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Findings

CVE-2026-4224

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

Published Mar 16, 2026 · updated Aug 13, 2026 · python python

When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 16, 2026 · NIST NVD

    Detected

    When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

  2. Aug 13, 2026 · NIST NVD

    Updated

    When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

Affected

  • cpe python/pythonversion unspecified
  • cpe python/python3.15.0

Sources

  • CVE.orgVulnerability recordCVE-2026-4224

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-4224

    When an Expat parser with a registered ElementDeclHandler parses an inline document type definition containing a deeply nested content model a C stack overflow occurs.

    nvd.nist.gov

References