Bug 2463368 (CVE-2026-40356) - CVE-2026-40356 krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read
Summary: CVE-2026-40356 krb5: MIT Kerberos 5 (krb5): Denial of Service via integer und...
Keywords:
Status: NEW
Alias: CVE-2026-40356
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2463395 2463396 2463397
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-28 07:02 UTC by OSIDB Bzimport
Modified: 2026-06-10 13:36 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2026:16994 0 None None None 2026-05-13 10:42:00 UTC
Red Hat Product Errata RHBA-2026:16996 0 None None None 2026-05-13 10:57:58 UTC
Red Hat Product Errata RHBA-2026:16998 0 None None None 2026-05-13 11:38:29 UTC
Red Hat Product Errata RHBA-2026:17049 0 None None None 2026-05-13 13:39:14 UTC
Red Hat Product Errata RHBA-2026:17057 0 None None None 2026-05-13 13:44:37 UTC
Red Hat Product Errata RHBA-2026:18060 0 None None None 2026-05-19 11:18:44 UTC
Red Hat Product Errata RHBA-2026:18061 0 None None None 2026-05-18 12:13:41 UTC
Red Hat Product Errata RHBA-2026:18066 0 None None None 2026-05-18 13:43:07 UTC
Red Hat Product Errata RHBA-2026:18067 0 None None None 2026-05-18 14:25:58 UTC
Red Hat Product Errata RHBA-2026:19543 0 None None None 2026-05-20 07:27:31 UTC
Red Hat Product Errata RHBA-2026:19679 0 None None None 2026-05-20 13:23:21 UTC
Red Hat Product Errata RHSA-2026:16799 0 None None None 2026-05-13 05:45:30 UTC
Red Hat Product Errata RHSA-2026:19145 0 None None None 2026-05-19 16:09:37 UTC
Red Hat Product Errata RHSA-2026:19357 0 None None None 2026-05-19 21:40:05 UTC
Red Hat Product Errata RHSA-2026:24683 0 None None None 2026-06-09 00:56:37 UTC
Red Hat Product Errata RHSA-2026:24685 0 None None None 2026-06-09 00:43:15 UTC
Red Hat Product Errata RHSA-2026:24686 0 None None None 2026-06-09 00:51:52 UTC

Description OSIDB Bzimport 2026-04-28 07:02:01 UTC 
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read 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, possibly causing the process to terminate in parse_message.
Comment 2 errata-xmlrpc 2026-05-13 05:45:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:16799 https://access.redhat.com/errata/RHSA-2026:16799
Comment 3 errata-xmlrpc 2026-05-19 16:09:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:19145 https://access.redhat.com/errata/RHSA-2026:19145
Comment 4 errata-xmlrpc 2026-05-19 21:40:04 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:19357 https://access.redhat.com/errata/RHSA-2026:19357
Comment 11 errata-xmlrpc 2026-06-09 00:43:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:24685 https://access.redhat.com/errata/RHSA-2026:24685
Comment 12 errata-xmlrpc 2026-06-09 00:51:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:24686 https://access.redhat.com/errata/RHSA-2026:24686
Comment 13 errata-xmlrpc 2026-06-09 00:56:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:24683 https://access.redhat.com/errata/RHSA-2026:24683
Note You need to log in before you can comment on or make changes to this bug.