CVE-2026-87579 in Chrome
Summary
by MITRE • 09/09/2026
Buffer overflow in WebRTC in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified involves a buffer overflow within the WebRTC implementation of Google Chrome prior to version 153.0.8010.36, representing a critical memory safety failure that allows for arbitrary code execution under specific conditions. This flaw is classified as CWE-120, which denotes a classic buffer copy without checking size limits, leading to an overflow condition where more data is written into a fixed-size buffer than it can hold. The severity of this issue is rated as Medium by the Chromium security team, reflecting its potential for exploitation while acknowledging existing sandbox mitigations that may limit the immediate impact on system integrity.
The technical mechanism behind this vulnerability centers on improper handling of memory allocation and bounds checking within the WebRTC module. When a remote attacker crafts a malicious HTML page containing specially designed JavaScript or media stream data, they can trigger an overflow in the underlying C++ code responsible for processing real-time communication streams. This exploitation vector relies on the browser's default behavior of rendering web content with varying levels of trust, where the renderer process operates within a sandbox to restrict access to sensitive system resources. However, if the buffer overflow occurs before these protections are fully enforced or if it allows for control flow hijacking such as overwriting return addresses or function pointers, an attacker can bypass the sandbox boundary and execute arbitrary code with the privileges of the browser process.
From an operational perspective, this vulnerability poses a significant risk to users who visit compromised or maliciously crafted websites that utilize WebRTC features. The ability to execute arbitrary code inside the sandbox means that attackers could potentially escalate their privileges if they find additional vulnerabilities in adjacent processes or exploit weaknesses in the operating system's security model. This aligns with ATT&CK technique T1059, which covers command and script interpretation, as well as T1203 for exploitation of client software. The impact extends beyond simple data theft to include full compromise of the user environment, enabling further lateral movement within a network if the browser is used in an enterprise context or if additional malware is downloaded post-exploitation.
Mitigation strategies primarily involve updating Google Chrome to version 153.0.8010.36 or later, which includes patches for this memory safety issue. Organizations should enforce automatic update policies to ensure all endpoints are protected against known vulnerabilities in widely used browsers. Additionally, security teams can implement browser hardening techniques such as disabling unnecessary WebRTC features if they are not required for business operations, thereby reducing the attack surface. Network-level controls like web filtering and content security policies can also help prevent users from accessing malicious sites that attempt to exploit this flaw. Continuous monitoring of vulnerability databases and timely application of patches remain essential practices in maintaining a robust defense against such memory corruption vulnerabilities.