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PatchSiren cyber security CVE debrief

CVE-2026-12027 Google CVE debrief

A critical vulnerability, CVE-2026-12027, was discovered in Google Chrome prior to version 149.0.7827.115. The issue is related to an inappropriate implementation in Headless, which could allow a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. This vulnerability has been assigned a CVSS score of 9.6, indicating a critical severity level.

Vendor
Google
Product
Chrome
CVSS
CRITICAL 9.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-06-23
Advisory published
2026-06-11
Advisory updated
2026-06-23

Who should care

Users of Google Chrome prior to version 149.0.7827.115 should update to the latest version to mitigate this vulnerability. Additionally, administrators and security teams responsible for managing Chrome deployments should prioritize patching to prevent potential sandbox escapes.

Technical summary

The vulnerability is caused by an inappropriate implementation in Headless in Google Chrome. This could allow a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Defensive priority

High

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.115 or later.
  • Review and apply the vendor advisory: [ref-4](https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01962725236.html).
  • Monitor issue tracking for additional information: [ref-5](https://issues.chromium.org/issues/517517155).

Evidence notes

The CVE record for CVE-2026-12027 can be found at [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-12027). The NVD detail page is available at [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-12027).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12027 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12027

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

  • CVE-2026-12027 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12027

    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.