CVE-2026-17678 in Chrome
Summary
by MITRE • 07/30/2026
Out of bounds read in ANGLE in Google Chrome prior to 151.0.7922.72 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical out-of-bounds read flaw in ANGLE graphics library component within Google Chrome browsers prior to version 151.0.7922.72. The issue stems from insufficient input validation during graphics processing operations where the ANGLE library fails to properly bounds-check memory accesses when handling crafted HTML content. This particular vulnerability is classified under CWE-129 as an Improper Validation of Array Index, specifically manifesting in improper bounds checking that allows memory access beyond allocated buffer boundaries.
The technical exploitation requires a remote attacker who has already compromised the renderer process through a separate initial attack vector, which aligns with the ATT&CK framework's technique T1059.007 for Process Injection and T1068 for Exploitation for Privilege Escalation. The vulnerability occurs during the processing of graphics commands where the ANGLE library does not validate the size or range of indices used in vertex buffer operations, allowing an attacker to craft malicious HTML content that triggers memory reads beyond valid buffer limits. This particular flaw is classified as a sandbox escape because it enables an attacker who has already achieved renderer process compromise to potentially break out of the restricted browser sandbox environment and gain elevated privileges.
The operational impact of this vulnerability extends far beyond simple data corruption, as it provides a pathway for attackers to escalate privileges from the compromised renderer process to system-level access. When an attacker successfully exploits this out-of-bounds read, they can potentially access sensitive memory regions that contain security-critical information such as cryptographic keys, authentication tokens, or other privileged data. The Chromium security severity rating of High indicates that this vulnerability has a significant impact on system security and could be leveraged in advanced persistent threat campaigns where attackers seek to establish persistent access to target systems.
Mitigation strategies for this vulnerability must focus on immediate browser updates to version 151.0.7922.72 or later, which contain the necessary patches to address the bounds-checking issues in the ANGLE library. Organizations should also implement additional protective measures including network segmentation, strict web content filtering, and monitoring for suspicious HTML content delivery. The patch addresses the vulnerability by implementing proper array index validation and adding bounds checking mechanisms that prevent memory access beyond allocated buffer boundaries. Security teams should also consider deploying exploit prevention technologies such as address space layout randomization, control flow integrity protections, and sandboxing enhancements to reduce the overall attack surface. This vulnerability highlights the critical importance of maintaining up-to-date software components, particularly graphics libraries that handle untrusted input from web content, as these components often represent high-value targets for privilege escalation attacks in modern browser security architectures.