CVE-2023-45853 — Vulnerability in pyminizip — CVE Details
CRITICAL
pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency
Published June 29, 2026Updated July 1, 2026Source: osv
Summary
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.
Advisory Timeline
- First published June 29, 2026 (105 days ago).
- Last revised July 1, 2026 — 2 days after initial publication.
Affected Packages (1)
Affects 1 ecosystem: pypi (1).
| Package | Ecosystem | Affected | Fixed In |
|---|---|---|---|
| pyminizip | pypi | 0.0.1, 0.0.2, 0.1.0, 0.1.1 (+7 more) | Range-based data available |
CVSS Score Breakdown
What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://nvd.nist.gov/vuln/detail/CVE-2023-45853ADVISORY
- https://github.com/madler/zlib/pull/843WEB
- https://github.com/madler/zlib/commit/73331a6a0481067628f065ffe87bb1d8f787d10cWEB
- https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356WEB
- https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61WEB
- https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4WEB
- https://github.com/smihica/pyminizipPACKAGE
- https://github.com/smihica/pyminizip/blob/master/zlib-1.2.11/contrib/minizip/zip.cWEB
- https://lists.debian.org/debian-lts-announce/2023/11/msg00026.htmlWEB
- https://pypi.org/project/pyminizip/#historyWEB
- https://security.gentoo.org/glsa/202401-18WEB
- https://security.netapp.com/advisory/ntap-20231130-0009WEB
- https://www.winimage.com/zLibDll/minizip.htmlWEB
- https://www.openwall.com/lists/oss-security/2023/10/20/9WEB
- https://www.openwall.com/lists/oss-security/2024/01/24/10WEB
- https://pypi.org/project/pyminizipPACKAGE
- https://github.com/advisories/GHSA-mq29-j5xf-cjwrADVISORY
Frequently Asked Questions
- What is CVE-2023-45853?
- pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
- How do I check if my project is affected by CVE-2023-45853?
- CVE-2023-45853 affects pyminizip. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2023-45853 and 200,000+ other known vulnerabilities.
Severity & Exploitability
CVSS Score
9.8
Exploitation is straightforward and causes maximum impact. Patch immediately.
Also Known As
PYSEC-2026-501
GHSA-mq29-j5xf-cjwr
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