Medium
sssd — security advisory
A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. When handling Generic Security Services Application Programming Interface (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and unexpectedly terminate.
- Products
- sssd
- Affected versions
- 2.10.1-1, 2.10.1-2, 2.11.1-1, 2.11.1-2, 2.11.1-2.1, 2.12.0-1, 2.12.0-2, 2.12.0-3~exp0, 2.12.0-4, 2.13.1-1, 2.13.1-2, 2.13.1-3, 2.8.2-4, 2.8.2-4+deb12u1, 2.9.1-1, 2.9.1-2, 2.9.2-1, 2.9.4-1, 2.9.4-1.1, 2.9.4-1.1~exp1, 2.9.4-2, 2.9.5-1, 2.9.5-2, 2.9.5-3, 2.9.5-4, 2.9.5-5
- Fixed versions
- Not specified
- CVEs
- CVE-2026-104039
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 09:03 UTC · Revision 1
Source evidence
A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. When handling Generic Security Services Application Programming Interface (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and unexpectedly terminate.
osv:DEBIAN-CVE-2026-104039
sssd
Fixed versions: Not specified
sssd
Fixed versions: Not specified
Complete source record
{
"id": "15066a0641dedc4289ecf7829f63104b22201fdb266d74edf4ff99fa4d229b83",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-104039",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-104039",
"summary": "A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system authentication services. When handling Generic Security Services Application Programming Interface (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an additional request over the same connection, causing the service to access invalid memory and unexpectedly terminate.",
"evidence": "osv:DEBIAN-CVE-2026-104039",
"products": [
{
"name": {
"value": "sssd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.10.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.11.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.11.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.11.1-2.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.0-3~exp0",
"evidence": "/affected/0/versions"
},
{
"value": "2.12.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.13.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.13.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.13.1-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.8.2-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.8.2-4+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.4-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.4-1.1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.4-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.5-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.5-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.9.5-5",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "sssd",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.10.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.11.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.11.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.11.1-2.1",
"evidence": "/affected/1/versions"
},
{
"value": "2.12.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.12.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.12.0-3~exp0",
"evidence": "/affected/1/versions"
},
{
"value": "2.12.0-4",
"evidence": "/affected/1/versions"
},
{
"value": "2.13.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "2.13.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "2.13.1-3",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-104039",
"aliases": [
"DEBIAN-CVE-2026-104039"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "sssd",
"purl": "pkg:deb/debian/sssd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2.10.1-1",
"2.10.1-2",
"2.11.1-1",
"2.11.1-2",
"2.11.1-2.1",
"2.12.0-1",
"2.12.0-2",
"2.12.0-3~exp0",
"2.12.0-4",
"2.13.1-1",
"2.13.1-2",
"2.13.1-3",
"2.8.2-4",
"2.8.2-4+deb12u1",
"2.9.1-1",
"2.9.1-2",
"2.9.2-1",
"2.9.4-1",
"2.9.4-1.1",
"2.9.4-1.1~exp1",
"2.9.4-2",
"2.9.5-1",
"2.9.5-2",
"2.9.5-3",
"2.9.5-4",
"2.9.5-5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-104039.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "sssd",
"purl": "pkg:deb/debian/sssd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.10.1-2",
"2.11.1-1",
"2.11.1-2",
"2.11.1-2.1",
"2.12.0-1",
"2.12.0-2",
"2.12.0-3~exp0",
"2.12.0-4",
"2.13.1-1",
"2.13.1-2",
"2.13.1-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-104039.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-08T09:47:38.164025135Z",
"provider": "osv",
"upstream": [
"CVE-2026-104039"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-104039"
]
},
"related_cves": [
{
"value": "CVE-2026-104039",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 98915,
"published_at": "2026-10-06T02:17:03.013+00:00"
}