CVE-2026-42504: Quadratic complexity in WordDecoder.DecodeHeader in mime

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-Jun

Released

2026-06-05

Last Updated

2026-07-02

EPSS Score

0.56% (percentile: 42.9%)

Affected Products (7)

Open Source Software

• azl3 tensorflow 2.16.1-11 on Azure Linux 3.0
• azl3 golang 1.25.11-3 on Azure Linux 3.0
• azl3 golang 1.25.10-1 on Azure Linux 3.0
• azl3 golang 1.26.3-1 on Azure Linux 3.0
• azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0
• azl3 golang 1.26.4-3 on Azure Linux 3.0

Mariner

• azl3 gcc 13.2.0-7 on Azure Linux 3.0

Revision History

• 2026-06-05: Information published.
• 2026-06-07: Information published.
• 2026-06-07: Information published.
• 2026-06-09: Information published.
• 2026-06-28: Information published.
• 2026-07-02: Information published.