CVE-2026-9986
Description
An insufficient validation of untrusted input flaw was found in the OptimizationGuide component of the Chromium browser.
Upstream bug(s):
https://code.google.com/p/chromium/issues/detail?id=513028160
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context; Bypass Protection Mechanism
Attackers can sometimes bypass input validation schemes by finding inputs that appear to be safe, but will be dangerous when processed at a lower layer or by a downstream component. For example, a simple XSS protection mechanism might try to validate that an input has no "<script>" tags using case-sensitive matching (CWE-178), but since HTML is case-insensitive when processed by web browsers, an attacker could inject "<ScrIpT>" and trigger XSS (CWE-79).
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