CVE-2025-58187: Quadratic complexity when checking name constraints in crypto/x509

Overview

Severity

Medium (CVSS 5.3)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2025-Oct

Released

2025-10-31

Last Updated

2026-02-18

EPSS Score

0.02% (percentile: 4.7%)

FAQ

Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability? One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.

Affected Products (14)

Mariner

• cbl2 gcc 11.2.0-8 on CBL Mariner 2.0
• azl3 tensorflow 2.16.1-9 on Azure Linux 3.0
• azl3 gcc 13.2.0-7 on Azure Linux 3.0

Open Source Software

• cbl2 python-tensorboard 2.11.0-3 on CBL Mariner 2.0
• cbl2 msft-golang 1.24.9-1 on CBL Mariner 2.0
• cbl2 golang 1.18.8-10 on CBL Mariner 2.0
• cbl2 golang 1.22.7-5 on CBL Mariner 2.0
• cbl2 msft-golang 1.24.8-1 on CBL Mariner 2.0
• azl3 golang 1.23.12-1 on Azure Linux 3.0
• azl3 golang 1.25.3-1 on Azure Linux 3.0
• cbl2 tensorflow 2.11.1-2 on CBL Mariner 2.0
• azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0

Other

• 20707-17084
• 20863-17084

Revision History

• 2025-10-31: Information published.
• 2025-12-07: Information published.
• 2025-12-12: Information published.
• 2025-12-13: Information published.
• 2026-02-18: Information published.