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CVE-2026-12034 is an insufficient input validation vulnerability in the Linux Toolkit Theming component of Google Chrome on Linux before version 149.0.7827.115. A remote attacker who has already compromised the renderer process could potentially use a malicious file to escape the Chrome sandbox. The specific vulnerable function and file-processing mechanism are not identified.
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No public exploit code observed for this vulnerability.
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9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity input-validation vulnerability in Google Chrome's Linux Toolkit Theming component could enable sandbox escape through a malicious file after an attacker has compromised the renderer process. The reference assigns a CVSS v3 base score of 8.3 and identifies affected Chromium packages. It recommends updating Chromium and related packages to 149.0.7827.114-1~deb12u1 or later.
A high-severity sandbox escape vulnerability in Google Chrome on Linux caused by insufficient validation of untrusted input in Linux Toolkit Theming.
A high-severity insufficient validation of untrusted input vulnerability in Chrome Linux Toolkit Theming.
A high-severity insufficient validation of untrusted input vulnerability in Chrome Linux Toolkit Theming.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.