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

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Mar

Released

2026-03-19

Last Updated

2026-10-28

EPSS Score

0.70% (percentile: 53.2%)

Affected Products (8)

Open Source Software

• azl3 python3 3.12.9-9 on Azure Linux 3.0
• cbl2 python3 3.9.19-19 on CBL Mariner 2.0
• azl3 python3 3.12.9-10 on Azure Linux 3.0
• azl3 python3 3.12.9-13 on Azure Linux 3.0
• azl3 python3 3.12.9-11 on Azure Linux 3.0
• cbl2 python3 3.9.19-19
• azl3 python3 3.12.9-14 on Azure Linux 3.0
• cbl2 python3 3.9.19-19 on CBL-Mariner 2.0

Revision History

• 2026-03-19: Information published.
• 2026-03-19: Information published.
• 2026-03-31: Information published.
• 2026-04-13: Information published.
• 2026-06-03: Information published.
• 2026-06-28: Information published.
• 2026-08-07: Information published.
• 2026-08-10: Information published.
• 2026-08-23: Information published.
• 2026-09-25: Information published.
• 2026-10-21: Information published.
• 2026-10-28: Information published.