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DEBIAN-CVE-2026-58051

Type: advisorySource: OSV1 source record

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-58051

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:DEBIAN-CVE-2026-58051

libssh2

Source reference: /affected/0/package/name

Affected versions
1.10.0-3

Source reference: /affected/0/versions

Fixed versions
1.10.0-3+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

libssh2

Source reference: /affected/1/package/name

Affected versions
1.11.1-1

Source reference: /affected/1/versions

1.11.1-1+deb13u1

Source reference: /affected/1/versions

Fixed versions
1.11.1-1+deb13u2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

libssh2

Source reference: /affected/2/package/name

Affected versions
1.11.1-1

Source reference: /affected/2/versions

1.11.1-2

Source reference: /affected/2/versions

1.11.1-3

Source reference: /affected/2/versions

1.11.1-4

Source reference: /affected/2/versions

1.11.1-5

Source reference: /affected/2/versions

Fixed versions
1.11.1-6

Source reference: /affected/2/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": "1.10.0-3+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "libssh2",
      "purl": "pkg:deb/debian/libssh2?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.10.0-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58051.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.11.1-1+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "libssh2",
      "purl": "pkg:deb/debian/libssh2?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.11.1-1",
      "1.11.1-1+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58051.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.11.1-6"
          }
        ]
      }
    ],
    "package": {
      "name": "libssh2",
      "purl": "pkg:deb/debian/libssh2?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.11.1-1",
      "1.11.1-2",
      "1.11.1-3",
      "1.11.1-4",
      "1.11.1-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58051.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57974 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-58051 · Revision 1Source updated