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High · 7.5 CVE-2026-90668 EUVD-2026-76937GHSA-fj9c-wr2v-556h

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 attacke…

Published Sep 13, 2026 · Updated Sep 14, 2026 · Assigned by mitre

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

VendorProductAffectedFixed
UnrealIRCd UnrealIRCd 6.0.5 – < 6.2.7 6.2.7

References