CriticalFix available

DEBIAN-CVE-2026-12087

Type: advisorySource: OSV1 source record

Socket versions before 2.041 for Perl have an out-of-bounds heap read. In Socket.xs, pack_ip_mreq_source() checks the length of its source argument before the argument is read, so the check tests the byte length carried over from the preceding multiaddr argument instead. Both addresses occupy a 4-byte field, so a valid multiaddr lets a source of any length pass the check, and the source is then copied into the 4-byte imr_sourceaddr field with a fixed-size copy. A source shorter than 4 bytes is not rejected, and the copy reads up to 3 bytes past the end of its buffer. Calling pack_ip_mreq_source() with a source value shorter than 4 bytes copies adjacent heap memory into the returned packed structure.

Announced 15 Jun 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-12087

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-2026-12087

libsocket-perl

Source reference: /affected/0/package/name

Affected versions: 2.036-1
Source reference: /affected/0/versions
2.037-1
Source reference: /affected/0/versions
2.038-1
Source reference: /affected/0/versions
2.040-1
Source reference: /affected/0/versions
2.041-1
Source reference: /affected/0/versions
2.043-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

libsocket-perl

Source reference: /affected/1/package/name

Affected versions: 2.038-1
Source reference: /affected/1/versions
Fixed versions: 2.038-1+deb13u1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

libsocket-perl

Source reference: /affected/2/package/name

Affected versions: 2.038-1
Source reference: /affected/2/versions
2.040-1
Source reference: /affected/2/versions
Fixed versions: 2.041-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

perl

Source reference: /affected/3/package/name

Affected versions: 5.36.0-7
Source reference: /affected/3/versions
5.36.0-7+deb12u1
Source reference: /affected/3/versions
5.36.0-7+deb12u2
Source reference: /affected/3/versions
5.36.0-7+deb12u3
Source reference: /affected/3/versions
Fixed versions: 5.36.0-7+deb12u4
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

perl

Source reference: /affected/4/package/name

Affected versions: 5.40.1-6
Source reference: /affected/4/versions
Fixed versions: 5.40.1-6+deb13u1
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

perl

Source reference: /affected/5/package/name

Affected versions: 5.40.1-6
Source reference: /affected/5/versions
5.40.1-7
Source reference: /affected/5/versions
5.40.1-8
Source reference: /affected/5/versions
5.42.0-1
Source reference: /affected/5/versions
5.42.0-2
Source reference: /affected/5/versions
5.42.0-3
Source reference: /affected/5/versions
5.42.2-1
Source reference: /affected/5/versions
5.42.2-2
Source reference: /affected/5/versions
5.42.2-3
Source reference: /affected/5/versions
Fixed versions: 5.42.3-1
Source reference: /affected/5/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"
          }
        ]
      }
    ],
    "package": {
      "name": "libsocket-perl",
      "purl": "pkg:deb/debian/libsocket-perl?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.036-1",
      "2.037-1",
      "2.038-1",
      "2.040-1",
      "2.041-1",
      "2.043-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12087.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.038-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "libsocket-perl",
      "purl": "pkg:deb/debian/libsocket-perl?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.038-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12087.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.041-1"
          }
        ]
      }
    ],
    "package": {
      "name": "libsocket-perl",
      "purl": "pkg:deb/debian/libsocket-perl?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.038-1",
      "2.040-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12087.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "5.36.0-7+deb12u4"
          }
        ]
      }
    ],
    "package": {
      "name": "perl",
      "purl": "pkg:deb/debian/perl?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "5.36.0-7",
      "5.36.0-7+deb12u1",
      "5.36.0-7+deb12u2",
      "5.36.0-7+deb12u3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12087.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "5.40.1-6+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "perl",
      "purl": "pkg:deb/debian/perl?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "5.40.1-6"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12087.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "5.42.3-1"
          }
        ]
      }
    ],
    "package": {
      "name": "perl",
      "purl": "pkg:deb/debian/perl?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "5.40.1-6",
      "5.40.1-7",
      "5.40.1-8",
      "5.42.0-1",
      "5.42.0-2",
      "5.42.0-3",
      "5.42.2-1",
      "5.42.2-2",
      "5.42.2-3"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-12087.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Related CVEs: CVE-2026-12087
Source reference: /upstream

Publisher severity

critical

Source reference: /severity/0/score

Event: #83714 · Revision 1
Added to Heist Feed: Mon, 26 Oct 2026 21:37:33 GMT
Publisher date: Mon, 15 Jun 2026 22:16:16 GMT

Read the original announcement

Revision history

26 Oct 2026DEBIAN-CVE-2026-12087 · Revision 1Source updated