UnratedFix available
libssh vulnerability
Type: advisorySources: OSV
It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a client application queried extension data out of bounds, it could cause the application to crash, resulting in a denial of service, or exhibit unintended behavior.
- Products
- libssh
- Affected versions
- 0.10.5-3ubuntu1, 0.10.5-3ubuntu2, 0.10.6-2, 0.10.6-2build1, 0.10.6-2build2, 0.10.6-2ubuntu0.1, 0.10.6-2ubuntu0.2, 0.10.6-2ubuntu0.3, 0.11.1-1, 0.11.1-2, 0.11.2-1, 0.11.2-1build1, 0.11.2-1ubuntu0.1, 0.11.2-1ubuntu0.2, 0.6.3-3ubuntu3, 0.6.3-4.1, 0.6.3-4.2, 0.6.3-4.2ubuntu1, 0.6.3-4.3, 0.6.3-4.3ubuntu0.1, 0.6.3-4.3ubuntu0.2, 0.6.3-4.3ubuntu0.5, 0.6.3-4.3ubuntu0.6, 0.6.3-4.3ubuntu0.6+esm1, 0.6.3-4.3ubuntu0.6+esm2, 0.6.3-4.3ubuntu0.6+esm3, 0.6.3-4.3ubuntu0.6+esm4, 0.7.5-1, 0.8.0~20170825.94fa1e38-1, 0.8.0~20170825.94fa1e38-1build1, 0.8.0~20170825.94fa1e38-1ubuntu0.1, 0.8.0~20170825.94fa1e38-1ubuntu0.2, 0.8.0~20170825.94fa1e38-1ubuntu0.5, 0.8.0~20170825.94fa1e38-1ubuntu0.6, 0.8.0~20170825.94fa1e38-1ubuntu0.7, 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3, 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4, 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5, 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6, 0.9.0-1ubuntu1, 0.9.0-1ubuntu4, 0.9.0-1ubuntu5, 0.9.3-2ubuntu1, 0.9.3-2ubuntu2, 0.9.3-2ubuntu2.1, 0.9.3-2ubuntu2.2, 0.9.3-2ubuntu2.3, 0.9.3-2ubuntu2.4, 0.9.3-2ubuntu2.5, 0.9.3-2ubuntu2.5+esm1, 0.9.3-2ubuntu2.5+esm2, 0.9.3-2ubuntu2.5+esm3, 0.9.6-1, 0.9.6-1build1, 0.9.6-2, 0.9.6-2build1, 0.9.6-2ubuntu0.22.04.1, 0.9.6-2ubuntu0.22.04.2, 0.9.6-2ubuntu0.22.04.3, 0.9.6-2ubuntu0.22.04.4, 0.9.6-2ubuntu0.22.04.5, 0.9.6-2ubuntu0.22.04.6
- Fixed versions
- 0.10.6-2ubuntu0.4, 0.11.2-1ubuntu0.3, 0.6.3-4.3ubuntu0.6+esm5, 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7, 0.9.3-2ubuntu2.5+esm4, 0.9.6-2ubuntu0.22.04.7
- CVEs
- CVE-2026-3731
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:16 UTC · Revision 1
Source evidence
It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a client application queried extension data out of bounds, it could cause the application to crash, resulting in a denial of service, or exhibit unintended behavior.
osv:USN-8093-1
libssh
Fixed versions: 0.6.3-4.3ubuntu0.6+esm5
libssh
Fixed versions: 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7
libssh
Fixed versions: 0.9.3-2ubuntu2.5+esm4
libssh
Fixed versions: 0.9.6-2ubuntu0.22.04.7
libssh
Fixed versions: 0.10.6-2ubuntu0.4
libssh
Fixed versions: 0.11.2-1ubuntu0.3
Complete source record
{
"id": "50ee80239956f3cdd45f2782a473824c7922b7137459c40ddc9b23733ecdec24",
"url": "https://osv.dev/vulnerability/USN-8093-1",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "libssh vulnerability",
"summary": "It was discovered that libssh incorrectly performed bounds checking when processing SFTP extensions. If a client application queried extension data out of bounds, it could cause the application to crash, resulting in a denial of service, or exhibit unintended behavior.",
"evidence": "osv:USN-8093-1",
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{
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{
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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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"evidence": "/affected/1/versions"
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{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.1",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.2",
"evidence": "/affected/1/versions"
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{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.5",
"evidence": "/affected/1/versions"
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{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.6",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.7",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5",
"evidence": "/affected/1/versions"
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{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6",
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]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.3-2ubuntu2.5+esm4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "0.9.0-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.0-1ubuntu4",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.0-1ubuntu5",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu1",
"evidence": "/affected/2/versions"
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{
"value": "0.9.3-2ubuntu2",
"evidence": "/affected/2/versions"
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{
"value": "0.9.3-2ubuntu2.1",
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{
"value": "0.9.3-2ubuntu2.2",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu2.3",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu2.4",
"evidence": "/affected/2/versions"
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{
"value": "0.9.3-2ubuntu2.5",
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{
"value": "0.9.3-2ubuntu2.5+esm1",
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{
"value": "0.9.3-2ubuntu2.5+esm2",
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{
"value": "0.9.3-2ubuntu2.5+esm3",
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]
},
{
"name": {
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},
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{
"value": "0.9.6-2ubuntu0.22.04.7",
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],
"affected_versions": [
{
"value": "0.9.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2build1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2ubuntu0.22.04.1",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2ubuntu0.22.04.2",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2ubuntu0.22.04.3",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2ubuntu0.22.04.4",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2ubuntu0.22.04.5",
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{
"value": "0.9.6-2ubuntu0.22.04.6",
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]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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{
"value": "0.10.6-2ubuntu0.4",
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],
"affected_versions": [
{
"value": "0.10.5-3ubuntu1",
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},
{
"value": "0.10.5-3ubuntu2",
"evidence": "/affected/4/versions"
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{
"value": "0.10.6-2",
"evidence": "/affected/4/versions"
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{
"value": "0.10.6-2build1",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.6-2build2",
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},
{
