Vulnerability · Published Oct 16, 2026 · Assigned by GitHub_M

CVE-2026-55862pupnp: Incomplete fix for CVE-2021-28302: recursive DOM functions cause stack overflow

Medium 6.5

In plain English

A medium-severity security flaw in pupnp from pupnp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.5%top 59.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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. 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	pupnp	no fix listed	DEBIAN-CVE-2026-55862
Debian:14	pupnp	1:22.1.8-2	DEBIAN-CVE-2026-55862
Ubuntu:24.04:LTS	pupnp	no fix listed	UBUNTU-CVE-2026-55862
Ubuntu:26.04:LTS	pupnp	no fix listed	UBUNTU-CVE-2026-55862
Ubuntu:26.10	pupnp	no fix listed	UBUNTU-CVE-2026-55862
Ubuntu:22.04:LTS	pupnp-1.8	no fix listed	UBUNTU-CVE-2026-55862

Affected products (as reported)

Vendor	Product	Versions
pupnp	pupnp	< 2.0.0

Weakness: CWE-674 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/pupnp/pupnp/security/advisories/GHSA-25cx-xv8x-j247 x_refsource_CONFIRM
https://github.com/pupnp/pupnp/commit/82ccaec7ab6b1258ea1ac66374d8940712ccd4c4 x_refsource_MISC
https://github.com/pupnp/pupnp/releases/tag/release-2.0.0 x_refsource_MISC