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Microsoft Security Response CenterCVE-2025-30204

jwt-go allows excessive memory allocation during header parsing

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.

Read the vendor bulletin Get alerts for azl3 flannel 0.24.2-14 on Azure Linux
7.5CVSS out of 10High severity
Scope

What the vendor says is affected

  • azl3 flannel 0.24.2-14 on Azure Linux 3.0
  • azl3 etcd 3.5.18-1 on Azure Linux 3.0
  • azl3 coredns 1.11.4-6 on Azure Linux 3.0
  • azl3 telegraf 1.31.0-10 on Azure Linux 3.0
  • azl3 packer 1.9.5-9 on Azure Linux 3.0
  • azl3 kubernetes 1.30.10-7 on Azure Linux 3.0
  • cbl2 azcopy 10.25.1-5 on CBL Mariner 2.0
  • cbl2 etcd 3.5.12-6 on CBL Mariner 2.0
  • cbl2 cert-manager 1.11.2-22 on CBL Mariner 2.0
  • cbl2 telegraf 1.29.4-16 on CBL Mariner 2.0
  • cbl2 packer 1.9.5-13 on CBL Mariner 2.0
  • cbl2 azcopy 10.25.1-5 on CBL-Mariner 2.0
  • cbl2 etcd 3.5.12-6 on CBL-Mariner 2.0
  • cbl2 telegraf 1.29.4-16 on CBL-Mariner 2.0
  • cbl2 packer 1.9.5-12 on CBL Mariner 2.0
  • cbl2 kubernetes 1.28.4-16 on CBL Mariner 2.0
  • cbl2 telegraf 1.29.4-13 on CBL Mariner 2.0
  • cbl2 cert-manager 1.11.2-21 on CBL Mariner 2.0
  • cbl2 prometheus 2.37.9-3 on CBL Mariner 2.0
  • cbl2 etcd 3.5.21-1 on CBL Mariner 2.0
  • cbl2 coredns 1.11.1-16 on CBL Mariner 2.0
  • cbl2 terraform 1.3.2-24 on CBL Mariner 2.0
  • cbl2 moby-engine 24.0.9-16 on CBL Mariner 2.0
  • azl3 kubernetes 1.30.10-4 on Azure Linux 3.0

Versions the vendor lists as fixed

  • 0.24.2-12
  • 3.5.21-1
  • 1.11.4-5
  • 1.31.0-7
  • 1.9.5-7
  • 1.30.10-4
  • 10.25.1-5
  • 1.11.2-21
  • 1.29.4-13
  • 1.9.5-12
  • 1.28.4-16
  • 2.37.9-3
  • 1.11.1-16
  • 1.3.2-24
  • 24.0.9-16
  • 1.7.7-2
  • 2.14.1-5
  • 25.0.3-12
  • 2.3.2-2
  • 10.25.1-3
  • 1.12.15-3
  • 2.45.4-9
Next step

What the vendor recommends

CBL-Mariner Releases

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2025-30204View CVSS, KEV, EPSS, and threat context
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