Google Chrome: Improper input validation in Compositing
Summary
Google Chrome desktop versions before 156.0.8078.47 contain an improper input validation flaw (CWE-20) in the Compositing component. A remote attacker can create a crafted HTML page that could potentially execute arbitrary code outside the browser sandbox. The victim must open the page, and the attack would likely need to be combined with a further flaw to escape the sandbox, which has not been verified.
Affected
- Google Chrome desktop (Windows, macOS, Linux) prior to 156.0.8078.47 (per NVD/CNA wording)
- Vulnerable range listed differently by some aggregators; not fully reliable
- Chromium-based browsers such as Microsoft Edge depend on their own vendor updates
Fixed in
- Google Chrome 156.0.8078.47 or later (Linux)
- Google Chrome 156.0.8078.48 or later (Windows and macOS, per Wikipedia; exact fixed build not verified against Google's release post)
Workaround
- Unknown. No workaround found; updating is the mitigation.
- The browser must be fully restarted after the update.
Exploitation
- No public proof of concept found.
- No reports of in-the-wild exploitation found.
- CISA SSVC assessment: Exploitation none, Automatable no.
- Status of Chromium bug 499520020 unconfirmed.
Our recommendation
- Check every endpoint for Chrome 156.0.8078.47 or later (156.0.8078.48 on Windows and macOS) and confirm Chrome has been restarted.
- Check Microsoft Edge, Brave and other Chromium-based browsers against their vendors' advisories.
- Prioritise fleets that are not up to date, as the attack vector is remote and needs no authentication.
- Monitor the CISA KEV catalogue and the Chromium bug 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 499520020 issues.chromium.org
- Microsoft Security Update Guide: CVE-2026-113078 msrc.microsoft.com
- VulDB entry 424217 vuldb.com
- NVD record mirrored by Vulners vulners.com
- Ubuntu CVE tracker: CVE-2026-113078 ubuntu.com
- Cybersecurity News: Chrome security update fixing 353 flaws cybersecuritynews.com
- Google Chrome (Wikipedia) en.wikipedia.org
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, 22:37.
Original description (NVD)
Improper input validation in Compositing in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code outside 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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