Critical
libpam-krb5, sssd — security advisory
pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.
- Products
- libpam-krb5, sssd
- Affected versions
- 1.12.5-2, 1.13.1-2, 1.13.2-1, 1.13.3-1, 1.13.4-1, 1.13.4-1ubuntu1, 1.13.4-1ubuntu1.1, 1.13.4-1ubuntu1.10, 1.13.4-1ubuntu1.11, 1.13.4-1ubuntu1.12, 1.13.4-1ubuntu1.13, 1.13.4-1ubuntu1.14, 1.13.4-1ubuntu1.15, 1.13.4-1ubuntu1.15+esm1, 1.13.4-1ubuntu1.2, 1.13.4-1ubuntu1.5, 1.13.4-1ubuntu1.6, 1.13.4-1ubuntu1.7, 1.13.4-1ubuntu1.8, 1.13.4-1ubuntu1.9, 1.15.3-2ubuntu1, 1.15.3-3ubuntu1, 1.16.0-5ubuntu1, 1.16.0-5ubuntu2, 1.16.1-1ubuntu1, 1.16.1-1ubuntu1.1, 1.16.1-1ubuntu1.2, 1.16.1-1ubuntu1.3, 1.16.1-1ubuntu1.4, 1.16.1-1ubuntu1.5, 1.16.1-1ubuntu1.6, 1.16.1-1ubuntu1.7, 1.16.1-1ubuntu1.8, 1.16.1-1ubuntu1.8+esm1, 2.10.1-2ubuntu4, 2.10.1-2ubuntu5, 2.10.1-2ubuntu5.1, 2.10.1-2ubuntu5.2, 2.10.1-2ubuntu5.3, 2.10.1-2ubuntu7, 2.12.0-1ubuntu3, 2.12.0-1ubuntu4, 2.12.0-1ubuntu5, 2.12.0-1ubuntu5.1, 2.12.0-1ubuntu5.2, 2.12.0-1ubuntu5.3, 2.12.0-1ubuntu5.4, 2.12.0-1ubuntu5.5, 2.12.0-4ubuntu1, 2.12.0-4ubuntu2, 2.12.0-4ubuntu3, 2.12.0-4ubuntu4, 2.2.0-4ubuntu1, 2.2.2-1, 2.2.2-1ubuntu1, 2.2.3-1.1ubuntu1, 2.2.3-2, 2.2.3-3, 2.2.3-3ubuntu0.1, 2.2.3-3ubuntu0.10, 2.2.3-3ubuntu0.11, 2.2.3-3ubuntu0.12, 2.2.3-3ubuntu0.13, 2.2.3-3ubuntu0.13+esm1, 2.2.3-3ubuntu0.2, 2.2.3-3ubuntu0.3, 2.2.3-3ubuntu0.4, 2.2.3-3ubuntu0.6, 2.2.3-3ubuntu0.7, 2.2.3-3ubuntu0.8, 2.2.3-3ubuntu0.9, 2.4.1-2ubuntu4, 2.5.2-4ubuntu1, 2.5.2-4ubuntu3, 2.5.2-4ubuntu4, 2.6.1-1ubuntu3, 2.6.3-1ubuntu3, 2.6.3-1ubuntu3.1, 2.6.3-1ubuntu3.2, 2.6.3-1ubuntu3.3, 2.6.3-1ubuntu3.4, 2.6.3-1ubuntu3.5, 2.6.3-1ubuntu3.6, 2.6.3-1ubuntu3.8, 2.6.3-1ubuntu3.9, 2.9.1-2ubuntu2, 2.9.1-2ubuntu3, 2.9.2-1ubuntu2, 2.9.4-1.1ubuntu3, 2.9.4-1.1ubuntu5, 2.9.4-1.1ubuntu6, 2.9.4-1.1ubuntu6.1, 2.9.4-1.1ubuntu6.2, 2.9.4-1.1ubuntu6.3, 2.9.4-1.1ubuntu6.4, 2.9.4-1.1ubuntu6.5, 2.9.4-1.1ubuntu6.6, 2.9.4-1.1ubuntu6.7, 2.9.4-1.1ubuntu6.8, 2.9.4-1ubuntu1, 4.11-1, 4.11-1build1, 4.11-1build2, 4.11-1build3, 4.11-2, 4.11-2build1, 4.6-2, 4.6-2ubuntu0.1~esm1, 4.7-2, 4.7-2ubuntu0.1, 4.7-4, 4.8-1, 4.8-1ubuntu0.1, 4.8-2, 4.8-2ubuntu1, 4.9-2build1
- Fixed versions
- Not specified
- CVEs
- CVE-2023-3326
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:49 UTC · Revision 1
Source evidence
pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.
