CVE-2026-118332
Description
An improper input validation flaw was found in the Compositing 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 (2026-11-03) ---
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 enforce bounds and size limits on compositing data structures, layer dimensions, and IPC transfer quantities received from renderer processes: upgrade to Google Chrome 156.0.8078.73+ (or the fixed Chromium builds), which validates input parameters within the Compositing component to prevent sandbox escape and arbitrary code execution, closing crafted HTML page. Until patched, this is a concern on Chromium and Google Chrome users navigating to untrusted web content across all platforms, so Restrict users from navigating to untrusted web pages and isolate untrusted browsing sessions. As a compensating measure, Apply strict allowlists and structural validation to incoming compositing parameters across process boundaries before processing, Monitor via endpoint detection and response for anomalous process spawning or post-exploitation payloads executing outside the sandbox, Enable address space layout randomization on privileged browser and GPU processes to complicate code reuse exploitation, and Enforce non-executable memory permissions on browser process memory pages to block execution of shellcode injected into data segments. These controls limit blast radius and contain exploitation, but they do not fix the underlying improper input validation defect — apply the upstream patch to fully remediate.
Highest-impact CME: CME-1311 Input Size and Quantity Bounds Enforcement (high)
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
An attacker could provide unexpected values and cause a program crash or arbitrary control of resource allocation, leading to excessive consumption of resources such as memory and CPU.
Confidentiality
Technical Impact: Read Memory; Read Files or Directories
An attacker could read confidential data if they are able to control resource references.
Integrity,Confidentiality,Availability
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
An attacker could use malicious input to modify data or possibly alter control flow in unexpected ways, including arbitrary command execution.
Frequently Asked Questions
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