CVE-2026-4224: Stack overflow parsing XML with deeply nested DTD content models

unknownCVE-2026-4224

CSIRTS triage

Denial of service

What: Stack overflow vulnerability when parsing XML with deeply nested DTD content models.
Who is affected: Applications parsing untrusted XML with complex nested DTD structures.
Urgency: Severity unknown; requires assessment of exploitation feasibility and affected XML parsers.
Action: Identify the specific XML parser affected and apply available patches or implement DTD parsing restrictions.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4224

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-42240.64% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-4224	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] CPython: Multiple vulnerabilities allow file manipulation and DoScert-bund
unknownUSN-8509-1: Python vulnerabilitiesubuntu

Recent advisories for Stack overflow parsing

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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