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CVE-2026-40355

CVE-2026-40355

This page contains facts from public vulnerability sources. Check the original advisory before updating.

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference 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, causing the process to terminate in parse_nego_message.

CVSS 5.9 · Medium · EPSS 0.8% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • kerberos 5

    Versions
    • ≥ 1.18, < 1.22.3: Affected (custom)

    Update to 1.22.3

  • krb5 Debian:12

    Versions
    • 1.20.1-2
    • 1.20.1-2+deb12u1
    • 1.20.1-2+deb12u2
    • 1.20.1-2+deb12u3
    • 1.20.1-2+deb12u4
    Affected ranges
    • ECOSYSTEM: < 1.20.1-2+deb12u5

    Update to 1.20.1-2+deb12u5

  • krb5 Debian:13

    Versions
    • 1.21.3-5
    Affected ranges
    • ECOSYSTEM: < 1.21.3-5+deb13u1

    Update to 1.21.3-5+deb13u1

  • krb5 Debian:14

    Versions
    • 1.21.3-5
    • 1.22.1-1
    • 1.22.1-2
    Affected ranges
    • ECOSYSTEM: < 1.22.1-2.1

    Update to 1.22.1-2.1

  • krb5 Ubuntu:22.04:LTS

    Versions
    • 1.18.3-6
    • 1.18.3-7
    • 1.19.2-0ubuntu1
    • 1.19.2-1
    • 1.19.2-2
    • 1.19.2-2ubuntu0.1
    • 1.19.2-2ubuntu0.2
    • 1.19.2-2ubuntu0.3
    • 1.19.2-2ubuntu0.4
    • 1.19.2-2ubuntu0.5
    • 1.19.2-2ubuntu0.6
    • 1.19.2-2ubuntu0.7
    Affected ranges
    • ECOSYSTEM: < 1.19.2-2ubuntu0.8

    Update to 1.19.2-2ubuntu0.8

  • krb5 Ubuntu:24.04:LTS

    Versions
    • 1.20.1-3ubuntu1
    • 1.20.1-5build1
    • 1.20.1-6ubuntu1
    • 1.20.1-6ubuntu2
    • 1.20.1-6ubuntu2.1
    • 1.20.1-6ubuntu2.2
    • 1.20.1-6ubuntu2.3
    • 1.20.1-6ubuntu2.4
    • 1.20.1-6ubuntu2.5
    • 1.20.1-6ubuntu2.6
    Affected ranges
    • ECOSYSTEM: < 1.20.1-6ubuntu2.7

    Update to 1.20.1-6ubuntu2.7

  • krb5 Ubuntu:25.10

    Versions
    • 1.21.3-4ubuntu2
    • 1.21.3-5ubuntu1
    • 1.21.3-5ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • krb5 Ubuntu:26.04:LTS

    Versions
    • 1.21.3-5ubuntu2
    • 1.22.1-2
    • 1.22.1-2ubuntu2
    • 1.22.1-2ubuntu3
    • 1.22.1-2ubuntu4
    Affected ranges
    • ECOSYSTEM: < 1.22.1-2ubuntu4.1

    Update to 1.22.1-2ubuntu4.1

Original sources

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