Security advisory

{
  "id": "3bf4d7a87a49495d0b3389b31ba3a29b9f512036e1f696cb7735960a4effcb53",
  "url": "https://osv.dev/vulnerability/CVE-2021-32841",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-32841",
    "summary": "SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.3.0 and prior to version 1.3.3, a check was added if the destination file is under destination directory. However, it is not enforced that `destDir` ends with slash. If the `destDir` is not slash terminated like `/home/user/dir` it is possible to create a file with a name thats begins with the destination directory, i.e. `/home/user/dir.sh`. Because of the file name and destination directory constraints, the arbitrary file creation impact is limited and depends on the use case. Version 1.3.3 contains a patch for this vulnerability.",
    "evidence": "osv:CVE-2021-32841",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-32841",
      "aliases": [
        "CVE-2021-32841",
        "GHSA-2x7h-96h5-rq84"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/icsharpcode/sharpziplib",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8f7d89201afa13c814f9b3d1813884ffe0ec7025"
                },
                {
                  "fixed": "1b1ab013ce1df02d8f27cf582197759c614d9126"
                },
                {
                  "fixed": "5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:sharpziplib_project:sharpziplib:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.3.0"
                      },
                      {
                        "fixed": "1.3.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1b1ab013ce1df02d8f27cf582197759c614d9126"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.3.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.3.2",
            "v1.3.1",
            "v1.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32841.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:46.304071934Z",
      "provider": "osv",
      "references": [
        "https://github.com/icsharpcode/SharpZipLib/releases/tag/v1.3.3",
        "https://github.com/icsharpcode/SharpZipLib/commit/5c3b293de5d65b108e7f2cd0ea8f81c1b8273f78",
        "https://securitylab.github.com/advisories/GHSL-2021-125-sharpziplib/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-32841",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384605,
  "published_at": "2022-01-26T22:15:07.837+00:00"
}