Bug 2554170 (CVE-2026-77630)

Summary: CVE-2026-77630 libupnp: libupnp: Denial of Service via synchronous hostname resolution
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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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 libupnp. This vulnerability allows a remote, unauthenticated attacker to cause a Denial of Service (DoS) by submitting requests containing slow or non-responsive hostnames. Because the library performs synchronous network address lookups on attacker-supplied hostnames, worker threads become blocked waiting for DNS (Domain Name System) resolver timeouts, exhausting the server thread pool and preventing legitimate requests from being handled.
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Bug Depends On: 2558162, 2558163    
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Description OSIDB Bzimport 2026-10-16 15:52:02 UTC 
pupnp is an SDK for development of UPnP device and control point applications. Prior to 22.0.4, parse_hostport in upnp/src/genlib/net/uri/uri.c synchronously calls getaddrinfo while parse_uri is processing attacker-supplied hostnames from inbound HTTP request targets in upnp/src/genlib/net/http/httpparser.c and GENA SUBSCRIBE CALLBACK headers handled by create_url_list in upnp/src/gena/gena_device.c. A remote unauthenticated peer can choose a slow or nonresponsive hostname and block a bounded miniserver worker for the resolver timeout, allowing a small number of requests to exhaust the thread pool and deny UPnP service. This issue is fixed in 22.0.4.