UnratedFix available

DEBIAN-CVE-2026-40194

Type: advisorySource: OSV1 source record

phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.

Announced 10 Apr 2026Source revision 1

Original source ↗

DEBIAN-CVE-2026-40194

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-2026-40194

php-phpseclib

Source reference: /affected/0/package/name

Affected versions: 2.0.42-1
Source reference: /affected/0/versions
2.0.42-1+deb12u1
Source reference: /affected/0/versions
2.0.42-1+deb12u2
Source reference: /affected/0/versions
2.0.42-1+deb12u3
Source reference: /affected/0/versions
Fixed versions: 2.0.42-1+deb12u4
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

php-phpseclib

Source reference: /affected/1/package/name

Affected versions: 2.0.48-3
Source reference: /affected/1/versions
2.0.48-3+deb13u1
Source reference: /affected/1/versions
Fixed versions: 2.0.48-3+deb13u2
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

php-phpseclib

Source reference: /affected/2/package/name

Affected versions: 2.0.48-3
Source reference: /affected/2/versions
2.0.49-1
Source reference: /affected/2/versions
2.0.50-1
Source reference: /affected/2/versions
2.0.51-1
Source reference: /affected/2/versions
2.0.52-1
Source reference: /affected/2/versions
Fixed versions: 2.0.53-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

php-phpseclib3

Source reference: /affected/3/package/name

Affected versions: 3.0.19-1
Source reference: /affected/3/versions
3.0.19-1+deb12u1
Source reference: /affected/3/versions
3.0.19-1+deb12u2
Source reference: /affected/3/versions
3.0.19-1+deb12u3
Source reference: /affected/3/versions
3.0.19-1+deb12u4
Source reference: /affected/3/versions
Fixed versions: 3.0.19-1+deb12u5
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

php-phpseclib3

Source reference: /affected/4/package/name

Affected versions: 3.0.43-2
Source reference: /affected/4/versions
3.0.43-2+deb13u1
Source reference: /affected/4/versions
Fixed versions: 3.0.43-2+deb13u2
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

php-phpseclib3

Source reference: /affected/5/package/name

Affected versions: 3.0.43-2
Source reference: /affected/5/versions
3.0.44-1
Source reference: /affected/5/versions
3.0.44-2
Source reference: /affected/5/versions
3.0.45-1
Source reference: /affected/5/versions
3.0.46-1
Source reference: /affected/5/versions
3.0.46-2
Source reference: /affected/5/versions
3.0.47-1
Source reference: /affected/5/versions
3.0.48-1
Source reference: /affected/5/versions
3.0.49-1
Source reference: /affected/5/versions
3.0.50-1
Source reference: /affected/5/versions
Fixed versions: 3.0.51-1
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

phpseclib

Source reference: /affected/6/package/name

Affected versions: 1.0.20-1
Source reference: /affected/6/versions
1.0.20-1+deb12u1
Source reference: /affected/6/versions
1.0.20-1+deb12u2
Source reference: /affected/6/versions
1.0.20-1+deb12u3
Source reference: /affected/6/versions
Fixed versions: 1.0.20-1+deb12u4
Source reference: /affected/6/ranges
Prerequisites: Not stated in this record

phpseclib

Source reference: /affected/7/package/name

Affected versions: 1.0.23-6
Source reference: /affected/7/versions
1.0.23-6+deb13u1
Source reference: /affected/7/versions
Fixed versions: 1.0.23-6+deb13u2
Source reference: /affected/7/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": "2.0.42-1+deb12u4"
          }
        ]
      }
    ],
    "package": {
      "name": "php-phpseclib",
      "purl": "pkg:deb/debian/php-phpseclib?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.0.42-1",
      "2.0.42-1+deb12u1",
      "2.0.42-1+deb12u2",
      "2.0.42-1+deb12u3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.0.48-3+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "php-phpseclib",
      "purl": "pkg:deb/debian/php-phpseclib?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.0.48-3",
      "2.0.48-3+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.0.53-1"
          }
        ]
      }
    ],
    "package": {
      "name": "php-phpseclib",
      "purl": "pkg:deb/debian/php-phpseclib?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.0.48-3",
      "2.0.49-1",
      "2.0.50-1",
      "2.0.51-1",
      "2.0.52-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.19-1+deb12u5"
          }
        ]
      }
    ],
    "package": {
      "name": "php-phpseclib3",
      "purl": "pkg:deb/debian/php-phpseclib3?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.0.19-1",
      "3.0.19-1+deb12u1",
      "3.0.19-1+deb12u2",
      "3.0.19-1+deb12u3",
      "3.0.19-1+deb12u4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.43-2+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "php-phpseclib3",
      "purl": "pkg:deb/debian/php-phpseclib3?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.0.43-2",
      "3.0.43-2+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.0.51-1"
          }
        ]
      }
    ],
    "package": {
      "name": "php-phpseclib3",
      "purl": "pkg:deb/debian/php-phpseclib3?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.0.43-2",
      "3.0.44-1",
      "3.0.44-2",
      "3.0.45-1",
      "3.0.46-1",
      "3.0.46-2",
      "3.0.47-1",
      "3.0.48-1",
      "3.0.49-1",
      "3.0.50-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.0.20-1+deb12u4"
          }
        ]
      }
    ],
    "package": {
      "name": "phpseclib",
      "purl": "pkg:deb/debian/phpseclib?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.0.20-1",
      "1.0.20-1+deb12u1",
      "1.0.20-1+deb12u2",
      "1.0.20-1+deb12u3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.0.23-6+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "phpseclib",
      "purl": "pkg:deb/debian/phpseclib?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.0.23-6",
      "1.0.23-6+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40194.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #57007 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 16:57:21 GMT
Publisher date: Fri, 10 Apr 2026 21:16:27 GMT

Read the original announcement