What is CVE-2026-78915?

CVE-2026-78915 is a high-severity vulnerability in Google Chrome, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2026-08-25.

How severe is CVE-2026-78915?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Google Chrome

CVE-2026-78915

Race condition in Enterprise in Google Chrome on on Windows prior to 152.0.7977.65 allowed an adjacent attacker to potentially execute arbitrary code outside the sandbox via crafted network traffic. (Chromium security severity: Low)

Vulnerability class: Race Condition

Published 2026-08-25 · last modified 2026-08-27.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (3.2th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Google Chrome

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/533418127 (Permissions Required)

Frequently asked questions

What is CVE-2026-78915?: CVE-2026-78915 is a high-severity vulnerability in Google Chrome, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.5/10. Published 2026-08-25.
How severe is CVE-2026-78915?: High severity. CVSS v3 base score is 7.5 out of 10.