USN-8907-1

It was discovered that libgit2 incorrectly handled IP address SubjectAltName verification in TLS certificate validation. A remote attacker with a CA-trusted certificate could possibly use this issue to perform a machine-in-the-middle attack, leading to the exposure of sensitive information.

References

Affected packages

Ubuntu:24.04:LTS / libgit2

Package

Name: libgit2
Purl: pkg:deb/ubuntu/libgit2?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.7.2+ds-1ubuntu3.3

Affected versions

1.*

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

1.7.2+ds-1ubuntu3.2

Ecosystem specific

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libgit2-1.7",
            "binary_version":  "1.7.2+ds-1ubuntu3.3"
        },
        {
            "binary_name":  "libgit2-fixtures",
            "binary_version":  "1.7.2+ds-1ubuntu3.3"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2026-53583",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:24.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8907-1.json"

Ubuntu:26.04:LTS / libgit2

Package

Name: libgit2
Purl: pkg:deb/ubuntu/libgit2?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.9.1+ds-1ubuntu1.3

Affected versions

1.*

1.9.0+ds-2ubuntu2

1.9.1+ds-1ubuntu1

1.9.1+ds-1ubuntu1.1

1.9.1+ds-1ubuntu1.2

Ecosystem specific

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "libgit2-1.9",
            "binary_version":  "1.9.1+ds-1ubuntu1.3"
        },
        {
            "binary_name":  "libgit2-fixtures",
            "binary_version":  "1.9.1+ds-1ubuntu1.3"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2026-53583",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8907-1.json"