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CVE-2026-11656 Google CVE debrief

CVE-2026-11656 is a use after free vulnerability in ServiceWorker in Google Chrome prior to 149.0.7827.103. An attacker who convinced a user to install a malicious extension could potentially perform a sandbox escape via a crafted Chrome Extension. The vulnerability has a CVSS score of 8.3 and is considered High severity by Chromium. The CVE was published on [cvePublishedAt] and last modified on [cveModifiedAt].

Vendor
Google
Product
Chrome
CVSS
HIGH 8.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Users of Google Chrome prior to version 149.0.7827.103, and administrators of systems where Google Chrome is installed.

Technical summary

The vulnerability is a use after free in ServiceWorker, which could allow an attacker to potentially perform a sandbox escape via a crafted Chrome Extension. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Defensive priority

High

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.103 or later.
  • Be cautious when installing extensions from untrusted sources.

Evidence notes

The CVE was published by the National Vulnerability Database (NVD) and has a trust class of official_vulnerability_database.

Official resources

CVE-2026-11656 was published on 2026-06-09T00:16:48.580Z and last modified on 2026-06-09T14:58:20.520Z.