Vulnerability · Published Sep 13, 2026 · Assigned by mitre
CVE-2026-90668
High 7.5
In plain English
A high-severity resource allocation without limits in UnrealIRCd from UnrealIRCd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities).
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.6%top 52.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| UnrealIRCd | UnrealIRCd | 6.0.5 – before 6.2.7 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H