PYSEC-2026-501

Vulnerability from pysec - Published: 2026-06-29 11:50 - Updated: 2026-06-29 12:05
VLAI
Details

MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. NOTE: MiniZip is not a supported part of the zlib product.

pyminizip uses version 1.2.11 of zlib's code.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impacted products
Name purl
pyminizip
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyminizip"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "0.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0.1",
        "0.0.2",
        "0.1.0",
        "0.1.1",
        "0.2.0",
        "0.2.1",
        "0.2.2",
        "0.2.3",
        "0.2.4",
        "0.2.5",
        "0.2.6"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-45853",
    "GHSA-mq29-j5xf-cjwr"
  ],
  "details": "MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. NOTE: MiniZip is not a supported part of the zlib product.\n\npyminizip uses version 1.2.11 of zlib\u0027s code.",
  "id": "PYSEC-2026-501",
  "modified": "2026-06-29T12:05:45.228852Z",
  "published": "2026-06-29T11:50:43.774027Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-45853"
    },
    {
      "type": "WEB",
      "url": "https://github.com/madler/zlib/pull/843"
    },
    {
      "type": "WEB",
      "url": "https://github.com/madler/zlib/commit/73331a6a0481067628f065ffe87bb1d8f787d10c"
    },
    {
      "type": "WEB",
      "url": "https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356"
    },
    {
      "type": "WEB",
      "url": "https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61"
    },
    {
      "type": "WEB",
      "url": "https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/smihica/pyminizip"
    },
    {
      "type": "WEB",
      "url": "https://github.com/smihica/pyminizip/blob/master/zlib-1.2.11/contrib/minizip/zip.c"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/11/msg00026.html"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/pyminizip/#history"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/202401-18"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20231130-0009"
    },
    {
      "type": "WEB",
      "url": "https://www.winimage.com/zLibDll/minizip.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2023/10/20/9"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2024/01/24/10"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/pyminizip"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-mq29-j5xf-cjwr"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "pyminizip affected by zlib\u0027s integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency"
}


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