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: 2026-06-13
Advisory published: 2026-06-11
Advisory updated: 2026-06-13

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).

Official resources

CVE-2026-12027 CVE record
CVE.org
CVE-2026-12027 NVD detail
NVD
Source item URL
nvd_modified
Mitigation or vendor reference
[email protected] - Vendor Advisory
Source reference
[email protected] - Issue Tracking, Permissions Required

CVE-2026-12027 was published on 2026-06-11T22:16:55.253Z and modified on 2026-06-13T00:26:43.830Z.