What is CVE-2026-108457?

CVE-2026-108457 is a high-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Out-of-bounds Write. CVSS score: 8.1/10. Published 2026-10-13.

How severe is CVE-2026-108457?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Microsoft Windows 10 Version 21h2

CVE-2026-108457

Out-of-bounds write in Microsoft Windows PDF allows an unauthorized attacker to execute code over a network.

Vulnerability class: Buffer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

Microsoft Windows PDF Remote Code Execution Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-108457?: CVE-2026-108457 is a high-severity vulnerability in Microsoft Windows 10 Version 21h2, classified under Out-of-bounds Write. CVSS score: 8.1/10. Published 2026-10-13.
How severe is CVE-2026-108457?: High severity. CVSS v3 base score is 8.1 out of 10.