CVE-2026-55862

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-102927 (ENISA EUVD)Source: ENISA EUVD

6.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
45
EG Risk 45/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

October 16, 2026

Last Modified

October 23, 2026

Advisory Details (3)

Auto-updated Oct 16, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

release-2.0.0

Patch available: pupnp/pupnp release-2.0.0

https://github.com/pupnp/pupnp/releases/tag/release-2.0.0
GitHub commit Patch Available

commit 82ccaec7ab6b (pupnp/pupnp)

Patch available: pupnp/pupnp release-2.0.0 (contains commit 82ccaec7ab6b)

https://github.com/pupnp/pupnp/commit/82ccaec7ab6b1258ea1ac66374d8940712ccd4c4
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Incomplete fix for CVE-2021-28302: recursive DOM functions cause stack overflow · Advisory · pupnp/pupnp · GitHub

https://github.com/pupnp/pupnp/security/advisories/GHSA-25cx-xv8x-j247

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 21× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-25 14:18 UTCEG score recompute
  7. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  9. 2026-10-23 16:26 UTCEG score recompute
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  11. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  13. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  14. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  15. 2026-10-18 03:29 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  17. 2026-10-16 20:33 UTCEG score recompute
  18. 2026-10-16 19:25 UTCEG score recompute
  19. 2026-10-16 18:14 UTCEG score recompute
  20. 2026-10-16 15:39 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  21. 2026-10-16 15:38 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55862?
CVE-2026-55862 is a medium-severity vulnerability; its CVE record was published on October 16, 2026. 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…
When was the CVE record for CVE-2026-55862 published?
The CVE record for CVE-2026-55862 was published on October 16, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 23, 2026; the record at its source may have been updated since.
Is CVE-2026-55862 actively exploited?
CVE-2026-55862 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55862?
CVE-2026-55862 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55862?
A fix for CVE-2026-55862 is available: update to the fixed version the vendor names in its advisory.

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