Summary
Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).
Security Fix(es):
* krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read (CVE-2026-40356)
* krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism (CVE-2026-40355)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 7
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | krb5-devel | 1.18.2-34.el8_10 |
| AlmaLinux · 8 | krb5-libs | 1.18.2-34.el8_10 |
| AlmaLinux · 8 | krb5-pkinit | 1.18.2-34.el8_10 |
| AlmaLinux · 8 | krb5-server | 1.18.2-34.el8_10 |
| AlmaLinux · 8 | krb5-server-ldap | 1.18.2-34.el8_10 |
| AlmaLinux · 8 | krb5-workstation | 1.18.2-34.el8_10 |
| AlmaLinux · 8 | libkadm5 | 1.18.2-34.el8_10 |
Vulnerabilities 2
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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…