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Fencer Vulns
medium 5.5

CVE-2024-26462 json

Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/kdc/ndr.c.

published 2024-02-26 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-23731

cvss
5.5
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 37%
public exploits
0
none known

Summary

Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/kdc/ndr.c.

Patch / fix

  • krb5 Debian 12 1.20.1-2+deb12u3
  • krb5 Debian 14, Debian 13 1.21.3-1

debian advisories DEBIAN-CVE-2024-26462

  • krb5 Ubuntu 24.04 LTS 1.20.1-6ubuntu2.5

ubuntu advisories UBUNTU-CVE-2024-26462

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • krb5 RHEL 9 1.21.1-3.el9
  • libkadm5 RHEL 9 1.21.1-3.el9
  • krb5-libs RHEL 9 1.21.1-3.el9
  • krb5-pkinit RHEL 9 1.21.1-3.el9
  • krb5-server RHEL 9 1.21.1-3.el9
  • krb5-server-ldap RHEL 9 1.21.1-3.el9
  • krb5-workstation RHEL 9 1.21.1-3.el9

red hat advisories RHSA-2024:9331

  • krb5 Linux Micro 6.0 1.20.1-5.1
  • krb5 SLE Module for Server Applications 15 SP5, SLE Module for Basesystem 15 SP5, SLE Micro 5.5 +1 more 1.20.1-150500.3.6.1

suse advisories SUSE-SU-2025:20051-1SUSE-SU-2024:0997-1

  • krb5 openSUSE Tumbleweed 1.21.2-3.1

opensuse advisories openSUSE-SU-2024:13921-1

  • libkadm5 AlmaLinux 9 1.21.1-3.el9
  • krb5-libs AlmaLinux 9 1.21.1-3.el9
  • krb5-pkinit AlmaLinux 9 1.21.1-3.el9
  • krb5-server AlmaLinux 9 1.21.1-3.el9
  • krb5-server-ldap AlmaLinux 9 1.21.1-3.el9
  • krb5-workstation AlmaLinux 9 1.21.1-3.el9

almalinux advisories ALSA-2024:9331

  • krb5 Azure Linux 3.0 1.21.3-1

azure linux advisories AZL-35480

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

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-2024-26462 updated cvss 7.5

krb5: Memory leak at /krb5/src/kdc/ndr.c

  • Red Hat Enterprise Linux 6 krb5, libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, +1 more Red Hat Enterprise Linux 7 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 9) krb5-devel 1.21.1-3.el9, krb5-debuginfo 1.21.1-3.el9, krb5-debugsource 1.21.1-3.el9, libkadm5-debuginfo 1.21.1-3.el9, krb5-libs-debuginfo 1.21.1-3.el9, krb5-pkinit-debuginfo 1.21.1-3.el9, +3 more Red Hat Enterprise Linux BaseOS (v. 9) krb5 1.21.1-3.el9, libkadm5 1.21.1-3.el9, krb5-libs 1.21.1-3.el9, krb5-pkinit 1.21.1-3.el9, krb5-server 1.21.1-3.el9, krb5-server-ldap 1.21.1-3.el9, +1 more
    fixed: vendor fix RHSA-2024:9331
  • Red Hat Enterprise Linux 8 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more Red Hat Enterprise Linux 10 krb5
    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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/LuMingYinDetect/krb5_defects/blob/main/krb5_detect_3.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.