CVE-2026-55862Public exploitHinoki check available

Service crash via unbounded DOM traversal

Published Oct 16, 2026 · Updated Oct 16, 2026

PUPnP libupnp before 2.0.0 allows remote attackers to crash UPnP services via stack exhaustion from deeply nested SOAP XML. After parsing succeeds, ixmlPrintDomTreeRecursive in ixml/src/ixml.c and traversal functions in ixml/src/node.c follow child and sibling links recursively without depth limits. Exploitation requires unauthenticated access from the local network to a consuming UPnP service; the documented consequence is a service crash, not data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

PUPnP libupnp before 2.0.0 allows remote attackers to crash UPnP services via stack exhaustion from deeply nested SOAP XML. After parsing succeeds, ixmlPrintDomTreeRecursive in ixml/src/ixml.c and traversal functions in ixml/src/node.c follow child and sibling links recursively without depth limits. Exploitation requires unauthenticated access from the local network to a consuming UPnP service; the documented consequence is a service crash, not data disclosure or modification.

The record

CVE
CVE-2026-55862
Published
Oct 16, 2026
Updated
Oct 16, 2026
Vendor
PUPnP
Product
libupnp
Classifications
CWE-674, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.0.0

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

PUPnP · libupnpversion=< 2.0.0

Published CVSS scores

6.5GitHub_MCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

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Technologies

Your stack

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