What is CVE-2026-108457?

CVE-2026-108457 is a security advisory published by Microsoft with Critical severity. EchelonGraph links Microsoft's advisory rather than copying its page; it is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108457.

Which CVE IDs does CVE-2026-108457 cover?

CVE-2026-108457 covers the following CVE IDs: CVE-2026-108457. Each CVE has its own detail page on EchelonGraph Pulse with its EchelonGraph score.

What is the CVSS v3 score of CVE-2026-108457?

CVE-2026-108457 has a CVSS v3 base score of 8.1, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-108457?

CVE-2026-108457 affects 12 products, including: Windows 10 Version 21H2 for 32-bit Systems; Windows 10 Version 21H2 for ARM64-based Systems; Windows 10 Version 21H2 for x64-based Systems; Windows 10 Version 22H2 for 32-bit Systems; Windows 10 Version 22H2 for ARM64-based Systems; and others — see the full list on the advisory page.

How do I remediate CVE-2026-108457?

Microsoft lists 4 KB articles for CVE-2026-108457: KB5126653, KB5126657, KB5126655, KB5126646. Each is listed on this page with its fixed build; Microsoft's advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108457.

CVE-2026-108457CriticalMicrosoft CVSS 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Microsoft security update for CVE-2026-108457 — Windows

Vendor

Microsoft Security Response Center (MSRC)

Published

October 13, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-108457 →

📋 Microsoft's advisory

EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108457. This page also shows what EchelonGraph holds for CVE-2026-108457, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.

🎯 Affected products12

Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2025
Windows Server 2025 (Server Core installation)

✅ Updates Microsoft lists: 4 KB articles

5 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.

KB article	Update	Fixed build
KB5126653	Security Update	10.0.22631.7652
KB5126657	Security Update	10.0.19044.7807
KB5126657	Security Update	10.0.19045.7807
KB5126655	Security Update	10.0.20348.5761
KB5126646	Security Update	10.0.26100.33650

🧭 EchelonGraph on CVE-2026-108457

EchelonGraph score: 8.1 HIGH
CISA KEV: Not listed
Fix status: A fix is available — apply it.

Description from the CVE record (CVE.org), as published by its numbering authority

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

Published by Microsoft Corporation, the CVE Numbering Authority that assigned CVE-2026-108457, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).

🔗 CVE IDs covered (1)

📋 Microsoft's advisory

🎯 Affected products12

✅ Updates Microsoft lists: 4 KB articles

🧭 EchelonGraph on CVE-2026-108457

🔗 References (9)