CVE-2025-58189: ALPN negotiation error contains attacker controlled information in crypto/tls

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2025-Oct

Released

2025-10-31

EPSS Score

0.01% (percentile: 1.7%)

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 (12)

Open Source Software

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

Mariner

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

Revision History

• 2025-10-31: Information published.