CVE-2026-126863
Description
An use after free flaw was found in the HTML component of the Chromium browser.
Upstream bug(s):
https://code.google.com/p/chromium/issues/detail?id=575312521 https://code.google.com/p/chromium/issues/detail?id=126863
Statement
Red Hat Product Security rates the severity of this flaw as determined by the Google Chrome Security Advisory.
Mitigation
Operational controls and environment hardening can partially reduce exposure:
1. Restrict browsing activity: Avoid navigating to untrusted websites or processing HTML files from unverified sources within chromium-browser.
2. Maintain sandboxing: Ensure chromium-browser is executed with its default sandbox protections active. Never pass the `--no-sandbox` command-line argument, as the sandbox restricts code execution from escaping into the broader operating system.
3. Remove the package if unneeded: On systems where web browsing is not strictly required, remove the chromium-browser package:
# dnf remove chromium-browser
Caveats:
Limiting web navigation may disrupt regular desktop workflows. Removing the package completely removes the browser application for local users.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
If the expired pointer is used in a read operation, an attacker might be able to control data read in by the application.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
If the expired pointer references a memory location that is not accessible to the product, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
If the expired pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.
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