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TI-2026-75358 Aliases CVE-2026-77630

Blocking DNS lookups in pupnp allow denial of service

Priority LOW 39CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

pupnp before 22.0.4 synchronously calls getaddrinfo while parsing attacker-supplied hostnames in HTTP request targets and GENA SUBSCRIBE CALLBACK headers (CWE-400). A remote unauthenticated peer can pick a slow or nonresponsive hostname to block a miniserver worker for the resolver timeout, so a few requests can exhaust the thread pool and deny UPnP service.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0034 27th percentileScored 2026-11-07
Fix Fixed pupnp (pupnp): 22.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
pupnppupnpbefore 22.0.422.0.4Patch availableCNA
  • pupnp Vendorpupnp Affected before 22.0.4 Fixed in 22.0.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:pupnp_project:pupnp:*:*:*:*:*:*:*:*before 22.0.4Vulnerablepupnp
  • cpe:2.3:a:pupnp_project:pupnp:*:*:*:*:*:*:*:* Versions before 22.0.4 Vulnerable ·pupnp

Remediation

Upgrade pupnp to version 22.0.4, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA pupnp (pupnp) Fixed in 22.0.4

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-77630
  2. 2026-10-16 CISA SSVC decision points changed
  3. 2026-10-16 Priority changed: MEDIUM → LOW
  4. 2026-10-21 Affected versions changed · Red Hat
  5. 2026-10-21 CVSS score added · Red Hat

References

Patch 1

Advisory 1

Other 2

  • TI-2026-75352 pupnp: NULL pointer dereference in ixmlNode_compare, non-namespaced attributes CVSS 3.1HIGH 7.5
  • TI-2026-75354 pupnp Content-Length integer truncation enables request smuggling CVSS 3.1HIGH 7.1
  • TI-2026-75349 Uncontrolled recursion in pupnp DOM functions causes stack overflow CVSS 3.1MEDIUM 6.5
  • TI-2021-10175 DNS rebinding in pupnp CVSS 3.1CRITICAL 9.8
  • TI-2026-75353 Chunked HTTP bodies in libupnp bypass the size limit CVSS 3.1HIGH 7.5
  • TI-2021-09467 A stack overflow in pupnp before version 1.14.5 can cause the denial of service through… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences