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
high
high
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: 2026-04-28 08:50 UTC (History)
4 users (show)

Fixed In Version:
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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.
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