HighFix available
open-iscsi, open-isns — security advisory
A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.
- Products
- open-iscsi, open-isns
- Affected versions
- 0.100-3ubuntu3, 0.100-3ubuntu4, 0.100-3ubuntu5, 0.101-0.2, 0.101-0.3, 0.101-0.3build1, 0.101-0.3build2, 0.101-0.3build3, 0.101-0ubuntu1, 0.101-0ubuntu2, 0.101-1, 0.101-1build1, 0.101-2, 0.101-2.1, 0.97-2, 0.97-2build1, 0.97-3, 2.0.873+git0.3b4b4500-13ubuntu3, 2.0.873+git0.3b4b4500-14ubuntu1, 2.0.873+git0.3b4b4500-14ubuntu3, 2.0.873+git0.3b4b4500-14ubuntu3.1, 2.0.873+git0.3b4b4500-14ubuntu3.2, 2.0.873+git0.3b4b4500-14ubuntu3.3, 2.0.873+git0.3b4b4500-14ubuntu3.4, 2.0.873+git0.3b4b4500-14ubuntu3.5, 2.0.873+git0.3b4b4500-14ubuntu3.6, 2.0.873+git0.3b4b4500-14ubuntu3.7, 2.0.873+git0.3b4b4500-14ubuntu3.7+esm1, 2.0.873-3ubuntu13, 2.0.873-3ubuntu7, 2.0.873-3ubuntu8, 2.0.873-3ubuntu9, 2.0.874-4ubuntu3, 2.0.874-4ubuntu4, 2.0.874-4ubuntu5, 2.0.874-5ubuntu1, 2.0.874-5ubuntu2, 2.0.874-5ubuntu2.1, 2.0.874-5ubuntu2.10, 2.0.874-5ubuntu2.11, 2.0.874-5ubuntu2.11+esm1, 2.0.874-5ubuntu2.2, 2.0.874-5ubuntu2.3, 2.0.874-5ubuntu2.4, 2.0.874-5ubuntu2.6, 2.0.874-5ubuntu2.7, 2.0.874-5ubuntu2.9, 2.0.874-7.1ubuntu3, 2.0.874-7.1ubuntu5, 2.0.874-7.1ubuntu6, 2.0.874-7.1ubuntu6.1, 2.0.874-7.1ubuntu6.2, 2.0.874-7.1ubuntu6.3, 2.0.874-7.1ubuntu6.4, 2.0.874-7.1ubuntu6.5, 2.1.11-1ubuntu3, 2.1.11-3ubuntu1, 2.1.11-3ubuntu2, 2.1.11-3ubuntu3, 2.1.11-3ubuntu3.1, 2.1.11-5ubuntu1, 2.1.11-5ubuntu4, 2.1.11-5ubuntu5, 2.1.11-5ubuntu6, 2.1.4-0ubuntu1, 2.1.4-0ubuntu2, 2.1.4-0ubuntu3, 2.1.4-0ubuntu4, 2.1.5-1ubuntu1, 2.1.5-1ubuntu1.1, 2.1.5-1ubuntu1.3, 2.1.8-1ubuntu2, 2.1.9-3ubuntu1, 2.1.9-3ubuntu2, 2.1.9-3ubuntu3, 2.1.9-3ubuntu4, 2.1.9-3ubuntu5.1, 2.1.9-3ubuntu5.2, 2.1.9-3ubuntu5.3, 2.1.9-3ubuntu5.4, 2.1.9-3ubuntu5.5
- Fixed versions
- 0.101-0.3ubuntu0.1, 0.101-0ubuntu2.1, 0.101-2.1ubuntu0.1, 0.97-2ubuntu0.1~esm1, 0.97-3ubuntu0.1~esm1
- CVEs
- CVE-2026-55995
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:47 UTC · Revision 1
Source evidence
A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.
