Summary
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)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | krb5 | 1.19.2-2ubuntu0.8 |
| Ubuntu · 24.04 LTS 24.04:LTS | krb5 | 1.20.1-6ubuntu2.7 |
| Ubuntu · 26.04 LTS 26.04:LTS | krb5 | 1.22.1-2ubuntu4.1 |
Vulnerabilities 3
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Medium 5.9
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_…
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Medium 5.9
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an applic…
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Medium 5.0
Krb5: krb5: integer underflow in berval2tl_data() leads to heap out-of-bounds read
An integer underflow vulnerability was found in MIT krb5 in the berval2tl_data() function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c. The function performs an unsigned subtraction (bv_len - 2) without a prior bounds check. When bv_len is 0 or 1, the su…