Description
The Heimdal Software Kerberos 5 implementation is vulnerable to a null pointer dereferance. An attacker with network access to an application that depends on the vulnerable code path can cause the application to crash.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Heimdal Software Kerberos | Heimdal Software Kerberos 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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | heimdal | No fix yet | — |
| Ubuntu 26.04 LTS | heimdal | No fix yet | — |
| Ubuntu 25.10 | heimdal | No fix yet | — |
| Ubuntu 24.04 LTS | heimdal | No fix yet | — |
| Ubuntu 22.04 LTS | heimdal | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | heimdal | 7.7.0+dfsg-1ubuntu1.1 | USN-5675-1 |
| Ubuntu 18.04 LTS | heimdal | 7.5.0+dfsg-1ubuntu0.1 | USN-5675-1 |
| Ubuntu Pro 16.04 LTS | heimdal | 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1 | USN-5675-1 |
| Ubuntu Pro 14.04 LTS | heimdal | 1.6~git20131207+dfsg-1ubuntu1.2+esm1 | USN-5675-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | 4.18.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | samba | No fix yet | — |
Advisories 2
- USN-5675-1 heimdal vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- WID-SEC-2023-0781 Heimdal: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Mar 27, 2023