osv:UBUNTU-CVE-2026-55995
open-iscsi
Fixed versions: Not specified
open-iscsi
Fixed versions: Not specified
open-iscsi
Fixed versions: Not specified
open-isns
Fixed versions: 0.97-2ubuntu0.1~esm1
open-iscsi
Fixed versions: Not specified
open-isns
Fixed versions: 0.97-3ubuntu0.1~esm1
open-iscsi
Fixed versions: Not specified
open-isns
Fixed versions: 0.101-0ubuntu2.1
open-iscsi
Fixed versions: Not specified
open-isns
Fixed versions: 0.101-0.3ubuntu0.1
open-iscsi
Fixed versions: Not specified
open-iscsi
Fixed versions: Not specified
open-isns
Fixed versions: 0.101-2.1ubuntu0.1
Complete source record
{
"id": "497a22de3cdca5156bf17f7d931d81120cae1ec415c319fa47b64ac6511c416e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-55995",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-55995",
"summary": "A Double Free vulnerability in open-iscsi allows an unauthenticated MITM attacker to cause DoS. This issue affects open-iscsi: from ? through 56718d4e9d1a4f51c30697b5c0534144bb41c9bb.",
"evidence": "osv:UBUNTU-CVE-2026-55995",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "2.0.873-3ubuntu7",
"evidence": "/affected/0/versions"
},
{
"value": "2.0.873-3ubuntu8",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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]
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{
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{
"value": "2.0.873-3ubuntu13",
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},
{
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"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3.1",
"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3.2",
"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3.3",
"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3.4",
"evidence": "/affected/1/versions"
},
{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3.7",
"evidence": "/affected/1/versions"
},
{
"value": "2.0.873+git0.3b4b4500-14ubuntu3.7+esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "open-iscsi",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.874-4ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-4ubuntu4",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-4ubuntu5",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.1",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.2",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.3",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.4",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.6",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.7",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.9",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.10",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.11",
"evidence": "/affected/2/versions"
},
{
"value": "2.0.874-5ubuntu2.11+esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "open-isns",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.97-2ubuntu0.1~esm1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": [
{
"value": "0.97-2",
"evidence": "/affected/3/versions"
},
{
"value": "0.97-2build1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "open-iscsi",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.0.874-7.1ubuntu3",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu5",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu6",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu6.1",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu6.2",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu6.3",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu6.4",
"evidence": "/affected/4/versions"
},
{
"value": "2.0.874-7.1ubuntu6.5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "open-isns",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.97-3ubuntu0.1~esm1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "0.97-3",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "open-iscsi",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.1.4-0ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.1.4-0ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "2.1.4-0ubuntu3",
"evidence": "/affected/6/versions"
},
{
"value": "2.1.4-0ubuntu4",
"evidence": "/affected/6/versions"
},
{
"value": "2.1.5-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "2.1.5-1ubuntu1.1",
"evidence": "/affected/6/versions"
},
{
"value": "2.1.5-1ubuntu1.3",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "open-isns",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.101-0ubuntu2.1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": [
{
"value": "0.100-3ubuntu3",
"evidence": "/affected/7/versions"
},
{
"value": "0.100-3ubuntu4",
"evidence": "/affected/7/versions"
},
{
"value": "0.100-3ubuntu5",
"evidence": "/affected/7/versions"
},
{
"value": "0.101-0ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "0.101-0ubuntu2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "open-iscsi",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.1.8-1ubuntu2",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu1",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu2",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu3",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu4",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu5.1",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu5.2",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu5.3",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu5.4",
"evidence": "/affected/8/versions"
},
{
