CVE-2026-42896
published 2026-05-12CVE-2026-42896: Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
PriorityP344high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.28%
20.4th percentile
Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_11_24h2 | < 10.0.26100.8457 | 10.0.26100.8457 |
| microsoft | windows_11_25h2 | < 10.0.26200.8457 | 10.0.26200.8457 |
| microsoft | windows_11_26h1 | < 10.0.28000.2113 | 10.0.28000.2113 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.8457 | 10.0.26100.8457 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.8457 | 10.0.26200.8457 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.2113 | 10.0.28000.2113 |
| microsoft | windows_server_2025 | < 10.0.26100.32860 | 10.0.26100.32860 |
| microsoft | windows_server_2025 | >= 10.0.26100.0 < 10.0.26100.32860 | 10.0.26100.32860 |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
VulDB
Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2025 DWM Core Library integer overflow
vuldb·2026-05-12
CVE-2026-42896 [CRITICAL] Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2025 DWM Core Library integer overflow
A vulnerability, which was classified as critical, was found in Microsoft Windows 11 24H2/11 25H2/11 26H1/Server 2025. Affected by this issue is some unknown functionality of the component DWM Core Library. Executing a manipulation can lead to integer overflow.
This vulnerability is tracked as CVE-2026-42896. The attack is restricted to local execution. No exploit exists.
You should upgrade the affected component.
GHSA
GHSA-xq6v-x2f5-r47x: Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally
ghsa_unreviewed·2026-05-12
CVE-2026-42896 [HIGH] CWE-122 GHSA-xq6v-x2f5-r47x: Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally
Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
No detection rules found.
No public exploits indexed.
Rapid7
Patch Tuesday - May 2026
blogs_rapid7·2026-05-13·CVSS 10.0
CVE-2026-41089 [CRITICAL] Patch Tuesday - May 2026
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild or public disclosure for any of these vulnerabilities. So far this month, Microsoft has provided patches to address 133 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Windows Netlogon: critical RCE
Anyone responsible for securing a domain controller should prioritize remediation of CVE-2026-41089 , which is a critical stack-based buffer overflow in Windows Netlogon with a CVSS v3 base score of 9.8. Exploitation leads to execution in the context of the Netlogon service, so that’s SYSTEM privileges on the domain controller. For most pentesters, that’s the point at which the customer report more or less writes itself. No privileges
Sans Isc
Microsoft May 2026 Patch Tuesday, (Tue, May 12th)
blogs_sans_isc·2026-05-12·CVSS 4.3
CVE-2026-41103 [MEDIUM] Microsoft May 2026 Patch Tuesday, (Tue, May 12th)
Microsoft May 2026 Patch Tuesday
Published: 2026-05-12. Last Updated: 2026-05-12 18:29:36 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
Today's Microsoft patch Tuesday fixes 137 different vulnerabilities. In addition, the update addresses 137 Chromium-related issues affecting Microsoft Edge.
There are no already disclosed or already exploited vulnerabilities included in today's patches. I removed the Chromium issues from the table below and included only the 137 Microsoft issues to make it more readable.
Note that issues related to Microsoft Azure are labeled as "no customer action required.
Significant Vulnerabilities of interest:
CVE-2026-41103: This vulnerability affects the Microsoft SSO Plugin for Jira & Confluence. Exploitation could lead to an elevation of privileges. Wit
2026-05-12
Published