CVE-2026-121094
Description
A type confusion flaw was found in the V8 component of the Chromium browser.
Upstream bug(s):
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Mitigation
--- CME Mitigation Guidance (2026-11-04) ---
Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.
The highest-value action is to disable or restrict JIT compilation in V8 to eliminate the optimization phase where type confusion vulnerabilities are introduced and exploited: upgrade to Chromium 157.0.8103.38 (or the fixed Chromium builds), which resolves the type confusion vulnerability in the V8 engine (upstream implementation details restricted), closing all 2 injection vectors (crafted HTML page, crafted JavaScript execution). Until patched, this is a concern on all platforms where users open untrusted HTML pages or execute untrusted web content, so restrict browser access to trusted web destinations and prevent users from viewing untrusted or unverified HTML content. As a compensating measure, validate indirect branch targets using Control Flow Integrity and Shadow Call Stack to impede control-flow hijacking, monitor endpoint behavior using EDR to detect anomalous child process spawning from the browser renderer, enforce Address Space Layout Randomization to randomize memory layout and disrupt reliable pointer corruption, and enforce non-executable permissions on writable memory regions using the NX/XD bit to prevent execution of injected code. These controls limit blast radius and contain exploitation, but they do not fix the underlying type confusion defect — apply the upstream patch to fully remediate.
Highest-impact CME: CME-919 JIT Compiler Hardening (JIT Restriction / V8 Sandbox) (high)
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
When the product accesses the resource using an incompatible type, this could trigger logical errors because the resource does not have expected properties.
Availability,Integrity,Confidentiality
Technical Impact: Read Memory; Modify Memory; Execute Unauthorized Code or Commands; DoS: Crash, Exit, or Restart
If a memory buffer is accessed using an incompatible type, and the allocated buffer is smaller than the type that the code is attempting to access, then an attacker could read or write memory outside the bounds of the buffer, leading to a crash or possibly code execution.
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