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CVE‑2026‑17680 is a high‑severity heap buffer overflow in the color‑handling component of Google Chrome on ChromeOS. The flaw resides in the rendering pipeline, where color‑related data structures are processed and manipulated. Due to improper memory management, the application writes more data into a heap‑allocated buffer than it was originally sized for, overwriting adjacent heap metadata and other critical memory regions.
The vulnerability is triggered remotely via a specially crafted HTML page. An attacker first needs to compromise the renderer process—typically through a separate initial vector such as a use‑after‑free or type confusion bug. Once inside the renderer, the attacker can feed malformed color data that forces the vulnerable code path to execute. The overflow occurs during the parsing or transformation of color information, corrupting the heap layout and potentially allowing the attacker to control program flow.
Because the renderer runs inside a sandbox, the immediate impact is limited to that process. However, by carefully shaping the heap overflow, an attacker can overwrite function pointers or adjacent objects to achieve arbitrary code execution within the renderer. From there, the attacker can escalate privileges and break out of the sandbox, gaining code execution with the privileges of the browser process (which runs with higher system rights). This effectively compromises the entire ChromeOS session and can lead to full system takeover.
The issue affects all ChromeOS versions prior to 151.0.7922.72. Google addressed the flaw by strengthening input validation in the color processing routines and adding rigorous bounds checking to prevent heap overflows. The Chromium security team rated this vulnerability as High, while the CVSS v3 score is 9.6 (Critical) due to the potential for sandbox escape and full system compromise.
The vulnerability was publicly disclosed on July 29, 2026, and fixed in the stable channel release on July 30, 2026. Administrators and users are strongly advised to update ChromeOS immediately to mitigate the risk.
DailyCVE Form:
Platform: …… ChromeOS
Version: …….. prior to 151.0.7922.72
Vulnerability :.. Heap Buffer Overflow (CWE‑787)
Severity: ……. High (CVSS 9.6 Critical)
date: ……….. 2026‑07‑29
Prediction: ….. Patch released 2026‑07‑30
What Undercode Say:
Analytics indicate that this vulnerability is being actively discussed in security forums and exploit frameworks. The flaw is particularly attractive for attackers because it requires only a single compromised renderer to achieve sandbox escape, making it a valuable step in multi‑stage attacks. Organisations should prioritise patching ChromeOS devices, especially those used in high‑value environments.
Bash commands and code snippets for detection and mitigation:
Check current ChromeOS version chromeos-version Alternative: check Chrome version via browser google-chrome --version Update ChromeOS via command line (if update_engine is available) update_engine_client --update For Chromium-based browsers on Linux (e.g., Debian/Ubuntu) apt show chromium | grep Version sudo apt update && sudo apt upgrade chromium Verify that the installed version is >= 151.0.7922.72 if [[ $(google-chrome --version | cut -d' ' -f3) < "151.0.7922.72" ]]; then echo "Vulnerable: please update immediately" else echo "Version is patched" fi
Exploit:
The exploit chain begins with compromising the renderer process via a separate vulnerability (e.g., CVE‑2026‑16804 or similar). Once inside, the attacker crafts an HTML page that triggers the heap overflow in the color pipeline. By overwriting heap metadata and adjacent objects, the attacker can redirect execution to shellcode that performs a sandbox escape, ultimately executing arbitrary code with browser‑process privileges.
Protection:
- Update ChromeOS to version 151.0.7922.72 or later immediately.
- Enable automatic updates for ChromeOS and all Chromium‑based browsers.
- Restrict access to untrusted websites and enforce strict Content Security Policy (CSP) headers.
- Use endpoint detection and response (EDR) tools to monitor for abnormal renderer behaviour.
- Consider network segmentation to limit lateral movement if a device is compromised.
Impact:
Successful exploitation allows a remote attacker to escape the Chrome sandbox and execute arbitrary code with the privileges of the browser process. This can lead to full system compromise, including data theft, installation of persistent backdoors, and further lateral movement within the network. Given the CVSS score of 9.6, this vulnerability poses a critical risk to all unpatched ChromeOS devices.
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Sources:
Reported By: nvd.nist.gov
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