osv:UBUNTU-CVE-2023-3326
libpam-krb5
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
libpam-krb5
Fixed versions: Not specified
sssd
Fixed versions: Not specified
Complete source record
{
"id": "9ef742a2d9b4a0a8b5e81e7a3727aa535c9c000a10bf9afd43f50108cfc23e21",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2023-3326",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2023-3326",
"summary": "pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.",
"evidence": "osv:UBUNTU-CVE-2023-3326",
"products": [
{
"name": {
"value": "libpam-krb5",
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},
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"affected_versions": [
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
}
]
},
{
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{
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{
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},
{
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{
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{
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{
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{
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{
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{
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{
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{
"value": "1.13.4-1ubuntu1.7",
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{
"value": "1.13.4-1ubuntu1.8",
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{
"value": "1.13.4-1ubuntu1.9",
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{
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{
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{
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{
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{
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{
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{
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]
},
{
"name": {
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},
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"affected_versions": [
{
"value": "4.7-4",
"evidence": "/affected/3/versions"
},
{
"value": "4.8-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.8-1ubuntu0.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "sssd",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.15.3-2ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "1.15.3-3ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.0-5ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.0-5ubuntu2",
"evidence": "/affected/4/versions"
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{
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{
"value": "1.16.1-1ubuntu1.1",
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},
{
"value": "1.16.1-1ubuntu1.2",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.3",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.4",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.5",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.6",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.7",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.8",
"evidence": "/affected/4/versions"
},
{
"value": "1.16.1-1ubuntu1.8+esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libpam-krb5",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "4.8-2",
"evidence": "/affected/5/versions"
},
{
"value": "4.8-2ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "sssd",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.2.0-4ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.2-1",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.2-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-1.1ubuntu1",
"evidence": "/affected/6/versions"
},
{
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"evidence": "/affected/6/versions"
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{
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"evidence": "/affected/6/versions"
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{
"value": "2.2.3-3ubuntu0.1",
"evidence": "/affected/6/versions"
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{
"value": "2.2.3-3ubuntu0.2",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.3",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.4",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.6",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.7",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.8",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.9",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.10",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.11",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.12",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.13",
"evidence": "/affected/6/versions"
},
{
"value": "2.2.3-3ubuntu0.13+esm1",
"evidence": "/affected/6/versions"
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{
"name": {
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"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.9-2build1",
"evidence": "/affected/7/versions"
},
{
"value": "4.11-1",
"evidence": "/affected/7/versions"
},
{
"value": "4.11-1build1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "sssd",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.4.1-2ubuntu4",
"evidence": "/affected/8/versions"
},
{
"value": "2.5.2-4ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "2.5.2-4ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "2.5.2-4ubuntu4",
"evidence": "/affected/8/versions"
},
{
"value": "2.6.1-1ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "2.6.3-1ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "2.6.3-1ubuntu3.1",
"evidence": "/affected/8/versions"
},
{
"value": "2.6.3-1ubuntu3.2",
"evidence": "/affected/8/versions"
},
{
"value": "2.6.3-1ubuntu3.3",
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},
{
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{
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{
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{
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{
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{
"name": {
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{
"value": "4.11-1build1",
"evidence": "/affected/9/versions"
},
{
"value": "4.11-1build2",
"evidence": "/affected/9/versions"
},
{
"value": "4.11-1build3",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
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"evidence": "/affected/10/package/name"
},
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"affected_versions": [
{
"value": "2.9.1-2ubuntu2",
"evidence": "/affected/10/versions"
},
{
"value": "2.9.1-2ubuntu3",
"evidence": "/affected/10/versions"
},
{
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{
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{
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{
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},
{
"value": "2.9.4-1.1ubuntu6",
"evidence": "/affected/10/versions"
},
{
"value": "2.9.4-1.1ubuntu6.1",
"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
"value": "2.9.4-1.1ubuntu6.3",
"evidence": "/affected/10/versions"
},
{
"value": "2.9.4-1.1ubuntu6.4",
"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
"value": "2.9.4-1.1ubuntu6.6",
"evidence": "/affected/10/versions"
},
{
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"evidence": "/affected/10/versions"
},
{
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]
},
{
"name": {
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"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.11-2",
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}
]
},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
"value": "2.10.1-2ubuntu4",
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},
{
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"evidence": "/affected/12/versions"
},
{
"value": "2.10.1-2ubuntu5.1",
"evidence": "/affected/12/versions"
},
{
"value": "2.10.1-2ubuntu5.2",
"evidence": "/affected/12/versions"
},
{
"value": "2.10.1-2ubuntu5.3",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "libpam-krb5",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.11-2build1",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "sssd",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.12.0-1ubuntu5",
"evidence": "/affected/14/versions"
},
{
"value": "2.12.0-4ubuntu1",
"evidence": "/affected/14/versions"
},
{
"value": "2.12.0-4ubuntu2",
"evidence": "/affected/14/versions"
},
{
"value": "2.12.0-4ubuntu3",
"evidence": "/affected/14/versions"
},
{
"value": "2.12.0-4ubuntu4",
"evidence": "/affected/14/versions"
}
]
},
{
"name": {
"value": "libpam-krb5",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.11-2",
"evidence": "/affected/15/versions"
},
{
"value": "4.11-2build1",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "sssd",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.1-2ubuntu5",
"evidence": "/affected/16/versions"
},
{
"value": "2.10.1-2ubuntu7",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu3",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu4",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu5",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu5.1",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu5.2",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu5.3",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu5.4",
"evidence": "/affected/16/versions"
},
{
"value": "2.12.0-1ubuntu5.5",
"evidence": "/affected/16/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2023-3326",
"aliases": [
"UBUNTU-CVE-2023-3326"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "low"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libpam-krb5",
"purl": "pkg:deb/ubuntu/libpam-krb5?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
"4.6-2",
"4.6-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-3326.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-heimdal",
"binary_version": "4.6-2ubuntu0.1~esm1"
},
{
"binary_name": "libpam-krb5",
"binary_version": "4.6-2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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],
"modified": "2026-10-17T12:56:05.978683988Z",
"provider": "osv",
"upstream": [
"CVE-2023-3326"
],
"references": [
"https://ubuntu.com/security/CVE-2023-3326",
"https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc",
"https://seclists.org/oss-sec/2023/q2/245",
"https://www.cve.org/CVERecord?id=CVE-2023-3326"
]
},
"related_cves": [
{
"value": "CVE-2023-3326",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354818,
"published_at": "2023-06-22T17:15:00+00:00"
}