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krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism

🗓️ 19 May 2026 22:17:47Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 15 Views

MIT Kerberos 5 DoS via NULL pointer in NegoEx; unauthenticated remote crash via gss_accept_sec_context.

Related
Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9aarch64krb5-debuginfo0:1.21.1-10.el9_8krb5-debuginfo-0:1.21.1-10.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64lekrb5-debuginfo0:1.21.1-10.el9_8krb5-debuginfo-0:1.21.1-10.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9s390xkrb5-debuginfo0:1.21.1-10.el9_8krb5-debuginfo-0:1.21.1-10.el9_8.s390x.rpm
Red Hat Enterprise Linux9x86_64krb5-debuginfo0:1.21.1-10.el9_8krb5-debuginfo-0:1.21.1-10.el9_8.x86_64.rpm
Red Hat Enterprise Linux9anykrb5-debuginfo0:1.21.1-10.el9_8.i686krb5-debuginfo-0:1.21.1-10.el9_8.i686.noarch.rpm
Red Hat Enterprise Linux9aarch64krb5-debugsource0:1.21.1-10.el9_8krb5-debugsource-0:1.21.1-10.el9_8.aarch64.rpm
Red Hat Enterprise Linux9ppc64lekrb5-debugsource0:1.21.1-10.el9_8krb5-debugsource-0:1.21.1-10.el9_8.ppc64le.rpm
Red Hat Enterprise Linux9s390xkrb5-debugsource0:1.21.1-10.el9_8krb5-debugsource-0:1.21.1-10.el9_8.s390x.rpm
Red Hat Enterprise Linux9x86_64krb5-debugsource0:1.21.1-10.el9_8krb5-debugsource-0:1.21.1-10.el9_8.x86_64.rpm
Red Hat Enterprise Linux9anykrb5-debugsource0:1.21.1-10.el9_8.i686krb5-debugsource-0:1.21.1-10.el9_8.i686.noarch.rpm
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03 Jul 2026 15:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.15.9
EPSS0.00461
SSVC
15