CVE-2026-55862

Status: Undergoing AnalysisMedium (6.5)—

Severity6.5Medium · CVSS 3.1

Exploitation probability0.38 %higher than 30% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

pupnp is an SDK for development of UPnP device and control point applications. Prior to 2.0.0, multiple ixml DOM traversal functions process deeply nested XML with unbounded recursion. The iterative XML parser accepts the document, but ixmlPrintDomTreeRecursive in ixml/src/ixml.c and ixmlNode_getElementsByTagNameRecursive, ixmlNode_getElementsByTagNameNSRecursive, ixmlNode_cloneNodeTreeRecursive, and ixmlNode_isAncestor in ixml/src/node.c recurse over firstChild and nextSibling links.

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An unauthenticated peer on the local network can supply deeply nested XML through a SOAP request, exhaust a service thread's stack, and crash the UPnP service. This is an incomplete-fix case for CVE-2021-28302 because its remediation converted ixmlNode_free but left these traversal paths recursive. This issue is fixed in 2.0.0.

CVSS

Base score: 6.5
Version: 3.1
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.38 %
Percentile among all scored CVEs: 30
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1210 Exploitation of Remote Serviceslateral movement90 %
Primary impactT1499 Endpoint Denial of Serviceimpact88 %

Vector AV:A/PR:N/UI:N (red adyacente, sin privilegios); XML anidado por SOAP agota la pila por recursión sin límite (CWE-674) y tumba el servicio.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Network Segmentation Filter Network Traffic Disable or Remove Feature or Program

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Pupnp Project — Pupnp^AI

CWEs

CWE-674

References

Show 4 references

Raw JSON (NVD)

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{
  "id": "CVE-2026-55862",
  "cveTags": [],
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              "automatable": "no"
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          "version": "2.0.3",
          "timestamp": "2026-10-16T19:07:16.486742Z"
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          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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        "exploitabilityScore": 2.8
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      "source": "security-advisories@github.com",
      "affectedData": [
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  "published": "2026-10-16T16:18:44.060",
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      "url": "https://github.com/pupnp/pupnp/commit/82ccaec7ab6b1258ea1ac66374d8940712ccd4c4",
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      "lang": "en",
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    }
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  "lastModified": "2026-10-16T20:17:23.363",
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