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.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.18.0, <= 1.22.2CPE matchmatch criteria | cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* | ||
>= 1.18, < 1.22.3CPE match | cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
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Kerberos vulnerabilities
Jul 22, 2026krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism
Apr 28, 2026In 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.
Apr 14, 2026