Bug 2463370 (CVE-2026-40355) - CVE-2026-40355 krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism
Summary: CVE-2026-40355 krb5: MIT Kerberos 5: Denial of Service via NULL pointer deref...
Keywords:
Status: NEW
Alias: CVE-2026-40355
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: 2463393 2463394 2463398
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-28 07:02 UTC by OSIDB Bzimport
Modified: 2026-04-28 17:44 UTC (History)
4 users (show)

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

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-04-28 07:02:08 UTC 
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference 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, causing the process to terminate in parse_nego_message.
Note You need to log in before you can comment on or make changes to this bug.