CVE-2026-2441: Critical Use-After-Free Vulnerability in Google Chromium CSS Engine
Google Chromium CSS contains a use-after-free vulnerability that could allow a remote attacker to potentially exploit heap corruption via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
FREQUENTLY ASKED
What is CVE-2026-2441 and why does it matter?
CVE-2026-2441 is a high-severity Use-After-Free vulnerability in the CSS engine of Google Chromium. This flaw is significant because it allows a remote attacker to execute arbitrary code within the browser's sandbox environment by tricking a user into visiting a specially crafted HTML page. With a CVSS score of 8.8, it represents a substantial risk to data confidentiality and system integrity.
Which versions of the product are affected?
The vulnerability affects versions of Google Chromium prior to 145.0.7632.75. Because Chromium serves as the foundational engine for several major web browsers, this security flaw impacts not only Google Chrome but also Microsoft Edge, Opera, and other Chromium-based browsers that have not yet integrated the necessary security updates.
Has a patch been released for CVE-2026-2441?
Yes, Google has released a security update to address this vulnerability. The fix is included in Chromium version 145.0.7632.75 and later. Users and administrators are urged to update their browsers immediately to the latest stable channel release to mitigate the risk of exploitation and ensure the security of their browsing environment.
What is the remediation deadline and what it means for compliance?
The remediation deadline for CVE-2026-2441 is March 10, 2026. For organizations following CISA Binding Operational Directive (BOD) 22-01, this date is a mandatory cutoff for applying the security patch. Failure to meet this deadline results in non-compliance and leaves the infrastructure exposed to active exploitation risks identified by federal cybersecurity authorities.
How to check if an instance or deployment is affected?
To check if your browser is affected, navigate to the 'About' section of your browser menu (e.g., Chrome > Help > About Google Chrome). If the version number is lower than 145.0.7632.75, the instance is vulnerable. For enterprise deployments, IT administrators should use endpoint management tools to audit all installed browser versions across the network against the 145.0.7632.75 benchmark.
Understanding the High-Severity Threat in Google Chromium
On February 17, 2026, a critical security advisory was finalized regarding CVE-2026-2441, a high-severity vulnerability within the Google Chromium CSS engine. This flaw, classified as a Use-After-Free (UAF) vulnerability, presents a significant risk to the millions of users and organizations relying on Chromium-based browsers. With a CVSS score of 8.8, the vulnerability underscores the persistent challenges in managing memory safety within complex software architectures like modern web browsers. The flaw allows for remote code execution (RCE) via a crafted HTML page, making it a priority for immediate remediation.
The urgency of this patch is highlighted by its inclusion in security catalogs with a mandatory remediation deadline of March 10, 2026. As an active exploitation risk, this vulnerability is not merely theoretical but represents a tangible threat vector that attackers can leverage to bypass security boundaries and compromise host systems through the browser renderer process.
To effectively defend against CVE-2026-2441, it is essential to understand its profile. The following table summarizes the core metrics associated with this vulnerability.
Field
Value
CVE ID
CVE-2026-2441
Affected Product & Versions
Google Chromium prior to 145.0.7632.75
CVSS Score & Severity
8.8 (HIGH)
CVSS Version
3.1
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
CWE IDs
CWE-416 (Use After Free)
Date Disclosed
2026-02-17
Remediation Deadline
2026-03-10
SSVC Exploitation status
active
Known Ransomware Use
Unknown
EPSS Score & Percentile
0.00409 (61.3%)
Patch Available
Yes (Version 145.0.7632.75)
Technical Deep Dive: The Mechanics of Use-After-Free in CSS
CWE-416: Memory Management Failures
CWE-416, or "Use After Free," is a type of memory corruption vulnerability that occurs when a program continues to use a pointer after the memory it points to has been deallocated (freed). In the context of C++—the primary language of the Chromium project—managing memory manually or through smart pointers is a complex task. When an object is deleted, its memory is returned to the heap for future use. If a reference to that object remains (a "dangling pointer") and the program attempts to access it, the behavior becomes undefined.
An attacker can exploit this by ensuring that the freed memory space is re-allocated with malicious data. When the program then uses the dangling pointer, it inadvertently executes or processes the attacker's data, leading to a hijack of the application's control flow.
The Role of the CSS Engine (Blink)
The Blink engine, Chromium's rendering engine, is responsible for converting HTML, CSS, and JavaScript into the visual experience users see. The CSS component specifically handles the construction of the CSS Object Model (CSSOM) and applies styling rules to the Document Object Model (DOM). This process involves highly dynamic memory allocation, as styles are added, removed, and recalculated in response to user actions or script executions.
CVE-2026-2441 exists within this styling logic. When processing a specifically crafted HTML page containing complex CSS rules, the engine fails to properly track the lifecycle of certain CSS-related objects. This leads to a situation where the renderer attempts to access an object that has already been destroyed during a style recalculation or layout phase.
