CVE-2025-9132 in Chrome
Summary
by MITRE • 08/20/2025
Out of bounds write in V8 in Google Chrome prior to 139.0.7258.138 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 08/21/2025
This vulnerability represents a critical heap corruption issue within the V8 JavaScript engine that powers Google Chrome and Chromium-based browsers. The out of bounds write flaw occurs when the engine processes malformed HTML content, allowing attackers to manipulate memory layout through carefully crafted web pages. The vulnerability exists in the V8 engine's handling of certain JavaScript operations that involve array manipulation or memory allocation patterns, where insufficient bounds checking permits writing data beyond allocated memory regions. This type of vulnerability falls under the Common Weakness Enumeration category CWE-787, which specifically addresses out-of-bounds write conditions that can lead to memory corruption and arbitrary code execution.
The operational impact of CVE-2025-9132 is significant as it enables remote code execution through web-based attacks without requiring user interaction beyond visiting a malicious website. Attackers can leverage this vulnerability to execute arbitrary code on affected systems, potentially leading to full system compromise, data exfiltration, or persistent backdoor installation. The exploitability is enhanced by the fact that it requires no user interaction beyond visiting a malicious page, making it particularly dangerous in phishing campaigns or drive-by download scenarios. The Chromium security severity classification of High indicates that this vulnerability can be reliably exploited by remote attackers and poses a substantial risk to users of affected browser versions.
The technical exploitation of this vulnerability involves crafting HTML content that triggers specific JavaScript operations within the V8 engine, causing it to write data beyond the bounds of allocated memory buffers. This memory corruption can overwrite adjacent memory regions, potentially corrupting critical data structures or function pointers that the JavaScript engine relies upon for proper operation. Attackers typically employ techniques such as heap spraying or information disclosure to gain more precise control over the memory corruption process, enabling them to redirect execution flow or inject malicious code. The vulnerability demonstrates the ongoing challenges in securing modern JavaScript engines where complex memory management and optimization techniques can introduce subtle flaws that are difficult to detect through traditional security testing methods.
Mitigation strategies for this vulnerability include immediate patching of Chrome browser versions prior to 139.0.7258.138, as well as implementing browser security features such as address space layout randomization and stack canaries. Organizations should also consider deploying web application firewalls and content security policies to reduce the attack surface and prevent exploitation of such vulnerabilities. The vulnerability highlights the importance of regular security updates and the need for comprehensive security testing of browser components. Additionally, users should be educated about the risks of visiting untrusted websites and the importance of keeping their browser software up to date with the latest security patches. This vulnerability aligns with ATT&CK technique T1059.007 for JavaScript execution and T1566 for social engineering via malicious websites, emphasizing the multi-layered approach required to defend against such sophisticated attacks.