{"id":"CVE-2026-90668","title":"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 w…","summary":"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 w…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"UnrealIRCd","product":"UnrealIRCd","affected":["UnrealIRCd >= 6.0.5 < 6.2.7"],"published":"2026-09-13","updated":"2026-09-22","sourceUpdated":"2026-09-22T20:00:03.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90668","references":[{"url":"https://forums.unrealircd.org/viewtopic.php?t=9483","label":"cve@mitre.org"},{"url":"https://www.unrealircd.org/","label":"cve@mitre.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90668.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-90668"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90668"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00332,"epssPercentile":0.26625,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-14T18:13:05.650571Z"},"ingestedAt":"2026-09-14T15:23:07.477Z","slug":"CVE-2026-90668","body":"## Overview\n\nThe 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).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90668.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}