CVE-2026-17673 in Chrome
Summary
by MITRE • 07/30/2026
Integer overflow in QUIC 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)
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Analysis
by VulDB Data Team • 07/30/2026
This vulnerability represents a critical integer overflow flaw within the QUIC protocol implementation in Google Chrome browsers, specifically affecting versions prior to 151.0.7922.72. The issue stems from improper handling of integer values during QUIC packet processing, creating a potential pathway for privilege escalation attacks. When an attacker successfully compromises the renderer process through a malicious HTML page, they can exploit this vulnerability to break out of the browser's sandbox protection mechanisms. The flaw falls under the CWE-190 category of Integer Overflow or Wraparound, which occurs when an integer value exceeds its maximum representable range and wraps around to a smaller value, potentially leading to unexpected behavior in memory allocation or buffer operations.
The operational impact of this vulnerability is severe as it transforms a typical browser-based attack vector into a sandbox escape opportunity. QUIC protocol implementation vulnerabilities are particularly dangerous because they can be triggered during normal web browsing operations through crafted HTML content that includes malicious QUIC packets. The Chromium security severity rating of High reflects the potential for remote code execution and complete system compromise when combined with successful renderer process exploitation. This vulnerability specifically targets the browser's networking stack, where QUIC handles high-performance network communication, making it a prime target for attackers seeking to bypass sandbox protections.
The attack scenario typically begins with an attacker compromising the renderer process through social engineering or drive-by downloads, followed by the execution of malicious HTML content that triggers the integer overflow in the QUIC implementation. Once triggered, the overflow can lead to memory corruption that allows attackers to manipulate program flow and potentially execute arbitrary code outside the restricted browser sandbox. This vulnerability aligns with ATT&CK techniques related to privilege escalation and sandbox evasion, specifically targeting the T1059 command and control and T1484 defense evasion sub-techniques. The exploitation requires a pre-existing compromise of the renderer process but provides a path to full system access.
Mitigation strategies include immediate upgrade to Chrome version 151.0.7922.72 or later, which contains the patched QUIC implementation that properly handles integer overflow conditions. Organizations should also implement network monitoring to detect unusual QUIC traffic patterns that might indicate exploitation attempts. Additional protective measures include enabling Content Security Policy headers, implementing strict browser hardening configurations, and maintaining updated threat intelligence feeds for emerging exploitation patterns targeting similar vulnerabilities. The fix typically involves proper bounds checking in integer arithmetic operations and ensuring that QUIC packet processing handles edge cases without overflow conditions that could lead to memory corruption or control flow manipulation.