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PatchSiren cyber security CVE debrief

CVE-2026-9881 Google CVE debrief

A critical use-after-free vulnerability in Google Chrome's Bluetooth subsystem on macOS, fixed in version 148.0.7778.216. The flaw could enable sandbox escape via malicious Chrome extension installation.

Vendor
Google
Product
Chrome
CVSS
CRITICAL 9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-28
Original CVE updated
2026-07-21
Advisory published
2026-05-28
Advisory updated
2026-07-21

Who should care

macOS users running Google Chrome; organizations with Chrome browser deployments on Apple endpoints; security teams managing browser extension policies; incident responders investigating potential sandbox escape chains involving malicious extensions

Technical summary

CVE-2026-9881 is a use-after-free (CWE-416) vulnerability in the Bluetooth implementation of Google Chrome on macOS. The vulnerability exists in versions prior to 148.0.7778.216. An attacker could exploit this flaw by convincing a user to install a malicious Chrome extension, potentially achieving sandbox escape. The Chromium security team has assigned this a Critical severity rating. The vulnerability was addressed in the Chrome Stable Channel update released May 2026.

Defensive priority

critical

Recommended defensive actions

  • Update Google Chrome on macOS to version 148.0.7778.216 or later
  • Audit installed Chrome extensions and remove untrusted or unnecessary extensions
  • Restrict extension installation through enterprise policies where applicable
  • Monitor for unusual Bluetooth subsystem activity on managed macOS endpoints

Evidence notes

CVE published 2026-05-28; modified 2026-05-29. Chromium security severity rated Critical. Affects Chrome on Mac prior to 148.0.7778.216. CWE-416 (Use After Free) identified. No KEV listing. Vendor evidence from Google Chrome release notes and Chromium issue tracker.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9881 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9881

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-9881 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9881

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.