SB2026081210 - Multiple vulnerabilities in Microsoft Windows HTTP.sys

Main Vulnerability Database SB2026081210

SB2026081210 - Multiple vulnerabilities in Microsoft Windows HTTP.sys

Published: August 12, 2026

Security Bulletin ID SB2026081210

CSH Severity

Low

Patch available

YES

Number of vulnerabilities 6

Exploitation vector Local access

Highest impact Code execution

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 6 vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2026-61937)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 8.5 [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]

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

The vulnerability exists due to integer overflow in Windows HTTP.sys. A local user can pass specially crafted data to the application, trigger integer overflow and gain elevated privileges on the system.

2) Integer underflow (CVE-ID: CVE-2026-62741)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 8.5 [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]

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

The vulnerability exists due to integer underflow in Windows HTTP.sys. A local user can send a specially crafted request to the affected application, trigger integer underflow andgain elevated privileges on the system.

3) Heap-based buffer overflow (CVE-ID: CVE-2026-62739)

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

CVSSv4: 8.5 [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]

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

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

4) Heap-based buffer overflow (CVE-ID: CVE-2026-62735)

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

CVSSv4: 8.5 [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]

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

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

5) Heap-based buffer overflow (CVE-ID: CVE-2026-62753)

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

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

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

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

6) Heap-based buffer overflow (CVE-ID: CVE-2026-62811)

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

CVSSv4: 8.5 [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]

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

The vulnerability exists due to a boundary error in Windows HTTP.sys. A local user 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