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  4. CVE 2026 77630 pupnp denial of service via blocking dns
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Back to active CVEs
High · CVSS 7.5CVE-2026-77630

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

Answer in brief

CVE-2026-77630 records a High severity (CVSS 7.5) vulnerability in pupnp: Denial of service via blocking DNS resolution in parse_uri()/GENA callback parsing. The current sources do not mark it as known exploited. The current feed maps pupnp/pupnp (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 16, 2026Updated Oct 16, 2026Source checked Oct 16, 2026First seen by HOL Oct 16, 2026Material review Oct 16, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps pupnp/pupnp (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
pupnp/pupnpgeneric<22.0.422.0.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for pupnp/pupnp.
  2. 2Review the reported fix. Update pupnp/pupnp to 22.0.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceissues.oss-fuzz.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • pupnp: Incomplete fix for CVE-2021-28302: recursive DOM functions cause stack overflowSame pupnp/pupnp package
  • pupnp: NULL pointer dereference in ixmlNode_compare crashes on non-namespaced attributesSame pupnp/pupnp package
  • libupnp chunked HTTP bodies can bypass g_maxContentLength and be fully bufferedSame pupnp/pupnp package
  • pupnp: Integer truncation in HTTP Content-Length parsing enables request smugglingSame pupnp/pupnp package
  • dcg: Exponential-time command-substitution preprocessing lets a crafted command hang dcg and bypass the guard via hook-timeout fail-openAlso CWE-400
  • Improper verification of the source of a communication channel in FreeRTOS-Plus-TCP Router Advertisement handlingSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-400
Source
CVE List V5
Source checked
Oct 16, 2026
References
4 linked sources
Open source record