Google Chrome: Memory corruption in Paint allows code execution outside sandbox
Summary
A memory corruption flaw in the Paint component of Google Chrome before 156.0.8078.73 can be triggered by a crafted HTML page. A remote attacker could potentially execute arbitrary code outside the browser sandbox. The attack requires that a user opens the crafted page and does not require authentication. Google rates the issue Medium; the NVD CVSS 9.6 score supplied with the data could not be verified against other sources.
Affected
- Google Chrome prior to 156.0.8078.73
- Desktop platforms (Windows, macOS, Linux); Android and iOS status unverified
Fixed in
- Google Chrome 156.0.8078.73 or later (Windows, macOS, Linux)
Workaround
- No workaround needed; apply the update.
- Until the update is applied, make users fully restart the browser after the update so the new version is active.
Exploitation
- No exploitation in the wild found at the time of research.
- No public proof of concept found.
- Not listed in CISA KEV.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
Our recommendation
- Check that all Chrome installations report version 156.0.8078.73 or later and that users have restarted the browser.
- Deploy the Chrome auto-update or a managed update routine across the fleet.
- Patch the whole Chrome batch of 27 October 2026, not only this CVE.
- Verify the CVSS score in the NVD record before using it for prioritisation.
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 entry issues.chromium.org
- Ubuntu security tracker CVE-2026-118312 ubuntu.com
- VulDB vulnerability 427603 vuldb.com
- OffSeq Radar threat entry radar.offseq.com
- SecurityWeek: Chrome and Firefox updates patch over 200 vulnerabilities www.securityweek.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, 22:05.
Original description (NVD)
Memory corruption in Paint 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: 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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