SB2026051358 - Multiple vulnerabilities in Microsoft .NET

Description

This security bulletin contains information about 2 vulnerabilities.

1) Input validation error (CVE-ID: CVE-2026-35433)

CWE-ID: CWE-20 - Improper input validation

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

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

The vulnerability exists due to insufficient validation of user-supplied input in .NET. A local attacker can gain elevated privileges on the system.

2) Heap-based buffer overflow (CVE-ID: CVE-2026-32177)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

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

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

The vulnerability exists due to a boundary error in .NET. A local attacker can pass specially crafted data to the application, trigger a heap-based buffer overflow and gain elevated privileges on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35433
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32177