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
- 0.10.5-3ubuntu1, 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, 0.11.3-1, 0.11.3-1ubuntu1, 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, 0.11.3-1ubuntu2, 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, 17:19 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:UBUNTU-CVE-2026-3731
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
libssh
Fixed versions: 0.11.3-1ubuntu2
Complete source record
{
"id": "f1bfec75458a5e8b72889ff3b121c38602593e7db62e08c5f7b6c1511f8766b0",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-3731",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-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:UBUNTU-CVE-2026-3731",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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{
"value": "0.6.3-4.3ubuntu0.6+esm5",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "0.6.3-3ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "0.6.3-4.1",
"evidence": "/affected/0/versions"
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{
"value": "0.6.3-4.2",
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{
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{
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"evidence": "/affected/0/versions"
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{
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{
"value": "0.6.3-4.3ubuntu0.2",
"evidence": "/affected/0/versions"
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{
"value": "0.6.3-4.3ubuntu0.5",
"evidence": "/affected/0/versions"
},
{
"value": "0.6.3-4.3ubuntu0.6",
"evidence": "/affected/0/versions"
},
{
"value": "0.6.3-4.3ubuntu0.6+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "0.6.3-4.3ubuntu0.6+esm2",
"evidence": "/affected/0/versions"
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{
"value": "0.6.3-4.3ubuntu0.6+esm3",
"evidence": "/affected/0/versions"
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{
"value": "0.6.3-4.3ubuntu0.6+esm4",
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{
"name": {
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{
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],
"affected_versions": [
{
"value": "0.7.5-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.8.0~20170825.94fa1e38-1build1",
"evidence": "/affected/1/versions"
},
{
"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"
},
{
"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"
},
{
"value": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6",
"evidence": "/affected/1/versions"
}
]
},
{
"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"
},
{
"value": "0.9.3-2ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"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"
},
{
"value": "0.9.3-2ubuntu2.5",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu2.5+esm1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu2.5+esm2",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.3-2ubuntu2.5+esm3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.9.6-2ubuntu0.22.04.7",
"evidence": "/affected/3/ranges"
}
],
"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",
"evidence": "/affected/3/versions"
},
{
"value": "0.9.6-2ubuntu0.22.04.6",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.10.6-2ubuntu0.4",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "0.10.5-3ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.5-3ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.6-2",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.6-2build1",
"evidence": "/affected/4/versions"
},
{
"value": "0.10.6-2build2",
"evidence": "/affected/4/versions"
},
{
"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",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.11.2-1ubuntu0.3",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "0.11.1-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.11.1-2",
"evidence": "/affected/5/versions"
},
{
"value": "0.11.2-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.11.2-1build1",
"evidence": "/affected/5/versions"
},
{
"value": "0.11.2-1ubuntu0.1",
"evidence": "/affected/5/versions"
},
{
"value": "0.11.2-1ubuntu0.2",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libssh",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.11.3-1ubuntu2",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "0.11.2-1build1",
"evidence": "/affected/6/versions"
},
{
"value": "0.11.3-1",
"evidence": "/affected/6/versions"
},
{
"value": "0.11.3-1ubuntu1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-3731",
"aliases": [
"UBUNTU-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: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"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.6.3-4.3ubuntu0.6+esm5"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"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",
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssh-4",
"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"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssh-4",
"binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm7"
},
{
"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": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.9.3-2ubuntu2.5+esm4"
}
]
}
],
"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/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"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/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"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",
"ecosystem": "Ubuntu:24.04:LTS"
},
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"ecosystem_specific": {
"binaries": [
{
"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",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssh-4",
"binary_version": "0.11.2-1ubuntu0.3"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.11.3-1ubuntu2"
}
]
}
],
"package": {
"name": "libssh",
"purl": "pkg:deb/ubuntu/libssh?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.11.2-1build1",
"0.11.3-1",
"0.11.3-1ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-3731.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libssh-4",
"binary_version": "0.11.3-1ubuntu2"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-27T04:17:55.281393002Z",
"provider": "osv",
"upstream": [
"CVE-2026-3731"
],
"references": [
"https://ubuntu.com/security/CVE-2026-3731",
"https://www.cve.org/CVERecord?id=CVE-2026-3731",
"https://ubuntu.com/security/notices/USN-8093-1",
"https://ubuntu.com/security/notices/USN-8093-2"
]
},
"related_cves": [
{
"value": "CVE-2026-3731",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 460325,
"published_at": "2026-03-08T11:15:00+00:00"
}