What is CVE-2026-9123?

CVE-2026-9123 is a high-severity vulnerability in Google Android, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-05-20.

How severe is CVE-2026-9123?

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

Buffer overflow in Google Android

CVE-2026-9123

Heap buffer overflow in Chromecast in Google Chrome on Android, Linux, ChromeOS prior to 148.0.7778.179 allowed a local attacker to execute arbitrary code inside a sandbox via malicious network traffic. (Chromium security severity: Medium)

Vulnerability class: Buffer Overflow

Published 2026-05-20 · last modified 2026-07-23.

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: 0.002 (6.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000

Affected products

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0841193… (Vendor Advisory)
issues.chromium.org/issues/495988507 (Permissions Required)

Frequently asked questions

What is CVE-2026-9123?: CVE-2026-9123 is a high-severity vulnerability in Google Android, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-05-20.
How severe is CVE-2026-9123?: High severity. CVSS v3 base score is 7.5 out of 10.