HighFix available
krb5 — security advisory
An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.
- Products
- krb5
- Affected versions
- Not specified
- Fixed versions
- 1.15.3-r0
- CVEs
- CVE-2018-5709
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:00 UTC · Revision 1
Source evidence
An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.
osv:ALPINE-CVE-2018-5709
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
krb5
Fixed versions: 1.15.3-r0
Complete source record
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"modified": "2026-10-23T17:17:55.274196615Z",
"provider": "osv",
"upstream": [
"CVE-2018-5709"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2018-5709"
]
},
"related_cves": [
{
"value": "CVE-2018-5709",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 415199,
"published_at": "2018-01-16T09:29:00.5+00:00"
}