EIP-2026-103577

PRE-CVE

Mozilla Products - 'Host:' Buffer Overflow (Denial of Service) (PoC) String

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103577. PoCs published by Tom Ferris.

AI-analyzed exploit summary This exploit demonstrates a buffer overflow DoS vulnerability in Mozilla Firefox <= 1.0.6 by using a malformed hostname string with excessive dashes. The issue arises in the NormalizeIDN call within nsStandardURL::BuildNormalizedSpec, leading to a crash.

Description

Mozilla Products - 'Host:' Buffer Overflow (Denial of Service) (PoC) String

Exploits (1)

exploitdb WORKING POC VERIFIED
by Tom Ferris · htmldosmultiple
https://www.exploit-db.com/exploits/1204

This exploit demonstrates a buffer overflow DoS vulnerability in Mozilla Firefox <= 1.0.6 by using a malformed hostname string with excessive dashes. The issue arises in the NormalizeIDN call within nsStandardURL::BuildNormalizedSpec, leading to a crash.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Mozilla Firefox <= 1.0.6
No auth needed
Prerequisites: Victim must open the malicious HTML file in a vulnerable version of Firefox
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026