CVE-2026-121180
Description
A buffer overflow flaw was found in the Media 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 (2026-11-06) ---
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 checking on heap buffers during media processing in the Chromium Media component: upgrade to Chromium 157.0.8103.38+ (or the fixed Chromium builds), which corrects buffer bounds handling within the Media component to prevent heap memory corruption, closing crafted HTML page. Until patched, this is a concern on Chromium and Google Chrome users opening untrusted web content across all platforms, so restrict user access to untrusted web pages and unverified external links within the browser. As a compensating measure, Enforce Address Space Layout Randomization to hinder reliable memory gadget targeting, Enable heap allocator hardening to protect metadata and safe-linking pointers from corruption, Apply Landlock filesystem sandboxing to restrict filesystem access from renderer processes, Deploy EDR agents to monitor and detect suspicious post-exploitation activity from browser processes, Enforce NX/XD bit non-executable memory protections to block execution on heap pages, and Compile with Full RELRO and PIE to secure the Global Offset Table and randomize base addresses. These controls limit blast radius and contain exploitation, but they do not fix the underlying heap-based buffer overflow — apply the upstream patch to fully remediate.
Highest-impact CME: CME-116 FORTIFY_SOURCE (Buffer Overflow Detection) (high)
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Integrity,Confidentiality,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Modify Memory
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program's implicit security policy. Besides important user data, heap-based overflows can be used to overwrite function pointers that may be living in memory, pointing it to the attacker's code. Even in applications that do not explicitly use function pointers, the run-time will usually leave many in memory. For example, object methods in C++ are generally implemented using function pointers. Even in C programs, there is often a global offset table used by the underlying runtime.
Integrity,Confidentiality,Availability,Access Control,Other
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Other
When the consequence is arbitrary code execution, this can often be used to subvert any other security service.
Frequently Asked Questions
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