ubuntu-cve-2025-48172
Vulnerability from osv_ubuntu
Published
2025-07-04 13:15
Modified
2026-05-20 15:22
Summary
Details

CHMLib through 2bef8d0, as used in SumatraPDF and other products, has a chm_lib.c _chm_decompress_block integer overflow. There is a resultant heap-based buffer overflow in _chm_fetch_bytes.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-3"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-4"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-4?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-3",
        "2:0.40a-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-5"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-5?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-7"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-7?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-8"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-8?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-8.1"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-8.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-8.1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-8.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libchm-bin",
            "binary_version": "2:0.40a-9"
          },
          {
            "binary_name": "libchm1",
            "binary_version": "2:0.40a-9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "chmlib",
        "purl": "pkg:deb/ubuntu/chmlib@2:0.40a-9?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:0.40a-8.1",
        "2:0.40a-9"
      ]
    }
  ],
  "aliases": [],
  "details": "CHMLib through 2bef8d0, as used in SumatraPDF and other products, has a chm_lib.c _chm_decompress_block integer overflow. There is a resultant heap-based buffer overflow in _chm_fetch_bytes.",
  "id": "UBUNTU-CVE-2025-48172",
  "modified": "2026-05-20T15:22:53Z",
  "published": "2025-07-04T13:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-48172"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-48172"
    },
    {
      "type": "REPORT",
      "url": "https://drive.google.com/file/d/1wq51px42eoJz2VQ1Qu9ObPVQVom9T9H_/view?usp=sharing"
    },
    {
      "type": "REPORT",
      "url": "https://drive.google.com/file/d/1XpulFyCGlq7Szzg5RsH-eRwZ6OyuSozl/view?usp=sharing"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jedwing/CHMLib/blob/2bef8d063ec7d88a8de6fd9f0513ea42ac0fa21f/src/chm_lib.c#L1386"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sumatrapdfreader/sumatrapdf/commit/08179946a745cf1605e4b9670942ec1a6e1f4c5d"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-48172"
  ]
}



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