CVE-2026-126916
Description
A flaw was found in chromium-browser. This flaw allows a remote attacker to achieve arbitrary code execution inside the browser sandbox by enticing a user to visit a crafted HTML page. The vulnerability is caused by an integer overflow in the V8 JavaScript engine during content processing.
Statement
This vulnerability is rated as Important rather than Critical because successful exploitation is confined within the application's renderer sandbox, preventing direct access to the underlying operating system without an accompanying sandbox escape. An unauthenticated remote attacker can trigger this flaw by convincing a user to navigate to malicious web content. In Red Hat Enterprise Linux workstation and desktop installations where Chromium is utilized, exploitation requires active user interaction, which prevents direct or automated network-based compromise.
Mitigation
Operational mitigation involves restricting exposure to untrusted web content and ensuring sandbox restrictions remain enforced:
1. Avoid visiting untrusted websites or following unverified links within the browser.
2. Ensure Chromium's built-in sandbox remains active and is never bypassed (do not launch the browser with flags that disable sandboxing).
Caveats:
These operational measures reduce the probability of encountering exploit vectors and restrict unauthorized execution to the isolated renderer process, but they do not eliminate the underlying defect when processing untrusted JavaScript.
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (Memory); DoS: Instability
This weakness can generally lead to undefined behavior and therefore crashes. When the calculated result is used for resource allocation, this weakness can cause too many (or too few) resources to be allocated, possibly enabling crashes if the product requests more resources than can be provided. If the calculated result involves time values, then the product might crash when it encounters a time that is less than the previously-calculated time.
Integrity
Technical Impact: Modify Memory
If the value in question is important to data (as opposed to flow), simple data corruption has occurred. Also, if the overflow/wraparound results in other conditions such as buffer overflows, further memory corruption may occur.
Confidentiality,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism
This weakness can sometimes trigger buffer overflows, which can be used to execute arbitrary code. This is usually outside the scope of the product's implicit security policy.
Availability,Other
Technical Impact: Alter Execution Logic; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
If the overflow/wraparound occurs in a loop index variable, this could cause the loop to terminate at the wrong time - too early, too late, or not at all (i.e., infinite loops). With too many iterations, some loops could consume too many resources such as memory, file handles, etc., possibly leading to a crash or other DoS.
Access Control
Technical Impact: Bypass Protection Mechanism
If integer values are used in security-critical decisions, such as calculating quotas or allocation limits, integer overflows can be used to cause an incorrect security decision.
Access Control
Technical Impact: Bypass Protection Mechanism; DoS: Crash, Exit, or Restart
If integer values are used in time-based, security-critical decisions, such as calculating expiration times or determining whether an event occurs within a specific time or date range, to cause an incorrect security decision. The consequences could even include "self-DoS" if the overflow produces a time value that is not accounted for in protection mechanism logic [REF-1570].
Frequently Asked Questions
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