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CVE-2026-90668

UnrealIRCd · denial of service

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-90668

Published

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).

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-90668

Published

UnrealIRCd

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "modules": [
                        "webserver"
                    ],
                    "product": "UnrealIRCd",
                    "programFiles": [
                        "src/modules/webserver.c"
                    ],
                    "programRoutines": [
                        {
                            "name": "webserver_handle_request_header()"
                        }
                    ],
                    "repo": "https://github.com/unrealircd/unrealircd",
                    "vendor": "UnrealIRCd",
                    "versions": [
                        {
                            "lessThan": "6.2.7",
                            "status": "affected",
                            "version": "6.0.5",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON