SB20260310127 - Multiple vulnerabilities in Microsoft .NET

Description

This security bulletin contains information about 2 vulnerabilities.

1) Incorrect default permissions (CVE-ID: CVE-2026-26131)

CWE-ID: CWE-276 - Incorrect Default Permissions

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to incorrect default permissions in .NET. A local user can gain elevated privileges on the target systen.

2) Out-of-bounds read (CVE-ID: CVE-2026-26127)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in .NET. A remote attacker can trigger an out-of-bounds read error and cause a denial of service condition on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26131
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26127