UnratedFix available

libgit2 vulnerability

Type: advisorySource: OSV1 source record

Kazuma Matsumoto and Isabel Mill discovered that libgit2 incorrectly handled certain repository URLs when using the SSH transport. A remote attacker could possibly use this issue to execute arbitrary commands.

Announced 23 Sept 2026Group revision 1

Original source ↗

USN-8809-1

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-8809-1

libgit2

Source reference: /affected/0/package/name

Affected versions: 0.22.2-2
Source reference: /affected/0/versions
0.23.1-1
Source reference: /affected/0/versions
0.24.1-2
Source reference: /affected/0/versions
0.24.1-2ubuntu0.2
Source reference: /affected/0/versions
0.24.1-2ubuntu0.2+esm1
Source reference: /affected/0/versions
0.24.1-2ubuntu0.2+esm2
Source reference: /affected/0/versions
0.24.1-2ubuntu0.2+esm3
Source reference: /affected/0/versions
Fixed versions: 0.24.1-2ubuntu0.2+esm4
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

libgit2

Source reference: /affected/1/package/name

Affected versions: 0.25.1+really0.24.6-1
Source reference: /affected/1/versions
0.26.0+dfsg.1-1.1
Source reference: /affected/1/versions
0.26.0+dfsg.1-1.1build1
Source reference: /affected/1/versions
0.26.0+dfsg.1-1.1ubuntu0.2
Source reference: /affected/1/versions
0.26.0+dfsg.1-1.1ubuntu0.2+esm1
Source reference: /affected/1/versions
0.26.0+dfsg.1-1.1ubuntu0.2+esm2
Source reference: /affected/1/versions
Fixed versions: 0.26.0+dfsg.1-1.1ubuntu0.2+esm3
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

libgit2

Source reference: /affected/2/package/name

Affected versions: 0.27.7+dfsg.1-0.2build1
Source reference: /affected/2/versions
0.28.3+dfsg.1-1
Source reference: /affected/2/versions
0.28.3+dfsg.1-1ubuntu1
Source reference: /affected/2/versions
0.28.4+dfsg.1-2
Source reference: /affected/2/versions
0.28.4+dfsg.1-2ubuntu0.1
Source reference: /affected/2/versions
0.28.4+dfsg.1-2ubuntu0.1+esm1
Source reference: /affected/2/versions
Fixed versions: 0.28.4+dfsg.1-2ubuntu0.1+esm2
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

libgit2

Source reference: /affected/3/package/name

Affected versions: 1.1.0+dfsg.1-4
Source reference: /affected/3/versions
1.1.0+dfsg.1-4.1
Source reference: /affected/3/versions
1.1.0+dfsg.1-4.1build1
Source reference: /affected/3/versions
1.1.0+dfsg.1-4.1ubuntu0.1
Source reference: /affected/3/versions
1.1.0+dfsg.1-4.1ubuntu0.1+esm1
Source reference: /affected/3/versions
Fixed versions: 1.1.0+dfsg.1-4.1ubuntu0.1+esm2
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

libgit2

Source reference: /affected/4/package/name

Affected versions: 1.5.1+ds-1ubuntu1
Source reference: /affected/4/versions
1.7.1+ds-2ubuntu1
Source reference: /affected/4/versions
1.7.2+ds-1ubuntu1
Source reference: /affected/4/versions
1.7.2+ds-1ubuntu2
Source reference: /affected/4/versions
1.7.2+ds-1ubuntu3
Source reference: /affected/4/versions
1.7.2+ds-1ubuntu3.1
Source reference: /affected/4/versions
Fixed versions: 1.7.2+ds-1ubuntu3.2
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

libgit2

Source reference: /affected/5/package/name

Affected versions: 1.9.0+ds-2ubuntu2
Source reference: /affected/5/versions
1.9.1+ds-1ubuntu1
Source reference: /affected/5/versions
1.9.1+ds-1ubuntu1.1
Source reference: /affected/5/versions
Fixed versions: 1.9.1+ds-1ubuntu1.2
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

