# CVE-2026-90668

## Summary

- **CVE ID:** CVE-2026-90668
- **Severity:** HIGH
- **CVSS Score:** 8.7 (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/AU:Y/R:A/RE:L)
- **CWE:** CWE-770
- **Published:** Sep 13, 2026
- **Last Modified:** Sep 14, 2026

## Description

The webserver in UnrealIRCd 6.0.5 through 6.2.6 before 6.2.7 does not limit the number of HTTP request headers, which allows remote attackers to cause a denial of service (memory consumption and unresponsive server) via an HTTP request with an unlimited number of headers, if a websocket or JSON-RPC listener is enabled (disabled by default).

## Affected Products

- UnrealIRCd — UnrealIRCd (6.0.5)

## References

- [CNA](https://www.unrealircd.org/)
- [CNA](https://forums.unrealircd.org/viewtopic.php?t=9483)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 26.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._