ubuntu-cve-2026-55195
Vulnerability from osv_ubuntu
Published
2026-07-08 21:16
Modified
2026-07-15 17:53
Summary
Details

py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.

Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-py7zr",
            "binary_version": "0.11.3+dfsg-4ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "py7zr",
        "purl": "pkg:deb/ubuntu/py7zr@0.11.3+dfsg-4ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.3+dfsg-1",
        "0.11.3+dfsg-1ubuntu1",
        "0.11.3+dfsg-2",
        "0.11.3+dfsg-3",
        "0.11.3+dfsg-4",
        "0.11.3+dfsg-4ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-py7zr",
            "binary_version": "0.11.3+dfsg-8build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "py7zr",
        "purl": "pkg:deb/ubuntu/py7zr@0.11.3+dfsg-8build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.3+dfsg-6",
        "0.11.3+dfsg-7",
        "0.11.3+dfsg-8",
        "0.11.3+dfsg-8build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-py7zr",
            "binary_version": "1.0.0+dfsg1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "py7zr",
        "purl": "pkg:deb/ubuntu/py7zr@1.0.0+dfsg1-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.22.0+dfsg-1",
        "1.0.0+dfsg1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python3-py7zr",
            "binary_version": "1.1.2+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "py7zr",
        "purl": "pkg:deb/ubuntu/py7zr@1.1.2+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0+dfsg1-1",
        "1.0.0+dfsg1-3",
        "1.0.0+dfsg1-4",
        "1.0.0+dfsg1-5",
        "1.1.2+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr\u0027s Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3.",
  "id": "UBUNTU-CVE-2026-55195",
  "modified": "2026-07-15T17:53:44Z",
  "published": "2026-07-08T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-55195"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-55195"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/miurahr/py7zr/releases/tag/v1.1.3"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-55195"
  ]
}



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