What is CVE-2026-78957?

CVE-2026-78957 is a medium-severity vulnerability in Google Chrome, classified under Information Disclosure. CVSS score: 5.5/10. Published 2026-08-25.

How severe is CVE-2026-78957?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Information disclosure in Google Chrome

CVE-2026-78957

Information leak in Mobile in Google Chrome on on iOS prior to 152.0.7977.65 allowed a local attacker to obtain sensitive information via a crafted file. (Chromium security severity: Low)

Vulnerability class: Information Disclosure

Published 2026-08-25 · last modified 2026-09-02.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (1.8th percentile), scored 2026-10-10.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.8% 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-200 — Information Disclosure

References

chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/533123348 (Permissions Required)

Frequently asked questions

What is CVE-2026-78957?: CVE-2026-78957 is a medium-severity vulnerability in Google Chrome, classified under Information Disclosure. CVSS score: 5.5/10. Published 2026-08-25.
How severe is CVE-2026-78957?: Medium severity. CVSS v3 base score is 5.5 out of 10.