CVE-2026-90668
Quick assessment
Affected
UnrealIRCd UnrealIRCd
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
UnrealIRCd 6.0.5 至 6.2.6（6.2.7 之前）版本的 Web 服务器未限制 HTTP 请求头的数量，这使得远程攻击者可以通过发送带有无限数量请求头的 HTTP 请求，导致服务拒绝（内存耗尽、服务器无响应），前提是已启用 WebSocket 或 JSON-RPC 监听器（该功能默认处于禁用状态）。
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I. Basic Information for CVE-2026-90668
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| UnrealIRCd | UnrealIRCd | 6.0.5 ~ 6.2.7 | - |
|
II. Public POCs for CVE-2026-90668
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-90668 (2)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-90668
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