CVE-2026-78991 Race condition in Chrome

What is CVE-2026-78991?

CVE-2026-78991 is a medium-severity vulnerability in Google Chrome, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Race condition in WebProtect in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)

Weakness: CWE-367

Which versions are affected by CVE-2026-78991?

It affects 1 product.

Products include Google Chrome.

How do I fix CVE-2026-78991?

Upgrade to a fixed version.

Is CVE-2026-78991 being exploited?

There is no known exploitation of CVE-2026-78991 in the wild and no public exploit code.

Other vulnerabilities in Google Chrome

• CVE-2022-4135 Google Chromium GPU Heap Buffer Overflow Exploited Critical 9.6
• CVE-2020-16017 Google Chrome Use-After-Free Exploited Critical 9.6
• CVE-2020-16010 Google Chrome for Android UI Heap Buffer Overflow Exploited Critical 9.6
• CVE-2026-87491 Google Chromium V8 Out of Bounds Write Exploited High 8.8
• CVE-2026-85046 Google Chromium V8 Type Confusion Exploited High 8.8

All Google Chrome vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-78991, ECHO-b541-ce59-fcd7, GHSA-mx4f-pjm3-x629, MINI-462v-9mwr-jww9.