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    "ranges": [
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          {
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            "fixed": "0.24.1-2ubuntu0.2+esm4"
          }
        ]
      }
    ],
    "package": {
      "name": "libgit2",
      "purl": "pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps-legacy%2Fxenial",
      "ecosystem": "Ubuntu:Pro:16.04:LTS"
    },
    "versions": [
      "0.22.2-2",
      "0.23.1-1",
      "0.24.1-2",
      "0.24.1-2ubuntu0.2",
      "0.24.1-2ubuntu0.2+esm1",
      "0.24.1-2ubuntu0.2+esm2",
      "0.24.1-2ubuntu0.2+esm3"
    ],
    "database_specific": {
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                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
              },
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            ]
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        ],
        "ecosystem": "Ubuntu:Pro:16.04:LTS"
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    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libgit2-24",
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          }
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      }
    ],
    "package": {
      "name": "libgit2",
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      "0.25.1+really0.24.6-1",
      "0.26.0+dfsg.1-1.1",
      "0.26.0+dfsg.1-1.1build1",
      "0.26.0+dfsg.1-1.1ubuntu0.2",
      "0.26.0+dfsg.1-1.1ubuntu0.2+esm1",
      "0.26.0+dfsg.1-1.1ubuntu0.2+esm2"
    ],
    "database_specific": {
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      "cves_map": {
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            "id": "CVE-2026-5917",
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              },
              {
                "type": "CVSS_V4",
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              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:18.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libgit2-26",
          "binary_version": "0.26.0+dfsg.1-1.1ubuntu0.2+esm3"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.28.4+dfsg.1-2ubuntu0.1+esm2"
          }
        ]
      }
    ],
    "package": {
      "name": "libgit2",
      "purl": "pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "0.27.7+dfsg.1-0.2build1",
      "0.28.3+dfsg.1-1",
      "0.28.3+dfsg.1-1ubuntu1",
      "0.28.4+dfsg.1-2",
      "0.28.4+dfsg.1-2ubuntu0.1",
      "0.28.4+dfsg.1-2ubuntu0.1+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-5917",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:20.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libgit2-28",
          "binary_version": "0.28.4+dfsg.1-2ubuntu0.1+esm2"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.1.0+dfsg.1-4.1ubuntu0.1+esm2"
          }
        ]
      }
    ],
    "package": {
      "name": "libgit2",
      "purl": "pkg:deb/ubuntu/libgit2?arch=source&distro=esm-apps%2Fjammy",
      "ecosystem": "Ubuntu:Pro:22.04:LTS"
    },
    "versions": [
      "1.1.0+dfsg.1-4",
      "1.1.0+dfsg.1-4.1",
      "1.1.0+dfsg.1-4.1build1",
      "1.1.0+dfsg.1-4.1ubuntu0.1",
      "1.1.0+dfsg.1-4.1ubuntu0.1+esm1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-5917",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:Pro:22.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libgit2-1.1",
          "binary_version": "1.1.0+dfsg.1-4.1ubuntu0.1+esm2"
        },
        {
          "binary_name": "libgit2-fixtures",
          "binary_version": "1.1.0+dfsg.1-4.1ubuntu0.1+esm2"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.7.2+ds-1ubuntu3.2"
          }
        ]
      }
    ],
    "package": {
      "name": "libgit2",
      "purl": "pkg:deb/ubuntu/libgit2?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "1.5.1+ds-1ubuntu1",
      "1.7.1+ds-2ubuntu1",
      "1.7.2+ds-1ubuntu1",
      "1.7.2+ds-1ubuntu2",
      "1.7.2+ds-1ubuntu3",
      "1.7.2+ds-1ubuntu3.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-5917",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:24.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libgit2-1.7",
          "binary_version": "1.7.2+ds-1ubuntu3.2"
        },
        {
          "binary_name": "libgit2-fixtures",
          "binary_version": "1.7.2+ds-1ubuntu3.2"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.9.1+ds-1ubuntu1.2"
          }
        ]
      }
    ],
    "package": {
      "name": "libgit2",
      "purl": "pkg:deb/ubuntu/libgit2?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "1.9.0+ds-2ubuntu2",
      "1.9.1+ds-1ubuntu1",
      "1.9.1+ds-1ubuntu1.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8809-1.json",
      "cves_map": {
        "cves": [
          {
            "id": "CVE-2026-5917",
            "severity": [
              {
                "type": "CVSS_V3",
                "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
              },
              {
                "type": "CVSS_V4",
                "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
              },
              {
                "type": "Ubuntu",
                "score": "medium"
              }
            ]
          }
        ],
        "ecosystem": "Ubuntu:26.04:LTS"
      }
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libgit2-1.9",
          "binary_version": "1.9.1+ds-1ubuntu1.2"
        },
        {
          "binary_name": "libgit2-fixtures",
          "binary_version": "1.9.1+ds-1ubuntu1.2"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #6069 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 22:21:36 GMT
Publisher date: Wed, 23 Sep 2026 18:29:41 GMT

Read the original announcement

Revision history

24 Oct 2026USN-8809-1 · Revision 1Source updated