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CVE-2026-17763 is a medium-severity vulnerability in Google Chrome that stems from an inappropriate implementation within the browser’s GPU subsystem. The flaw exists in Chrome versions prior to 151.0.7922.72 and allows a remote attacker who has already compromised the renderer process to leak cross-origin data via a crafted HTML page.
Chrome employs a multi-process architecture where the GPU process handles graphics commands from multiple renderer processes. Under normal operation, cross-origin isolation mechanisms ensure that a renderer process from one origin cannot access data belonging to another origin. However, the vulnerability arises because the GPU process does not adequately enforce origin-based checks when processing certain internal buffers, textures, or shared memory regions.
When an attacker compromises the renderer process, they gain the ability to send crafted WebGL or GPU commands to the GPU process. These commands are designed to reference memory that was allocated for rendering content from a different origin—for example, a victim bank website loaded in a hidden iframe. Because the GPU process lacks proper per-command origin validation, it processes the attacker’s malicious commands and returns pixel data or buffer contents belonging to the victim origin back to the attacker.
The vulnerability effectively bypasses the Same-Origin Policy (SOP), which is a cornerstone of web security. The attack does not require additional user interaction beyond visiting a malicious page, but it does depend on the attacker first gaining execution privileges within the renderer process—typically through another vulnerability. This makes it a powerful post-exploitation tool that can transform a limited renderer compromise into a full cross-origin data exfiltration capability.
The flaw is classified as an information exposure issue (CWE-200) and an improper access control issue (CWE-284), and it aligns with MITRE ATT&CK techniques T1557 (Adversary-in-the-Middle) and T1071.004 (Application Layer Protocol: DNS). The Chromium security severity is Medium, reflecting the specialized nature of the attack vector that requires prior process compromise. The CISA-ADP has assigned a CVSS v3.1 base score of 4.3 (Medium) with the vector AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
DailyCVE Form:
Platform: Google Chrome
Version: < 151.0.7922.72
Vulnerability: Cross-origin data leak
Severity: Medium (CVSS 4.3)
date: 2026-07-29
Prediction: 2026-07-30 (already patched)
What Undercode Say:
Analytics from the CVE-2026-17763 report indicate that Google patched a total of 370 vulnerabilities in the Chrome 151 update, including seven critical-severity bugs. Of these, 170 were medium-severity weaknesses like CVE-2026-17763. Google found 349 of the newly fixed security defects internally and credited external researchers for reporting 21 issues, paying $58,500 in bug bounty rewards. The GPU component and ANGLE (the WebGL backend) received particular attention, with 30 of the resolved vulnerabilities impacting ANGLE alone. Security teams should monitor for anomalous GPU activity patterns and implement strict Content Security Policies (CSP) to limit cross-origin resource access. Below are relevant commands and detection rules:
Check current Chrome version google-chrome --version Check for available updates (Debian/Ubuntu) sudo apt update && sudo apt upgrade google-chrome-stable Check for available updates (Windows via PowerShell) (Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion Network monitoring for unusual GPU-related traffic (example Snort rule) alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS \ (msg:"Possible CVE-2026-17763 GPU data exfiltration"; \ content:"cross-origin"; http_header; sid:1000001;)
Exploit:
To exploit CVE-2026-17763, an attacker must first compromise the renderer process through another vulnerability (e.g., a use-after-free or type confusion bug). Once renderer code execution is achieved, the attacker loads a hidden iframe pointing to a victim origin (e.g., `https://bank.com`). The attacker then issues crafted WebGL/GPU commands from the compromised renderer that reference shared memory or texture buffers allocated for the victim origin’s rendering. Due to the lack of per-command origin validation in the GPU process, these commands return the victim’s pixel data or buffer contents to the attacker, violating the Same-Origin Policy. No public proof-of-concept (PoC) exploit code has been released as of the publication date. However, the vulnerability is considered a zero-day and was unpatched until the release of Chrome 151.0.7922.72.
Protection:
The primary mitigation is to update Google Chrome to version 151.0.7922.72 or later for Windows and macOS, or version 151.0.7922.71 for Linux. Organizations should also deploy network monitoring solutions to detect anomalous GPU activity patterns and implement strict Content Security Policies (CSP) that limit cross-origin resource access. Additional browser hardening measures include disabling unnecessary GPU features for untrusted content and implementing enhanced renderer process isolation to reduce the attack surface. Security teams should consider behavioral analysis of GPU memory operations to identify potential exploitation attempts before data exfiltration can occur.
Impact:
Successful exploitation of CVE-2026-17763 allows an attacker to leak sensitive cross-origin data, including personal communications, financial information, and authentication tokens from other domains. This capability significantly amplifies the damage potential of existing renderer compromises, transforming a limited-access exploit into a powerful cross-origin data extraction mechanism. The vulnerability affects all Chrome versions prior to 151.0.7922.72 across Windows, macOS, and Linux platforms. While the CVSS score is 4.3 (Medium) and the EPSS score is 0.0% (indicating low exploitation activity), the vulnerability remains a serious post-exploitation tool that can lead to severe data breaches if left unpatched.
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Sources:
Reported By: nvd.nist.gov
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