Google Chrome: Improper input validation in ReadingList
Summary
Improper input validation in the ReadingList component of Google Chrome allows a remote attacker to potentially execute arbitrary code inside the browser sandbox. Exploitation requires that a user visits a crafted HTML page, for example a malicious or compromised website or link. Chromium rates the flaw High (CVSS 8.8); code execution is limited to the sandbox and does not by itself give full control over the system.
Affected
- Google Chrome prior to 156.0.8078.73
Fixed in
- Google Chrome 156.0.8078.73 or later (Stable update of 27 October 2026)
Workaround
Unknown. No workaround is described by the vendor; updating is the recommended fix.
Exploitation
- Not known to be exploited in the wild according to the sources.
- No public proof of concept found.
- CISA SSVC assessment: exploitation none, not automatable, total technical impact.
Our recommendation
- Check the Chrome version on all endpoints (chrome://version) and require 156.0.8078.73 or later.
- For managed fleets, confirm that automatic updates are enabled and not blocked by policies.
- Restart browsers after updating, as some updates only apply after a restart.
- Check whether other Chromium-based browsers on endpoints are updated as well.
- Monitor the Chromium issue and the vendor advisory 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 tracker issues.chromium.org
- CIS Advisory: Multiple vulnerabilities in Google Chrome www.cisecurity.org
- OffSeq Radar: CVE-2026-118343 radar.offseq.com
- BetaNews: Chrome and Firefox security patches betanews.com
- GitHub CVE tracker entry github.com
- CVE Threat Intelligence: CVE-2026-118343 cve.threatint.com
- MacUpdate: Google Chrome google-chrome.macupdate.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, 09:48.
Original description (NVD)
Improper input validation in ReadingList in Google Chrome prior to 156.0.8078.73 allowed a remote attacker to potentially execute arbitrary code inside 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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