Description
Double free vulnerabilities in the error handling code for ASN.1 decoders in the (1) Key Distribution Center (KDC) library and (2) client library for MIT Kerberos 5 (krb5) 1.3.4 and earlier may allow remote attackers to execute arbitrary code.
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 | 1.3.4-3 | — |
| Debian 13 | krb5 | 1.3.4-3 | — |
| Debian 12 | krb5 | 1.3.4-3 | — |
| Debian 3.0 | krb5 | 1.2.4-5woody6 | DSA-543-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 3 | krb5 +4 | 1.2.7-28 | RHSA-2004:350 |
Advisories 2
- RHSA-2004:350 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-543-1 krb5 -- several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- VU#795632 third-party-advisory
- CLA-2004:860 vendor-advisory
- oval:org.mitre.oval:def:10709 vdb-entry signature
- RHSA-2004:350 vendor-advisory
- oval:org.mitre.oval:def:4936 vdb-entry signature
- 2004-0045 vendor-advisory
- DSA-543 vendor-advisory
- TA04-247A third-party-advisory
- GLSA-200409-09 vendor-advisory
- 20040913 [OpenPKG-SA-2004.039] OpenPKG Security Advisory (kerberos) mailing-list
- http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2004-002-dblfree.txt
- 11078 vdb-entry
- kerberos-kdc-double-free(17157) vdb-entry