CVE-2026-121137
Description
A type confusion flaw was found in the DevTools 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 restrict untrusted DevTools interactions and isolate browser processes to prevent execution of attacker-supplied scripts within the DevTools context: upgrade to Google Chrome 157.0.8103.38 (or the fixed Chromium builds), which resolves the type confusion flaw in the DevTools component, closing all 2 injection vectors (crafted HTML page, social engineering). Until patched, this is a concern on all platforms running affected Chromium or Google Chrome browsers, so warn users against opening DevTools or following social engineering instructions to interact with developer tooling on untrusted or unknown web pages. As a compensating measure, Validate indirect call targets against expected function signatures using Control Flow Integrity to block hijacked control flow, Restrict JIT compilation and isolate the JavaScript runtime heap to constrain type confusion exploitation, and Deploy endpoint detection and response monitoring to detect anomalous post-exploitation behavior and sandboxed payload execution. These controls limit blast radius and contain exploitation, but they do not fix the underlying type confusion flaw — apply the upstream patch to fully remediate.
Highest-impact CME: CME-113 Control Flow Integrity (CFI / Shadow Call Stack) (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
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