"value": "0.10.6-2ubuntu0.1",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.6-2ubuntu0.2",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.6-2ubuntu0.3",
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}
]
},
{
"name": {
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},
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{
"value": "0.11.2-1ubuntu0.3",
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],
"affected_versions": [
{
"value": "0.11.1-1",
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{
"value": "0.11.1-2",
"evidence": "/affected/5/versions"
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{
"value": "0.11.2-1",
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{
"value": "0.11.2-1build1",
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{
"value": "0.11.2-1ubuntu0.1",
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{
"value": "0.11.2-1ubuntu0.2",
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]
}
],
"severity": "unknown",
"structured": {
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"aliases": [
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],
"affected": [
{
"ranges": [
{
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{
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}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Fxenial",
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},
"versions": [
"0.6.3-3ubuntu3",
"0.6.3-4.1",
"0.6.3-4.2",
"0.6.3-4.2ubuntu1",
"0.6.3-4.3",
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"0.6.3-4.3ubuntu0.6+esm3",
"0.6.3-4.3ubuntu0.6+esm4"
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{
"id": "CVE-2026-3731",
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{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
},
{
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"score": "medium"
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]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
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"binary_version": "0.6.3-4.3ubuntu0.6+esm5"
},
{
"binary_name": "libssh-gcrypt-4",
"binary_version": "0.6.3-4.3ubuntu0.6+esm5"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
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{
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{
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},
{
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}
]
}
],
"package": {
"name": "libssh",
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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"0.8.0~20170825.94fa1e38-1build1",
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"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4",
"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5",
"0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6"
],
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8093-1.json",
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{
"id": "CVE-2026-3731",
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{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
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},
{
"type": "Ubuntu",
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]
}
],
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}
},
"ecosystem_specific": {
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{
"binary_name": "libssh-4",
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},
{
"binary_name": "libssh-gcrypt-4",
"binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"0.9.0-1ubuntu1",
"0.9.0-1ubuntu4",
"0.9.0-1ubuntu5",
"0.9.3-2ubuntu1",
"0.9.3-2ubuntu2",
"0.9.3-2ubuntu2.1",
"0.9.3-2ubuntu2.2",
"0.9.3-2ubuntu2.3",
"0.9.3-2ubuntu2.4",
"0.9.3-2ubuntu2.5",
"0.9.3-2ubuntu2.5+esm1",
"0.9.3-2ubuntu2.5+esm2",
"0.9.3-2ubuntu2.5+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8093-1.json",
"cves_map": {
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{
"id": "CVE-2026-3731",
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{
"type": "CVSS_V3",
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},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssh-4",
"binary_version": "0.9.3-2ubuntu2.5+esm4"
},
{
"binary_name": "libssh-gcrypt-4",
"binary_version": "0.9.3-2ubuntu2.5+esm4"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.6-2ubuntu0.22.04.7"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.9.6-1",
"0.9.6-1build1",
"0.9.6-2",
"0.9.6-2build1",
"0.9.6-2ubuntu0.22.04.1",
"0.9.6-2ubuntu0.22.04.2",
"0.9.6-2ubuntu0.22.04.3",
"0.9.6-2ubuntu0.22.04.4",
"0.9.6-2ubuntu0.22.04.5",
"0.9.6-2ubuntu0.22.04.6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8093-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-3731",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssh-4",
"binary_version": "0.9.6-2ubuntu0.22.04.7"
},
{
"binary_name": "libssh-gcrypt-4",
"binary_version": "0.9.6-2ubuntu0.22.04.7"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.10.6-2ubuntu0.4"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=noble",
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},
"versions": [
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"0.10.5-3ubuntu2",
"0.10.6-2",
"0.10.6-2build1",
"0.10.6-2build2",
"0.10.6-2ubuntu0.1",
"0.10.6-2ubuntu0.2",
"0.10.6-2ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8093-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-3731",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
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{
"binary_name": "libssh-4",
"binary_version": "0.10.6-2ubuntu0.4"
},
{
"binary_name": "libssh-gcrypt-4",
"binary_version": "0.10.6-2ubuntu0.4"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.11.2-1ubuntu0.3"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=questing",
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},
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],
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8093-1.json",
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{
"id": "CVE-2026-3731",
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{
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},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
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},
{
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}
]
}
],
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}
},
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{
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}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-27T04:16:47.425885508Z",
"provider": "osv",
"upstream": [
"CVE-2026-3731",
"UBUNTU-CVE-2026-3731"
],
"references": [
"https://ubuntu.com/security/notices/USN-8093-1",
"https://ubuntu.com/security/CVE-2026-3731"
]
},
"related_cves": [
{
"value": "CVE-2026-3731",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 460200,
"published_at": "2026-03-16T10:57:11+00:00"
}