Google Chrome: Improper input validation in Compositing
Summary
Improper input validation in the Compositing component of Google Chrome prior to 156.0.8078.73 can be abused by a remote attacker via a crafted HTML page. Successful exploitation could allow arbitrary code execution outside the Chrome sandbox. The attacker needs the user to open the malicious page, for example through a compromised website or a phishing link. Chromium rates the issue as High, and the CVSS base score is 9.6 (Critical).
Affected
- Google Chrome prior to 156.0.8078.73 (Desktop, per CVE description)
Fixed in
- Google Chrome 156.0.8078.73 or later
- Windows and macOS: 156.0.8078.73/.74
- Linux: 156.0.8078.73
- Debian: DSA 6592-1 for Chromium (29 Oct 2026)
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild as of 27 Oct 2026.
- A third-party tracker lists the CVE as not in the CISA KEV catalogue (not checked directly).
- No public proof-of-concept found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
Our recommendation
- Update all Google Chrome installations to 156.0.8078.73 or later and verify the version on each device.
- Check managed devices and endpoints with blocked or delayed updates first.
- Patch the whole 27 Oct 2026 Chrome release, which contains further security fixes.
- Remind staff not to open links from unknown or untrusted sources.
- Check the vendor advisory before closing the item.
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 574030524 issues.chromium.org
- OffSeq Radar: CVE-2026-118332 radar.offseq.com
- Malware.news: Chrome and Firefox updates fix serious security flaws malware.news
- Ubuntu Updates: google-chrome-stable www.ubuntuupdates.org
- Vulners: RH:CVE-2026-118332 vulners.com
- VulDB: CVE-2026-118332 vuldb.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 30 Oct 2026, 22:00.
Original description (NVD)
Improper input validation in Compositing 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.
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