Google Chrome: Out-of-bounds write in Editing component
Summary
Google Chrome desktop versions before 156.0.8078.73 contain an out-of-bounds write in the Editing component. A remote attacker can potentially execute arbitrary code outside the Chrome sandbox by luring a user to a crafted HTML page. Exploitation requires that the user visits the page, but no authentication. NVD lists a CVSS score of 9.6 (Critical), while Red Hat rates it 8.8 (High).
Affected
- Google Chrome desktop versions prior to 156.0.8078.73
- Official CVE record affected range is unclear; the vendor fix version 156.0.8078.73 is used here
Fixed in
- Linux: 156.0.8078.73 or later
- Windows and Mac: 156.0.8078.73/.74 or later
- Newer builds reportedly exist (156.0.8078.79 or .80 on Windows and Mac); not verified against the vendor advisory
- Chromium-based browsers such as Microsoft Edge: fixes pending or to be checked separately
- Ubuntu: chromium-browser packages listed as not affected (Snap-based); Debian DSA 6592-1 referenced, version not verified
- ChromeOS: fixed version unknown
Workaround
None needed if Chrome is updated. No vendor workaround documented. The update takes effect after a browser restart.
Exploitation
- No evidence of in-the-wild exploitation found
- CISA SSVC: exploitation none, not automatable, total technical impact
- Not listed in CISA KEV
- No public proof-of-concept exploit found
- EPSS: 0.27 % (percentile 20)
Our recommendation
- Confirm all desktop Chrome installations run 156.0.8078.73 or later, preferably the newest 156.0.8078.x build
- Restart browsers after the update so that the fix takes effect
- Check Microsoft Edge and other Chromium-based browsers, and Linux Chromium packages, separately
- Prioritise this patch in managed fleets, since browsers are a common initial attack vector
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
- Red Hat CVE record via Vulners vulners.com
- Ubuntu security notice CVE-2026-118342 ubuntu.com
- Malwarebytes: Chrome and Firefox updates fix serious security flaws www.malwarebytes.com
- Chrome 156 security update fixes (ChromeGeek) www.chromegeek.com
- Chrome security update October 2026 (Sandbanks Digital) sandbanksdigital.com
- OffSeq Radar threat entry CVE-2026-118342 radar.offseq.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, 21:58.
Original description (NVD)
Out of bounds write in Editing 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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