CVE-2026-40356CWE-191

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…

Medium · published April 28, 2026

CVSS v3.1
5.9
EPSS
1%
Percentile
55.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00783 · 55.5th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-04-28T00:00Z
EPSS history
Timeline
  • 28 APR 00:00Z
    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…
    cvelistv5