EIP-2026-117495

PRE-CVE

Microsoft HTML Help Compiler 4.74.8702.0 - Local Overflow (SEH)

Title source: legacy

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-117495. PoCs published by St0rn.

AI-analyzed exploit summary This exploit leverages an SEH-based buffer overflow in Microsoft HTML Help Compiler (hhc.exe) to execute arbitrary shellcode, specifically launching calc.exe. The payload is crafted with a jump to bypass SEH and a null-free shellcode to avoid bad characters.

Description

Microsoft HTML Help Compiler 4.74.8702.0 - Local Overflow (SEH)

Exploits (1)

exploitdb WORKING POC

by St0rn · pythonlocalwindows

https://www.exploit-db.com/exploits/37771

View Code ZIP pw:eip

This exploit leverages an SEH-based buffer overflow in Microsoft HTML Help Compiler (hhc.exe) to execute arbitrary shellcode, specifically launching calc.exe. The payload is crafted with a jump to bypass SEH and a null-free shellcode to avoid bad characters.

Classification

Working Poc 95%

Attack Type

Rce

Complexity

Moderate

Reliability

Reliable

Target: Microsoft HTML Help Workshop 4.74.8702.0

No auth needed

Prerequisites: hhc.exe installed on target system · ability to execute the script on the target

MITRE ATT&CK

T1203 - Exploitation for Client Execution T1059 - Command and Scripting Interpreter

devstral-2 · analyzed Feb 19, 2026 Full analysis →

Details

Status pre_cve

Tracked Since Feb 18, 2026