CVE-2026-77630 pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing
Remote attackers can cause denial of service in pupnp by supplying slow hostnames that block worker threads during DNS resolution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-77630?
CVE-2026-77630 is a high-severity denial of service vulnerability in pupnp, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-400
Which versions are affected by CVE-2026-77630?
It affects 1 product.
Products include Pupnp Project Pupnp.
How do I fix CVE-2026-77630?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-77630 being exploited?
There is no known exploitation of CVE-2026-77630 in the wild and no public exploit code.
Other vulnerabilities in pupnp
- CVE-2021-29462 DNS rebinding in pupnp
- CVE-2026-57486 pupnp: NULL pointer dereference in ixmlNode_compare crashes on non-namespaced attributes
- CVE-2026-57487 libupnp chunked HTTP bodies can bypass g_maxContentLength and be fully buffered
- CVE-2021-28302 Denial of service in n/a
- CVE-2026-57488 pupnp: Integer truncation in HTTP Content-Length parsing enables request smuggling
Sources
Also known as DEBIAN-CVE-2026-77630, GHSA-46ph-jff5-5h77, UBUNTU-CVE-2026-77630.