Packages
- krb5 - MIT Kerberos Network Authentication Protocol
Details
It was discovered that Kerberos had an integer underflow vulnerability
in the berval2tl_data() function. An attacker could possibly use this issue
to cause Kerberos to crash, resulting in a denial of service.
(CVE-2026-11850)
It was discovered that Kerberos had vulnerabilities in its NegoEx mechanism
parsing. A remote attacker could possibly use these issues to cause
Kerberos to crash, resulting in a denial of service. (CVE-2026-40355,
CVE-2026-40356)
It was discovered that Kerberos had an integer underflow vulnerability
in the berval2tl_data() function. An attacker could possibly use this issue
to cause Kerberos to crash, resulting in a denial of service.
(CVE-2026-11850)
It was discovered that Kerberos had vulnerabilities in its NegoEx mechanism
parsing. A remote attacker could possibly use these issues to cause
Kerberos to crash, resulting in a denial of service. (CVE-2026-40355,
CVE-2026-40356)
Update instructions
After a standard system update you need to restart Kerberos to make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | krb5-admin-server – 1.22.1-2ubuntu4.1 | ||
| krb5-kdc – 1.22.1-2ubuntu4.1 | |||
| libkrb5-3 – 1.22.1-2ubuntu4.1 | |||
| 24.04 LTS noble | krb5-admin-server – 1.20.1-6ubuntu2.7 | ||
| krb5-kdc – 1.20.1-6ubuntu2.7 | |||
| libkrb5-3 – 1.20.1-6ubuntu2.7 | |||
| 22.04 LTS jammy | krb5-admin-server – 1.19.2-2ubuntu0.8 | ||
| krb5-kdc – 1.19.2-2ubuntu0.8 | |||
| libkrb5-3 – 1.19.2-2ubuntu0.8 | |||
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