CVE catalog

CVE-2026-7598

A security vulnerability has been detected in libssh2…

A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer overflow. The attack may be launched remotely. The name of the patch is 256d04b60d80bf1190e96b0ad1e91b2174d744b1. A patch should be applied to remediate this issue.

Severity: Critical · CVSS 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published: Apr 8, 2026, 10:22:24 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.47% · Oct 27, 2026

Projects and upstream resources

[libssh2][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "libssh2",
      "status": "fixed",
      "release": "sid",
      "version": "1.11.1-6"
    },
    {
      "name": "libssh2",
      "status": "fixed",
      "release": "forky",
      "version": "1.11.1-6"
    },
    {
      "name": "libssh2",
      "status": "fixed",
      "release": "trixie",
      "version": "1.11.1-1+deb13u2"
    },
    {
      "name": "libssh2",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1.11.1-1+deb13u1"
    },
    {
      "name": "libssh2",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.10.0-3"
    },
    {
      "name": "libssh2",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "1.10.0-3+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1135647,
      "name": "libssh2",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.11.1-3"
    },
    {
      "bug": 1135647,
      "name": "libssh2",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.11.1-3"
    },
    {
      "bug": 1135647,
      "name": "libssh2",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1.11.1-1+deb13u1"
    },
    {
      "bug": 1135647,
      "name": "libssh2",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1.10.0-3+deb12u1"
    }
  ],
  "distribution_packages": [
    {
      "name": "libssh2",
      "ecosystem": "cpe",
      "fixed_version": "1.11.0-4.1ubuntu0.24.04.1"
    },
    {
      "name": "libssh2-1-dev",
      "ecosystem": "cpe",
      "fixed_version": "1.11.0-4.1ubuntu0.24.04.1"
    },
    {
      "name": "libssh2-1t64",
      "ecosystem": "cpe",
      "fixed_version": "1.11.0-4.1ubuntu0.24.04.1"
    },
    {
      "name": "libssh2",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "libssh2",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "libssh2",
      "ranges": [
        {
          "fixed": "",
          "introduced": "",
          "last_affected": "1.11.1",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.0-r3"
            }
          ]
        }
      ],
      "release": "3.20",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "1.11.0-r3",
      "provider_record_id": "ALPINE-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-r1"
            }
          ]
        }
      ],
      "release": "3.21",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "1.11.1-r1",
      "provider_record_id": "ALPINE-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-r1"
            }
          ]
        }
      ],
      "release": "3.22",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "1.11.1-r1",
      "provider_record_id": "ALPINE-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-r2"
            }
          ]
        }
      ],
      "release": "3.23",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "1.11.1-r2",
      "provider_record_id": "ALPINE-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "alpine",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-r2"
            }
          ]
        }
      ],
      "release": "3.24",
      "versions": [],
      "ecosystem": "apk",
      "fixed_version": "1.11.1-r2",
      "provider_record_id": "ALPINE-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1.8.0-2.1build1",
        "1.8.0-2.1ubuntu0.1",
        "1.8.0-2.1ubuntu0.1+esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1.9.0-3",
        "1.10.0-2",
        "1.10.0-2build1",
        "1.10.0-3",
        "1.10.0-3ubuntu0.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.0-4.1ubuntu0.24.04.1"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "1.11.0-2",
        "1.11.0-3",
        "1.11.0-4",
        "1.11.0-4.1build1",
        "1.11.0-4.1build2"
      ],
      "ecosystem": "deb",
      "fixed_version": "1.11.0-4.1ubuntu0.24.04.1",
      "provider_record_id": "UBUNTU-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-1ubuntu0.25.10.1"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "1.11.1-1",
        "1.11.1-1build1"
      ],
      "ecosystem": "deb",
      "fixed_version": "1.11.1-1ubuntu0.25.10.1",
      "provider_record_id": "UBUNTU-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-1ubuntu0.26.04.1"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "1.11.1-1build1",
        "1.11.1-1build2"
      ],
      "ecosystem": "deb",
      "fixed_version": "1.11.1-1ubuntu0.26.04.1",
      "provider_record_id": "UBUNTU-CVE-2026-7598"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.0-4.1ubuntu0.24.04.1"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "1.11.0-2",
        "1.11.0-3",
        "1.11.0-4",
        "1.11.0-4.1build1",
        "1.11.0-4.1build2"
      ],
      "ecosystem": "deb",
      "fixed_version": "1.11.0-4.1ubuntu0.24.04.1",
      "provider_record_id": "USN-8309-1"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-1ubuntu0.25.10.1"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "1.11.1-1",
        "1.11.1-1build1"
      ],
      "ecosystem": "deb",
      "fixed_version": "1.11.1-1ubuntu0.25.10.1",
      "provider_record_id": "USN-8309-1"
    },
    {
      "name": "libssh2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.11.1-1ubuntu0.26.04.1"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "1.11.1-1build1",
        "1.11.1-1build2"
      ],
      "ecosystem": "deb",
      "fixed_version": "1.11.1-1ubuntu0.26.04.1",
      "provider_record_id": "USN-8309-1"
    }
  ]
}

[Debian bug #1135647]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libssh2-1]Unknown
Source package: [libssh2]
Details (2)
- 1.10.0-3+b1 · amd64 · bookworm
  Affected · Fixed: 1.10.0-3+deb12u1
  nvd · libssh2 · debian · bookworm; nvd · libssh2 · debian · 12
- 1.10.0-3+b1 · arm64 · bookworm
  Affected · Fixed: 1.10.0-3+deb12u1
  nvd · libssh2 · debian · bookworm; nvd · libssh2 · debian · 12
[libssh2-1-dev]Unknown
Source package: [libssh2]
Details (2)
- 1.10.0-3+b1 · amd64 · bookworm
  Affected · Fixed: 1.10.0-3+deb12u1
  nvd · libssh2 · debian · bookworm; nvd · libssh2 · debian · 12
- 1.10.0-3+b1 · arm64 · bookworm
  Affected · Fixed: 1.10.0-3+deb12u1
  nvd · libssh2 · debian · bookworm; nvd · libssh2 · debian · 12

[Debian 13 (Trixie)]

[libssh2-1-dev]Unknown
Source package: [libssh2]
Details (4)
- 1.11.1-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
- 1.11.1-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
- 1.11.1-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
- 1.11.1-1+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
[libssh2-1t64]Unknown
Source package: [libssh2]
Details (4)
- 1.11.1-1+deb13u1 · amd64 · trixie
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
- 1.11.1-1+deb13u1 · arm64 · trixie
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
- 1.11.1-1+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13
- 1.11.1-1+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1.11.1-1+deb13u1
  nvd · libssh2 · debian · 13

Observed: Oct 27, 2026, 7:59:37 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]