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PatchSiren cyber security CVE debrief

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11656 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11656

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

  • CVE-2026-11656 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11656

    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.