CVE-2026-121210
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 JIT compilation or enforce V8 sandbox protections to neutralize type confusion exploitation within the V8 JavaScript engine: upgrade to Google Chrome 157.0.8103.38+ (or the fixed Chromium builds), which fixes a type confusion flaw in the V8 JavaScript engine to prevent arbitrary code execution within the browser sandbox, closing all 2 injection vectors (crafted HTML page, malicious JavaScript execution). Until patched, this is a concern on Chromium installations on all platforms processing untrusted web content, so Restrict user navigation to untrusted web pages and prevent delivery of untrusted JavaScript over the network. As a compensating measure, Restrict or disable JavaScript execution on untrusted sites to block malicious scripts from triggering the flaw. These controls limit blast radius and contain exploitation, but they do not fix the underlying V8 type confusion defect — apply the upstream patch to fully remediate.
Highest-impact CME: CME-1309 Script Engine Restriction (Sandbox / Disable) (medium)
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.
Frequently Asked Questions
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