USN-8807-1 (UBUNTU-CVE-2026-55995)
Vulnerability from osv_ubuntu – Published: 2026-09-23 17:07 – Updated: 2026-09-23 17:07 – Source website
VLAI
Summary
Open-iSNS vulnerability
Details
It was discovered that Open-iSNS contained a double-free vulnerability when decoding malformed iSNS attributes. An unauthenticated attacker could possibly use this to cause a denial of service.
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "open-isns",
"purl": "pkg:deb/ubuntu/open-isns@0.97-2ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.97-2ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.97-2",
"0.97-2build1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libisns0",
"binary_version": "0.97-3ubuntu0.1~esm1"
},
{
"binary_name": "open-isns-discoveryd",
"binary_version": "0.97-3ubuntu0.1~esm1"
},
{
"binary_name": "open-isns-server",
"binary_version": "0.97-3ubuntu0.1~esm1"
},
{
"binary_name": "open-isns-utils",
"binary_version": "0.97-3ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "open-isns",
"purl": "pkg:deb/ubuntu/open-isns@0.97-3ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.97-3ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.97-3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libisns0",
"binary_version": "0.101-0ubuntu2.1"
},
{
"binary_name": "open-isns-discoveryd",
"binary_version": "0.101-0ubuntu2.1"
},
{
"binary_name": "open-isns-server",
"binary_version": "0.101-0ubuntu2.1"
},
{
"binary_name": "open-isns-utils",
"binary_version": "0.101-0ubuntu2.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "open-isns",
"purl": "pkg:deb/ubuntu/open-isns@0.101-0ubuntu2.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.101-0ubuntu2.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.100-3ubuntu3",
"0.100-3ubuntu4",
"0.100-3ubuntu5",
"0.101-0ubuntu1",
"0.101-0ubuntu2"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libisns0t64",
"binary_version": "0.101-0.3ubuntu0.1"
},
{
"binary_name": "open-isns-discoveryd",
"binary_version": "0.101-0.3ubuntu0.1"
},
{
"binary_name": "open-isns-server",
"binary_version": "0.101-0.3ubuntu0.1"
},
{
"binary_name": "open-isns-utils",
"binary_version": "0.101-0.3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "open-isns",
"purl": "pkg:deb/ubuntu/open-isns@0.101-0.3ubuntu0.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.101-0.3ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.101-0.2",
"0.101-0.3",
"0.101-0.3build1",
"0.101-0.3build2",
"0.101-0.3build3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libisns0t64",
"binary_version": "0.101-2.1ubuntu0.1"
},
{
"binary_name": "open-isns-discoveryd",
"binary_version": "0.101-2.1ubuntu0.1"
},
{
"binary_name": "open-isns-server",
"binary_version": "0.101-2.1ubuntu0.1"
},
{
"binary_name": "open-isns-utils",
"binary_version": "0.101-2.1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "open-isns",
"purl": "pkg:deb/ubuntu/open-isns@0.101-2.1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.101-2.1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.101-1",
"0.101-1build1",
"0.101-2",
"0.101-2.1"
]
}
],
"aliases": [],
"details": "It was discovered that Open-iSNS contained a double-free vulnerability when\ndecoding malformed iSNS attributes. An unauthenticated attacker could possibly\n use this to cause a denial of service.",
"id": "USN-8807-1",
"modified": "2026-09-23T17:07:59Z",
"published": "2026-09-23T17:07:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8807-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55995"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "Open-iSNS vulnerability",
"upstream": [
"UBUNTU-CVE-2026-55995"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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