Description
plugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin code that is specific to Red Hat.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | krb5 1.5 | krb5 1.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | krb5 | 1.15.2-2 | — |
| Debian 13 | krb5 | 1.15.2-2 | — |
| Debian 12 | krb5 | 1.15.2-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | krb5 | 1.13.2+dfsg-5ubuntu2.2+esm3 | — |
| Ubuntu Pro 14.04 LTS | krb5 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | krb5 | 1.12.5-40.16.1 | SUSE-SU-2017:2948-1 |
| SLES 12 SP2 | krb5 | 1.12.5-40.16.1 | SUSE-SU-2017:2948-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | krb5 | 1.12.5-40.16.1 | SUSE-SU-2017:2948-1 |
| SLES for SAP 12 SP2 | krb5 | 1.12.5-40.16.1 | SUSE-SU-2017:2948-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | krb5 | 1.15.3-r0 | — |
| Alpine v3.23 | krb5 | 1.15.3-r0 | — |
| Alpine v3.22 | krb5 | 1.15.3-r0 | — |
| Alpine v3.21 | krb5 | 1.15.3-r0 | — |
| Alpine v3.20 | krb5 | 1.15.3-r0 | — |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | krb5 | 1.15.3-r0 | — |
| Alpine v3.18 | krb5 | 1.15.3-r0 | — |
| Alpine v3.17 | krb5 | 1.15.3-r0 | — |
| Alpine v3.16 | krb5 | 1.15.3-r0 | — |
| Alpine v3.15 | krb5 | 1.15.3-r0 | — |
| Alpine v3.14 | krb5 | 1.15.3-r0 | — |
| Alpine v3.13 | krb5 | 1.15.3-r0 | — |
| Alpine v3.12 | krb5 | 1.15.3-r0 | — |
| Alpine v3.11 | krb5 | 1.15.3-r0 | — |
| Alpine v3.10 | krb5 | 1.15.3-r0 | — |
| Alpine v3.9 | krb5 | 1.15.3-r0 | — |
| Alpine v3.8 | krb5 | 1.15.3-r0 | — |
| Alpine v3.7 | krb5 | 1.15.3-r0 | — |
Advisories 1
- SUSE-SU-2017:2948-1 Security update for krb5 SUSE / openSUSE Security Updates · Feb 4, 2026