CVE-2026-3543 in Chrome
Summary
by MITRE • 03/04/2026
Inappropriate implementation in V8 in Google Chrome prior to 145.0.7632.159 allowed a remote attacker to potentially perform out of bounds memory access via a crafted HTML page. (Chromium security severity: High)
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 03/07/2026
The vulnerability identified as CVE-2026-3543 represents a critical memory safety issue within the V8 JavaScript engine that powers Google Chrome and other Chromium-based browsers. This flaw manifests as an inappropriate implementation that creates opportunities for remote attackers to execute out of bounds memory access operations. The vulnerability affects Chrome versions prior to 145.0.7632.159, making it a significant concern for users running outdated browser versions. The Chromium security severity classification of High indicates the potential for serious exploitation and system compromise.
The technical nature of this vulnerability stems from improper bounds checking within V8's memory management mechanisms when processing crafted HTML content. When a malicious webpage is loaded, the vulnerable code path fails to properly validate array indices or memory access boundaries, allowing an attacker to manipulate memory locations beyond their intended limits. This type of flaw typically occurs in JavaScript engines where complex memory allocation and garbage collection processes interact with user-supplied data. The vulnerability can be exploited through a variety of attack vectors including malicious web pages, embedded scripts, or even compromised websites that serve the crafted HTML content.
From an operational perspective, this vulnerability poses significant risks to user security and system integrity. Remote attackers can leverage this flaw to potentially execute arbitrary code on affected systems, bypass security restrictions, or gain unauthorized access to sensitive information. The out of bounds memory access could lead to memory corruption, which might be exploited to escalate privileges or redirect program execution flow. This type of vulnerability is particularly dangerous in modern browser environments where JavaScript engines handle complex operations and interact with system resources. The attack surface is broad since any user visiting a malicious webpage could be compromised, making this a widespread concern across internet users.
The exploitation of CVE-2026-3543 aligns with several ATT&CK framework techniques including T1059.007 for JavaScript execution and T1068 for privilege escalation. This vulnerability also maps to CWE-129, which covers improper validation of array indices, and CWE-787, which addresses out of bounds write operations. Organizations should prioritize immediate patching of affected Chrome versions to mitigate this risk. Security teams should implement network monitoring for suspicious web traffic patterns and consider browser hardening measures such as disabling unnecessary JavaScript features. Additionally, user education regarding safe browsing practices and the importance of keeping software updated remains crucial in defending against such exploitation vectors. Regular security assessments and vulnerability scanning should include checks for outdated browser versions to prevent exploitation of this and similar memory safety vulnerabilities.