Is CVE-2026-8521 actively exploited?

No active exploitation of CVE-2026-8521 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8521 be exploited remotely?

Partially. CVE-2026-8521 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-8521?

CVE-2026-8521 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-8521

CWE-416Published: May 14, 2026· Updated: May 18, 2026

7.5

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:10.3th

Official Description

Use after free in Tab Groups in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code via malicious network traffic. (Chromium security severity: Critical)

NVD Source

Technical Analysis

CVE-2026-8521 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.