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CVE-2023-45853 Critical

pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency

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.

Exploit probability 3.2%
Published October 14, 2023
Required by Not available
Last source change June 29, 2026

02 / AFFECTED SOFTWARE

Affected packages

Unknown Unknown

74 explicit affected versions

PyPI pyminizip

11 explicit affected versions

PyPI pyminizip

11 explicit affected versions

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities CVE-2023-45853

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. NOTE: pyminizip through 0.2.6 is also vulnerable because it bundles an affected zlib version, and exposes the applicable MiniZip code through its compress API.

View original source
Open Source Vulnerabilities PYSEC-2026-501

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.

View original source
Open Source Vulnerabilities GHSA-mq29-j5xf-cjwr

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.

View original source

05 / REFERENCES

Further evidence