CVE-2026-90668 UnrealIRCd - Denial of Service

UnrealIRCd 6.0.5 through 6.2.6 before 6.2.7 contains a denial of service caused by unlimited HTTP request headers in the webserver when websocket or JSON-RPC listener is enabled, letting remote attackers cause memory exhaustion and server unresponsiveness, exploit requires enabled websocket or JSON-RPC listener.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.58% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
13 September 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to version 6.2.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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