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Fencer Vulns
high 7.5

CVE-2024-26461 json

Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/lib/gssapi/krb5/k5sealv3.c.

published 2024-02-26 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-23730

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/lib/gssapi/krb5/k5sealv3.c.

Patch / fix

  • krb5 Debian 14 1.22.1-2

debian advisories DEBIAN-CVE-2024-26461

  • krb5 Ubuntu 20.04 LTS 1.17-6ubuntu4.9
  • krb5 Ubuntu 22.04 LTS 1.19.2-2ubuntu0.6
  • krb5 Ubuntu 24.04 LTS 1.20.1-6ubuntu2.5
  • krb5 Ubuntu 25.10 1.21.3-4ubuntu2

ubuntu advisories UBUNTU-CVE-2024-26461

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
  • krb5 RHEL 8 1.18.2-27.el8_10

red hat advisories RHSA-2024:9331RHSA-2024:3268

  • krb5 Linux Micro 6.0 1.20.1-5.1
  • krb5 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.16.3-46.6.1
  • krb5 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +7 more 1.19.2-150400.3.9.1
  • krb5 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Micro 5.2 +3 more 1.19.2-150300.16.1
  • 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
  • krb5 SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS 1.16.3-150100.3.33.1

suse advisories SUSE-SU-2025:20051-1SUSE-SU-2024:1148-1SUSE-SU-2024:1006-1SUSE-SU-2024:1001-1SUSE-SU-2024:0999-1SUSE-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
  • libkadm5 AlmaLinux 8 1.18.2-27.el8_10
  • krb5-libs AlmaLinux 8 1.18.2-27.el8_10

almalinux advisories ALSA-2024:9331ALSA-2024:3268

  • krb5 Rocky Linux 8 1.18.2-27.el8_10

rocky linux advisories RLSA-2024:3268

  • krb5 CBL-Mariner 2.0 1.19.4-3
  • krb5 Azure Linux 3.0 1.21.3-1

azure linux advisories AZL-35454AZL-35481

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-2024-26461 updated cvss 5.9

krb5: Memory leak at /krb5/src/lib/gssapi/krb5/k5sealv3.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
    fixed: vendor fix RHSA-2024:9331
  • Red Hat Enterprise Linux BaseOS (v. 8) krb5 1.18.2-27.el8_10, libkadm5 1.18.2-27.el8_10, krb5-libs 1.18.2-27.el8_10, krb5-pkinit 1.18.2-27.el8_10, krb5-server 1.18.2-27.el8_10, krb5-server-ldap 1.18.2-27.el8_10, +1 more
    fixed: vendor fix RHSA-2024:3268
  • 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 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
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/LuMingYinDetect/krb5_defects/blob/main/krb5_detect_2.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • mit kerberos_5

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.