Google Chrome: Sandbox escape in WebAppInstalls on macOS
Summary
Google Chrome for macOS contains an incorrect reference resolution flaw in WebAppInstalls, the component that installs web applications. A remote attacker who has already compromised the renderer process can use crafted network traffic to execute arbitrary code outside the browser sandbox. The attack requires a separate browser exploit first and user interaction, and it is considered complex to execute.
Affected
- Google Chrome on macOS prior to 155.0.8059.39
- Windows and Linux Chrome are not named in the CVE record
Fixed in
- Google Chrome 155.0.8059.39 for macOS according to the Chrome Releases post of October 6, 2026
- Later Stable builds are available; install the current Stable release
- A third-party report names 154.0.8037.39 instead; verify the build number on the Chrome Releases page
- Debian: 155.0.8059.39-1~deb12u1 and 155.0.8059.39-1~deb13u1
- SUSE: chromium 155.0.8059.39-bp157.2.241.1 for SLES 15.7
Workaround
- No workaround is required where the update is applied.
- Ensure that Chrome auto-update works on all Mac endpoints.
Exploitation
- Not known to be exploited in the wild; not listed in CISA KEV.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No public proof of concept found.
Our recommendation
- Update Google Chrome on all Mac endpoints to the current Stable release.
- Check managed fleets and confirm that automatic updates are enabled.
- Include the update in normal patch cycles and monitor for further Chrome security updates.
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 559097675 issues.chromium.org
- Ubuntu Security: CVE-2026-106409 ubuntu.com
- OSV: DEBIAN-CVE-2026-106409 osv.dev
- SUSE CVE: CVE-2026-106409 vulners.com
- Tenable plugin 474171 www.tenable.com
- OpenCVE: CVE-2026-106409 app.opencve.io
- GBHackers: Chrome 155 security flaws gbhackers.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 1 Nov 2026, 14:03.
Original description (NVD)
Incorrect reference resolution in WebAppInstalls in Google Chrome on on Mac prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to execute arbitrary code outside the sandbox via crafted network traffic. (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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