PatchSiren cyber security CVE debrief

CVE-2026-12034 Google CVE debrief

CVE-2026-12034 is a High-severity vulnerability in Google Chrome on Linux. Insufficient validation of untrusted input in Linux Toolkit Theming allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a malicious file. The vulnerability was published on [cvePublishedAt] and modified on [cveModifiedAt].

Vendor: Google
Product: Chrome
CVSS: HIGH 8.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-06-11
Original CVE updated: 2026-06-12
Advisory published: 2026-06-11
Advisory updated: 2026-06-12

Who should care

Users of Google Chrome on Linux prior to version 149.0.7827.115 should update to the latest version to mitigate this vulnerability.

Technical summary

The vulnerability has a CVSS score of 8.3 and is classified as High severity. The CVSS vector is CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H. The weakness is related to CWE-20.

Defensive priority

High

Recommended defensive actions

Update Google Chrome to version 149.0.7827.115 or later.
Refer to [ref-4] for mitigation or vendor reference.
Refer to [ref-5] for additional information.

Evidence notes

Evidence from NVD and CVE.org.

Sources and references

Verified primary and authoritative sources

CVE-2026-12034 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-12034

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-12034 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12034

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

Supplemental references

Mitigation or vendor reference
Unverified legacy reference

URL: https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_01962725236.html

[email protected] - Vendor Advisory
Source reference
Unverified legacy reference

URL: https://issues.chromium.org/issues/519258799

[email protected] - Issue Tracking, Permissions Required

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.