High [CVE-2026-12457] Insufficient data validation in Extensions
This high-severity Red Hat Linux advisory covers CVE-2026-12457.
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Summary
Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.155 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: High) An insufficient data validation flaw was found in the Extensions component of the Chromium browser.
Upstream bug(s): Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N).
Weakness: CWE-653.
- < 149.0.7827.155
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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