HighFix available
libssh — security advisory
A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.
- Products
- libssh
- Affected versions
- 0.11.2-1, 0.11.2-1+deb13u1, 0.11.3-1, 0.12.0-1, 0.12.0-2, 0.12.0-3
- Fixed versions
- 0.11.5-0+deb13u1, 0.12.1-1
- CVEs
- CVE-2026-15370
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 23:06 UTC · Revision 1
Source evidence
A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.
osv:DEBIAN-CVE-2026-15370
libssh
Fixed versions: 0.11.5-0+deb13u1
libssh
Fixed versions: 0.12.1-1
Complete source record
{
"id": "2e087e5ab9ba026ac4b51a03027d01fe7d8eff300ae32227a1f77d62559977fa",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-15370",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-15370",
"summary": "A flaw was found in libssh. During SFTP server directory listing, the longname field is constructed with unsafe concatenation into a fixed-size stack buffer. When a client causes the server to list attacker-controlled filenames, sufficiently long names can overflow that stack buffer and may lead to crashes or possible code execution on the server.",
"evidence": "osv:DEBIAN-CVE-2026-15370",
"products": [
{
"name": {
"value": "libssh",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.11.5-0+deb13u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "0.11.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.11.2-1+deb13u1",
"evidence": "/affected/0/versions"
},
{
"value": "0.11.3-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.12.1-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "0.11.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.11.3-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "0.12.0-3",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-15370",
"aliases": [
"DEBIAN-CVE-2026-15370"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.11.5-0+deb13u1"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/debian/libssh?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"0.11.2-1",
"0.11.2-1+deb13u1",
"0.11.3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15370.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.12.1-1"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/debian/libssh?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.11.2-1",
"0.11.3-1",
"0.12.0-1",
"0.12.0-2",
"0.12.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-15370.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-17T00:00:08.375018010Z",
"provider": "osv",
"upstream": [
"CVE-2026-15370"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-15370"
]
},
"related_cves": [
{
"value": "CVE-2026-15370",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 349395,
"published_at": "2026-07-21T09:16:53.683+00:00"
}