Historical catalog analysis: CISA added this entry on July 22, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-6558 is an improper input validation vulnerability (CWE-20) located within the ANGLE and GPU components of the Google Chromium project. The flaw could allow a remote attacker to perform a sandbox escape if a user interacts with a specially crafted HTML page.
Exposure and applicability
This vulnerability affects a wide array of web browsers built on the Chromium engine. Specifically, the source identifies Google Chrome, Microsoft Edge, and Opera as affected products. Because these browsers are ubiquitous across corporate workstations and virtual desktop infrastructures (VDI), the exposure surface is significant for any organization permitting general web browsing.
Remediation priorities
Our analysis suggests prioritizing updates based on the criticality of the asset and the user’s level of exposure to untrusted web content.
- Immediate Patching: Deploy vendor-provided updates for all Chromium-based browsers. This is the primary method to address the improper input validation flaw.
- Fleet Inventory: Identify all instances of Chromium-derived browsers across the environment, as some third-party applications may embed Chromium components that also require updating.
- Temporary Isolation: For systems where immediate patching is not feasible, restricting access to untrusted external websites could reduce the likelihood of a user loading the crafted HTML page required for exploitation.
How to validate remediation
Verification must move beyond simple version checks. While confirming the installed version matches or exceeds the patched release provided by the vendor is a necessary first step, it does not prove that the update was successfully applied to all active processes.
Defenders should verify that browser processes have been fully restarted to ensure the updated binaries are loaded into memory. In managed environments, this can be validated through endpoint management tools that report the actual running version of the executable rather than just the installed package version. For organizations utilizing cloud services, validation should include confirming that the service provider has applied the necessary mitigations in accordance with applicable guidance.
Limits and open questions
While the vulnerability is documented as a sandbox escape, the source does not provide details on what specific actions an attacker can perform once the sandbox is exited. Additionally, it remains unknown whether this vulnerability has been utilized by ransomware campaigns.
Residual risk persists if users are running multiple browser versions or if legacy embedded Chromium components remain unpatched within proprietary software. Because a sandbox escape bypasses a primary layer of browser security, the impact depends on other host-level protections in place to prevent subsequent privilege escalation or lateral movement.
Source and editorial note
CVE-2025-6558: Google Chromium ANGLE and GPU Improper Input Validation Vulnerability · Source date: July 22, 2025 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: July 25, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 08, 2026 at 00:25 UTC.
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