---
id: CVE-2026-77630
title: >-
  pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA
  callback parsing
summary: >-
  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
  fro…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: pupnp
product: pupnp
affected:
  - pupnp < 22.0.4
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T16:46:58.448632Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:06:16.423Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77630'
references:
  - url: 'https://github.com/pupnp/pupnp/security/advisories/GHSA-46ph-jff5-5h77'
    label: 'https://github.com/pupnp/pupnp/security/advisories/GHSA-46ph-jff5-5h77'
  - url: >-
      https://github.com/pupnp/pupnp/commit/5dba8070b4d64d976f8e6fc13f1f301befebe7d2
    label: >-
      https://github.com/pupnp/pupnp/commit/5dba8070b4d64d976f8e6fc13f1f301befebe7d2
  - url: 'https://github.com/pupnp/pupnp/releases/tag/release-22.0.4'
    label: 'https://github.com/pupnp/pupnp/releases/tag/release-22.0.4'
  - url: 'https://issues.oss-fuzz.com/issues/531780528'
    label: 'https://issues.oss-fuzz.com/issues/531780528'
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.840Z'
---

## Overview

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

- `pupnp < 22.0.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.