HighFix available
libssh — security advisory
A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.
- Products
- libssh
- Affected versions
- 0.10.5-2, 0.10.5-3, 0.10.5-3+hurd.1, 0.10.6-0+deb12u1, 0.10.6-0+deb12u2, 0.11.2-1, 0.11.2-1+deb13u1, 0.11.3-1
- Fixed versions
- 0.10.6-0+deb12u3, 0.11.5-0+deb13u1, 0.12.0-1
- CVEs
- CVE-2026-3731
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 13:26 UTC · Revision 1
Source evidence
A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.
osv:DEBIAN-CVE-2026-3731
libssh
Fixed versions: 0.10.6-0+deb12u3
libssh
Fixed versions: 0.11.5-0+deb13u1
libssh
Fixed versions: 0.12.0-1
Complete source record
{
"id": "6e4bcbaf1b18c0979865f8e24f2add0d3997156a2c8a22ad22eb78e6c652e45c",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-3731",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-3731",
"summary": "A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftp_extensions_get_name/sftp_extensions_get_data of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.",
"evidence": "osv:DEBIAN-CVE-2026-3731",
"products": [
{
"name": {
"value": "libssh",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.10.6-0+deb12u3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "0.10.5-2",
"evidence": "/affected/0/versions"
},
{
"value": "0.10.5-3",
"evidence": "/affected/0/versions"
},
{
"value": "0.10.5-3+hurd.1",
"evidence": "/affected/0/versions"
},
{
"value": "0.10.6-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "0.10.6-0+deb12u2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.11.5-0+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "0.11.2-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.11.2-1+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "0.11.3-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.12.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "0.11.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.11.3-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-3731",
"aliases": [
"DEBIAN-CVE-2026-3731"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.10.6-0+deb12u3"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/debian/libssh?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.10.5-2",
"0.10.5-3",
"0.10.5-3+hurd.1",
"0.10.6-0+deb12u1",
"0.10.6-0+deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3731.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"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-2026-3731.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.12.0-1"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/debian/libssh?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"0.11.2-1",
"0.11.3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-3731.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-20T21:00:06.125972571Z",
"provider": "osv",
"upstream": [
"CVE-2026-3731"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-3731"
]
},
"related_cves": [
{
"value": "CVE-2026-3731",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 390701,
"published_at": "2026-03-08T11:15:50.307+00:00"
}