ubuntu-cve-2026-12087
Vulnerability from osv_ubuntu
Published
2026-06-15 22:16
Modified
2026-07-01 11:41
Summary
Details

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.

Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
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          {
            "binary_name": "libcgi-fast-perl",
            "binary_version": "5.18.2-2ubuntu1.7+esm7"
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          },
          {
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          },
          {
            "binary_name": "perl-modules",
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          }
        ]
      },
      "package": {
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      },
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        }
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        "5.18.2-2ubuntu1.7+esm4",
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      "package": {
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      "package": {
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        "5.38.2-3.2ubuntu0.2",
        "5.38.2-3.2ubuntu0.3"
      ]
    },
    {
      "ecosystem_specific": {
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            "binary_name": "libsocket-perl",
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          }
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      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
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    },
    {
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          {
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        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libsocket-perl",
        "purl": "pkg:deb/ubuntu/libsocket-perl@2.040-1?arch=source\u0026distro=resolute"
      },
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        "2.040-1"
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    },
    {
      "ecosystem_specific": {
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          {
            "binary_name": "libperl5.40",
            "binary_version": "5.40.1-7ubuntu0.1"
          },
          {
            "binary_name": "perl",
            "binary_version": "5.40.1-7ubuntu0.1"
          },
          {
            "binary_name": "perl-base",
            "binary_version": "5.40.1-7ubuntu0.1"
          },
          {
            "binary_name": "perl-debug",
            "binary_version": "5.40.1-7ubuntu0.1"
          },
          {
            "binary_name": "perl-modules-5.40",
            "binary_version": "5.40.1-7ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "perl",
        "purl": "pkg:deb/ubuntu/perl@5.40.1-7ubuntu0.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
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            {
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "5.40.1-6build1",
        "5.40.1-7build1",
        "5.40.1-7ubuntu0.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-12087",
  "modified": "2026-07-01T11:41:12Z",
  "published": "2026-06-15T22:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-12087"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-12087"
    },
    {
      "type": "REPORT",
      "url": "https://lists.security.metacpan.org/cve-announce/msg/41020451/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-12087"
  ]
}



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