UnratedFix available

Open-iSNS vulnerability

Type: advisorySource: OSV1 source record

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.

Announced 23 Sept 2026Source revision 1

Original source ↗

USN-8807-1

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:USN-8807-1

open-isns

Source reference: /affected/0/package/name

Affected versions: 0.97-2
Source reference: /affected/0/versions
0.97-2build1
Source reference: /affected/0/versions
Fixed versions: 0.97-2ubuntu0.1~esm1
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

open-isns

Source reference: /affected/1/package/name

Affected versions: 0.97-3
Source reference: /affected/1/versions
Fixed versions: 0.97-3ubuntu0.1~esm1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

open-isns

Source reference: /affected/2/package/name

Affected versions: 0.100-3ubuntu3
Source reference: /affected/2/versions
0.100-3ubuntu4
Source reference: /affected/2/versions
0.100-3ubuntu5
Source reference: /affected/2/versions
0.101-0ubuntu1
Source reference: /affected/2/versions
0.101-0ubuntu2
Source reference: /affected/2/versions
Fixed versions: 0.101-0ubuntu2.1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

open-isns

Source reference: /affected/3/package/name

Affected versions: 0.101-0.2
Source reference: /affected/3/versions
0.101-0.3
Source reference: /affected/3/versions
0.101-0.3build1
Source reference: /affected/3/versions
0.101-0.3build2
Source reference: /affected/3/versions
0.101-0.3build3
Source reference: /affected/3/versions
Fixed versions: 0.101-0.3ubuntu0.1
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

open-isns

Source reference: /affected/4/package/name

Affected versions: 0.101-1
Source reference: /affected/4/versions
0.101-1build1
Source reference: /affected/4/versions
0.101-2
Source reference: /affected/4/versions
0.101-2.1
Source reference: /affected/4/versions
Fixed versions: 0.101-2.1ubuntu0.1
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "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/usn/USN-8807-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-55995",
            "severity": [
              {
                "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"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:18.04:LTS"
      }
    },
    "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"
          },
          {
            "fixed": "0.97-3ubuntu0.1~esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "open-isns",
      "purl": "pkg:deb/ubuntu/open-isns?arch=source&distro=esm-infra%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "0.97-3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8807-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-55995",
            "severity": [
              {
                "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"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:20.04:LTS"
      }
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.101-0ubuntu2.1"
          }
        ]
      }
    ],
    "package": {
      "name": "open-isns",
      "purl": "pkg:deb/ubuntu/open-isns?arch=source&distro=jammy",
      "ecosystem": "Ubuntu:22.04:LTS"
    },
    "versions": [
      "0.100-3ubuntu3",
      "0.100-3ubuntu4",
      "0.100-3ubuntu5",
      "0.101-0ubuntu1",
      "0.101-0ubuntu2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8807-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-55995",
            "severity": [
              {
                "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"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:22.04:LTS"
      }
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.101-0.3ubuntu0.1"
          }
        ]
      }
    ],
    "package": {
      "name": "open-isns",
      "purl": "pkg:deb/ubuntu/open-isns?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "0.101-0.2",
      "0.101-0.3",
      "0.101-0.3build1",
      "0.101-0.3build2",
      "0.101-0.3build3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8807-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-55995",
            "severity": [
              {
                "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"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:24.04:LTS"
      }
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.101-2.1ubuntu0.1"
          }
        ]
      }
    ],
    "package": {
      "name": "open-isns",
      "purl": "pkg:deb/ubuntu/open-isns?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "0.101-1",
      "0.101-1build1",
      "0.101-2",
      "0.101-2.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8807-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-55995",
            "severity": [
              {
                "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"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:26.04:LTS"
      }
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #13775 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 00:30:00 GMT
Publisher date: Wed, 23 Sep 2026 17:07:59 GMT

Read the original announcement