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Microsoft Security Response CenterCVE-2026-40356

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to terminate in parse_message.

Mariner

Read the vendor bulletin Get alerts for azl3 krb5 1.21.3-3 on Azure Linux
5.9CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • azl3 krb5 1.21.3-3 on Azure Linux 3.0
  • cbl2 krb5 1.19.4-5 on CBL Mariner 2.0
  • azl3 krb5 1.21.3-4 on Azure Linux 3.0
  • cbl2 krb5 1.19.4-5 on CBL-Mariner 2.0

Versions the vendor lists as fixed

  • 1.21.3-4
Next step

What the vendor recommends

CBL-Mariner Releases Release Notes

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-2026-40356View CVSS, KEV, EPSS, and threat context
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