The Attack Chain: From Crafted HTML to Memory Corruption
The attack chain for CVE-2026-2441 begins with a network-based delivery mechanism. Because the attack vector is "NETWORK" and the complexity is "LOW," a remote attacker does not need sophisticated infrastructure to launch an exploit. The only requirement is "USER INTERACTION," which usually involves tricking a victim into visiting a malicious website or clicking a link in a phishing email.
Once the victim's browser loads the crafted HTML page, the following sequence occurs:
Parsing: The browser parses the HTML and encounters malicious CSS structures designed to trigger specific memory allocation patterns.
Deallocation: A specific sequence of CSS property changes or DOM manipulations causes the CSS engine to free a targeted memory object.
Heap Grooming: The attacker’s script uses techniques to fill the recently freed memory with controlled, malicious data (often referred to as "heap spraying" or "grooming").
Triggering the UAF: The engine, following its normal logic, attempts to access the deallocated object. Instead of finding legitimate CSS data, it encounters the attacker's payload.
Execution: This access results in memory corruption, which can be leveraged to achieve arbitrary code execution (ACE).
The Sandbox and the Impact of Arbitrary Code Execution
Chromium utilizes a multi-process architecture where the renderer—the component handling CSS and HTML—runs within a highly restrictive sandbox. This sandbox is designed to prevent compromised processes from accessing the rest of the operating system. However, gaining RCE inside the sandbox is still a critical failure.
Inside the sandbox, an attacker can steal session cookies, capture user input (via keylogging within the page context), and potentially find further vulnerabilities to "escape" the sandbox and gain full control over the host machine. The "Technical Impact" is classified as "total" by SSVC because once memory is corrupted at this level, the integrity and confidentiality of all data processed by the browser are lost.
Who Is Affected: The Reach of the Chromium Ecosystem
The impact of CVE-2026-2441 extends far beyond Google Chrome. The Chromium project is the upstream source for many of the world's most popular web browsers. Organizations and individuals using the following products are at risk:
Google Chrome: All desktop platforms (Windows, macOS, Linux).
Microsoft Edge: The enterprise standard for many Windows environments.
Opera and Opera GX: Popular alternatives known for resource management.
Brave: A privacy-focused browser built on the Chromium core.
Vivaldi: A highly customizable Chromium-based browser.
Enterprise environments are particularly vulnerable because browsers are the primary interface for SaaS applications and internal web portals. A single unpatched browser can serve as the entry point for a wider corporate breach.
Compliance and Urgency: The CISA BOD 22-01 Mandate
Because CVE-2026-2441 has been identified as being under active exploitation, it has been added to the CISA Known Exploited Vulnerabilities (KEV) catalog. For federal agencies and organizations that align with Binding Operational Directive (BOD) 22-01, this mandates a strict remediation timeline.
The remediation deadline is March 10, 2026. By this date, all affected instances of Chromium-based browsers must be updated to version 145.0.7632.75 or higher. This directive reflects the high risk of this vulnerability being used in targeted attacks or ransomware campaigns. Even organizations not explicitly bound by CISA directives should treat this date as the maximum window for acceptable risk exposure.
Official Remediation Steps and Patch Verification
To mitigate the risk of CVE-2026-2441, follow these official remediation steps immediately:
Update Google Chrome:
Open Chrome and click on the three vertical dots in the top-right corner.
Navigate to Help > About Google Chrome.
The browser will automatically check for updates. Ensure the version is 145.0.7632.75 or later.
Relaunch the browser to apply the update.
Update Microsoft Edge:
Click the three dots in the top-right corner.
Select Help and feedback > About Microsoft Edge.
Allow the browser to update to the latest version and restart.
Enterprise Deployment:
Utilize tools such as Microsoft Endpoint Manager (Intune), Google Admin Console, or third-party patch management solutions (e.g., PDQ, Ivanti) to push the latest Chromium build to all endpoints.
Verify the update by auditing the version number across the fleet.
Reference Official Documentation:
Monitor the Chrome Releases Blog for subsequent stability updates and security fixes.
Security Best Practices for Browser Hardening
In addition to patching, organizations should adopt the following best practices to defend against memory corruption vulnerabilities:
Enable Automatic Updates: Configure group policies to ensure browsers update automatically without requiring user intervention. This reduces the time-to-patch for critical flaws.
Implement Site Isolation: Ensure that Chromium's "Site Isolation" feature is enabled. This places each website into its own dedicated process, making it harder for a compromised renderer to access data from other sites.
Leverage Attack Surface Reduction (ASR) Rules: Use security software to block the execution of potentially obfuscated scripts or unconventional HTML/CSS structures from unknown sources.
Use Endpoint Detection and Response (EDR): Deploy EDR solutions that can monitor for unusual child process creation or memory injection attempts originating from browser processes.
Educate Users: Since the vulnerability requires "USER INTERACTION," ongoing anti-phishing training is vital to help users recognize and avoid the malicious links that serve as the primary delivery mechanism for this exploit.
Network Filtering: Implement DNS and web filtering to block access to known malicious domains and recently registered domains often used in exploit delivery campaigns.