity and recheck the CVSS score and EPSS value before reporting.
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 bug tracker issues.chromium.org
- CIS advisory: multiple vulnerabilities in Google Chrome www.cisecurity.org
- Ubuntu CVE tracker CVE-2026-118316 ubuntu.com
- VulDB entry 427604 vuldb.com
- Google Chrome package tracker (Ubuntu Updates) www.ubuntuupdates.org
- SecurityOnline: Chrome security update 156.0.8078.73 securityonline.info
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 30 Oct 2026, 22:01.
Original description (NVD)
Improper input validation in V8 in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code outside 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.