What is CVE-2026-106243?

CVE-2026-106243 is a medium-severity vulnerability in Google Chrome, classified under Incomplete Cleanup. CVSS score: 5.3/10. Published 2026-10-06.

How severe is CVE-2026-106243?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Google Chrome

CVE-2026-106243

Incomplete cleanup in Proxy Auth in Google Chrome prior to 155.0.8059.39 allowed an adjacent attacker to obtain sensitive information via crafted network traffic. (Chromium security severity: High)

Published 2026-10-06 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Google Chrome

Weakness classification (CWE)

CWE-459 — Incomplete Cleanup

References

chromereleases.googleblog.com/2026/10/stable-channel-update-for-desktop_0864717… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/533426590 (Permissions Required)

Frequently asked questions

What is CVE-2026-106243?: CVE-2026-106243 is a medium-severity vulnerability in Google Chrome, classified under Incomplete Cleanup. CVSS score: 5.3/10. Published 2026-10-06.
How severe is CVE-2026-106243?: Medium severity. CVSS v3 base score is 5.3 out of 10.