What’s Vulnerable › Vulnerabilities

CVE-2026-77630: pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-20
• Weakness: CWE-400

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.

Affected products

• pupnp: before 22.0.4 — fixed in 22.0.4

How to fix

Upgrade to a fixed version: pupnp 22.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/pupnp/pupnp/commit/5dba8070b4d64d976f8e6fc13f1f301befebe7d2
• https://github.com/pupnp/pupnp/releases/tag/release-22.0.4
• https://github.com/pupnp/pupnp/security/advisories/GHSA-46ph-jff5-5h77
• https://issues.oss-fuzz.com/issues/531780528

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