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Fencer Intel
medium 6.5

CVE-2026-107778 json

MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()

published last mo. modified last mo. also EUVD-2026-95256

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more tickets than ticket_info entries through gss_accept_sec_context() to crash GSS-API acceptor services, causing denial of service.

Patch / fix

  • krb5 hummingbird 1 1.22.2-10.3.hum1
  • libkadm5 hummingbird 1 1.22.2-10.3.hum1
  • krb5-libs hummingbird 1 1.22.2-10.3.hum1
  • krb5-tests hummingbird 1 1.22.2-10.3.hum1
  • krb5-pkinit hummingbird 1 1.22.2-10.3.hum1
  • krb5-server hummingbird 1 1.22.2-10.3.hum1
  • krb5-server-ldap hummingbird 1 1.22.2-10.3.hum1
  • krb5-workstation hummingbird 1 1.22.2-10.3.hum1

red hat advisories RHSA-2026:80481

  • krb5 SLE Micro 5.5 1.20.1-150500.3.26.1

suse advisories SUSE-SU-2026:4906-1

  • krb5 openSUSE Tumbleweed 1.22.2-5.1

opensuse advisories openSUSE-SU-2026:12296-1

  • krb5 Azure Linux 3.0 1.21.3-6

azure linux advisories AZL-106839

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-107778 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-107778 updated cvss 6.5

krb5: krb5: Denial of Service via crafted forwarded credentials

  • Red Hat Enterprise Linux 6 libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, krb5 1.21.3-11.el10, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, krb5-workstation, +1 more Red Hat Enterprise Linux 8 libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, krb5-workstation, +1 more Red Hat Enterprise Linux 9 libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, krb5-workstation, +2 more Red Hat Enterprise Linux 10 krb5 1.21.3-11.el10
    affected: workaround, no fix available
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-kserve-storage-initializer-rhel9
    under investigation
  • Red Hat Hardened Images krb5 1.22.2-10.3.hum1, libkadm5 1.22.2-10.3.hum1, krb5-libs 1.22.2-10.3.hum1, krb5-tests 1.22.2-10.3.hum1, krb5-pkinit 1.22.2-10.3.hum1, krb5-server 1.22.2-10.3.hum1, +3 more
    fixed: vendor fix RHSA-2026:80481
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 7.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • MIT krb5

Classification

Weakness

References

Sources

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