CVE-2026-87581 in Chrome
Summary
by MITRE • 09/09/2026
Use after free in Payments in Google Chrome prior to 153.0.8010.36 allowed a remote attacker leveraging social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as a use-after-free condition within Google Chrome's payment processing subsystem represents a critical memory safety flaw that undermines the browser's core isolation mechanisms. This specific defect occurs when an object is deallocated from memory but continues to be referenced by other parts of the application, leading to undefined behavior upon subsequent access. In this instance, the flaw resides in the code responsible for handling digital payments and transaction data structures within Chromium-based browsers prior to version 153.0.8010.36. The severity is classified as high because it directly impacts the integrity of the sandboxed environment that protects users from malicious web content.
The technical mechanism involves a lifecycle management error where pointers or references to payment-related objects are not properly invalidated after memory release. When an attacker crafts a specific HTML page containing JavaScript and other web technologies designed to trigger this race condition, they can manipulate the timing of object allocation and deallocation. By carefully controlling the state of these objects, the attacker forces the browser to access freed memory regions that may have been reallocated for different purposes or contain controlled data payloads. This allows the execution flow to be redirected away from safe boundaries into arbitrary code locations within the process space.
The operational impact is severe as it enables remote code execution outside the security sandbox. Typically, web content runs in a restricted environment with limited privileges to prevent access to local files, system configurations, or other sensitive data. However, by exploiting this use-after-free vulnerability through social engineering tactics such as phishing links or malicious advertisements, an attacker can escape these restrictions. Once arbitrary code is executed outside the sandbox, it gains elevated permissions equivalent to those of the user running the browser. This facilitates a wide range of post-exploitation activities including data theft, installation of persistent malware, and lateral movement within networked environments if the compromised machine serves as a gateway.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-416 which describes use after free errors resulting from improper memory management practices in software development. From an offensive security perspective, this exploit path corresponds to ATT&CK techniques involving initial access through spearphishing links and privilege escalation via sandbox escape mechanisms like T1055 or related process injection methods depending on the specific exploitation chain employed by the attacker community. The reliance on social engineering indicates that while the technical flaw is potent, successful attacks often require user interaction such as clicking a malicious link or visiting a compromised website designed to trigger the exploit automatically upon page load.
Mitigation strategies primarily involve immediate patching of all affected Chrome and Chromium-based browsers to version 153.0.8010.36 or later where these memory management issues have been resolved by developers through rigorous code review and automated fuzzing tests that detect such lifecycle violations before deployment. Organizations should enforce strict update policies across their endpoints to ensure timely application of security patches for browser components which are frequently targeted due to their widespread usage. Additionally, implementing advanced endpoint detection and response solutions can help identify anomalous behavior patterns associated with sandbox escape attempts even if the initial vulnerability is not immediately patched.
Security awareness training remains a crucial complementary defense layer given the social engineering component required for exploitation. Users should be educated on recognizing suspicious links and avoiding interaction with untrusted web content particularly when prompted to engage in payment-related activities or download files from unknown sources. Network segmentation can also limit the blast radius of any successful compromise by restricting outbound connections and limiting access to critical internal resources from user workstations running internet browsers. Continuous monitoring for indicators of compromise related to browser-based exploits ensures rapid detection and containment should a vulnerability be exploited before patches are applied.