Google Chrome: Memory corruption in OptimizationGuide allows sandboxed code execution
Summary
Google Chrome prior to 156.0.8078.47 contains a memory corruption flaw in the OptimizationGuide component. A remote attacker can craft an HTML page that may lead to arbitrary code execution inside the browser sandbox. The attack requires that a user visits the malicious page; the CVSS base score is 8.8 (High).
Affected
- Google Chrome prior to 156.0.8078.47
- Chromium-based products that include the affected Chromium code (Microsoft Edge, Debian chromium packages; check vendor advisories for details)
- Ubuntu chromium-browser packages are marked Not affected; Snap-based Chromium should be checked separately
Fixed in
- Google Chrome 156.0.8078.47 or later (Windows and Mac builds reported as 156.0.8078.48; later 156.x builds exist, use the latest)
- Exact fixed build per platform: Unknown.
- Debian chromium fixed package versions: Unknown.
Workaround
- No vendor workaround known.
- Chrome updates automatically; the update takes effect after the browser is restarted.
Exploitation
- No evidence of exploitation in the wild found (KEV listing unconfirmed).
- Public proof of concept: Not known.
- Google rates the issue Medium; CISA SSVC: Exploitation none, Automatable no, Technical impact total.
Our recommendation
- Verify that all Chrome, Edge and Chromium installations run version 156.0.8078.47 or later, preferably the latest 156.x build.
- Restart browsers so that pending updates take effect.
- Include Linux Chromium packages and Snap installations in the check.
- Prioritise the update on workstations, since the flaw is reachable by visiting a crafted web page.
- Re-check the Chrome advisory and the CISA KEV catalogue for changes.
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 Security Update Guide: CVE-2026-113064 msrc.microsoft.com
- Ubuntu CVE tracker: CVE-2026-113064 ubuntu.com
- NVD mirror via Vulners: CVE-2026-113064 vulners.com
- Debian mirror via Vulners: MS:CVE-2026-113064 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, 14:34.
Original description (NVD)
Memory corruption in OptimizationGuide in Google Chrome prior to 156.0.8078.47 allowed a remote attacker to potentially execute arbitrary code inside 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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