Bug 2532640 (CVE-2026-90668)

Summary: CVE-2026-90668 UnrealIRCd: UnrealIRCd: Denial of Service via unlimited HTTP request headers
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in UnrealIRCd. The webserver component does not properly limit the number of HTTP request headers. A remote attacker can exploit this vulnerability by sending an HTTP request with an excessive number of headers, leading to memory consumption and an unresponsive server. This can result in a Denial of Service (DoS), making the server unavailable to legitimate users, particularly if a websocket or JSON-RPC listener is enabled.
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Bug Depends On: 2532934, 2532935    
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Description OSIDB Bzimport 2026-09-13 02:21:20 UTC 
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).