"value": "2.1.9-3ubuntu5.5",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "open-isns",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.101-0.3ubuntu0.1",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": [
{
"value": "0.101-0.2",
"evidence": "/affected/9/versions"
},
{
"value": "0.101-0.3",
"evidence": "/affected/9/versions"
},
{
"value": "0.101-0.3build1",
"evidence": "/affected/9/versions"
},
{
"value": "0.101-0.3build2",
"evidence": "/affected/9/versions"
},
{
"value": "0.101-0.3build3",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "open-iscsi",
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},
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"affected_versions": [
{
"value": "2.1.11-3ubuntu3",
"evidence": "/affected/10/versions"
},
{
"value": "2.1.11-5ubuntu1",
"evidence": "/affected/10/versions"
},
{
"value": "2.1.11-5ubuntu4",
"evidence": "/affected/10/versions"
},
{
"value": "2.1.11-5ubuntu5",
"evidence": "/affected/10/versions"
},
{
"value": "2.1.11-5ubuntu6",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "open-iscsi",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2.1.11-1ubuntu3",
"evidence": "/affected/11/versions"
},
{
"value": "2.1.11-3ubuntu1",
"evidence": "/affected/11/versions"
},
{
"value": "2.1.11-3ubuntu2",
"evidence": "/affected/11/versions"
},
{
"value": "2.1.11-3ubuntu3",
"evidence": "/affected/11/versions"
},
{
"value": "2.1.11-3ubuntu3.1",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "open-isns",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.101-2.1ubuntu0.1",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": [
{
"value": "0.101-1",
"evidence": "/affected/12/versions"
},
{
"value": "0.101-1build1",
"evidence": "/affected/12/versions"
},
{
"value": "0.101-2",
"evidence": "/affected/12/versions"
},
{
"value": "0.101-2.1",
"evidence": "/affected/12/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-55995",
"aliases": [
"UBUNTU-CVE-2026-55995"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "open-iscsi",
"purl": "pkg:deb/ubuntu/open-iscsi?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
"2.0.873-3ubuntu7",
"2.0.873-3ubuntu8",
"2.0.873-3ubuntu9"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55995.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "open-iscsi",
"binary_version": "2.0.873-3ubuntu9"
},
{
"binary_name": "open-iscsi-utils",
"binary_version": "2.0.873-3ubuntu9"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "open-iscsi",
"purl": "pkg:deb/ubuntu/open-iscsi?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"2.0.873-3ubuntu13",
"2.0.873+git0.3b4b4500-13ubuntu3",
"2.0.873+git0.3b4b4500-14ubuntu1",
"2.0.873+git0.3b4b4500-14ubuntu3",
"2.0.873+git0.3b4b4500-14ubuntu3.1",
"2.0.873+git0.3b4b4500-14ubuntu3.2",
"2.0.873+git0.3b4b4500-14ubuntu3.3",
"2.0.873+git0.3b4b4500-14ubuntu3.4",
"2.0.873+git0.3b4b4500-14ubuntu3.5",
"2.0.873+git0.3b4b4500-14ubuntu3.6",
"2.0.873+git0.3b4b4500-14ubuntu3.7",
"2.0.873+git0.3b4b4500-14ubuntu3.7+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55995.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "open-iscsi",
"binary_version": "2.0.873+git0.3b4b4500-14ubuntu3.7+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "open-iscsi",
"purl": "pkg:deb/ubuntu/open-iscsi?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"2.0.874-4ubuntu3",
"2.0.874-4ubuntu4",
"2.0.874-4ubuntu5",
"2.0.874-5ubuntu1",
"2.0.874-5ubuntu2",
"2.0.874-5ubuntu2.1",
"2.0.874-5ubuntu2.2",
"2.0.874-5ubuntu2.3",
"2.0.874-5ubuntu2.4",
"2.0.874-5ubuntu2.6",
"2.0.874-5ubuntu2.7",
"2.0.874-5ubuntu2.9",
"2.0.874-5ubuntu2.10",
"2.0.874-5ubuntu2.11",
"2.0.874-5ubuntu2.11+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55995.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iscsiuio",
"binary_version": "2.0.874-5ubuntu2.11+esm1"
},
{
"binary_name": "open-iscsi",
"binary_version": "2.0.874-5ubuntu2.11+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.97-2ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "open-isns",
"purl": "pkg:deb/ubuntu/open-isns?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"0.97-2",
"0.97-2build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55995.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libisns0",
"binary_version": "0.97-2ubuntu0.1~esm1"
},
{
"binary_name": "open-isns-discoveryd",
"binary_version": "0.97-2ubuntu0.1~esm1"
},
{
"binary_name": "open-isns-server",
"binary_version": "0.97-2ubuntu0.1~esm1"
},
{
"binary_name": "open-isns-utils",
"binary_version": "0.97-2ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "open-iscsi",
"purl": "pkg:deb/ubuntu/open-iscsi?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"2.0.874-7.1ubuntu3",
"2.0.874-7.1ubuntu5",
"2.0.874-7.1ubuntu6",
"2.0.874-7.1ubuntu6.1",
"2.0.874-7.1ubuntu6.2",
"2.0.874-7.1ubuntu6.3",
"2.0.874-7.1ubuntu6.4",
"2.0.874-7.1ubuntu6.5"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55995.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iscsiuio",
"binary_version": "2.0.874-7.1ubuntu6.5"
},
{
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],
"modified": "2026-10-17T12:59:10.430914092Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-55995",
"https://www.cve.org/CVERecord?id=CVE-2026-55995",
"https://ubuntu.com/security/notices/USN-8807-1"
]
},
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{
"value": "CVE-2026-55995",
"evidence": "/upstream"
}
],
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"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359375,
"published_at": "2026-07-29T14:16:00+00:00"
}