# py7zr (PyPI) vulnerabilities

4 known vulnerabilities (1 critical, 3 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 1.1.4 (Oct 12, 2026): no advisory affects it
- Newest unaffected release: 1.1.4 (Oct 12, 2026), the latest release
- Weekly downloads: 2.7M
- Dependents: 425
- Releases: 166 since 0.0.3 (Apr 22, 2019)
- Registry: https://pypi.org/project/py7zr/
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-55206: 0.0.3 to 1.1.2 (1.1.3 is outside it)
- CVE-2026-55195: 0.0.3 to 1.1.2 (1.1.3 is outside it)
- CVE-2026-23879: 0.0.3 to 1.1.2 (1.1.3 is outside it)
- CVE-2022-44900: 0.0.3 to 0.20.0 (0.20.1 is outside it)

## Advisories (4)

### [CVE-2026-55206](https://cve.now/CVE-2026-55206): py7zr: O(n^2) algorithmic complexity DoS in PackInfo.\_read()

- Severity: High 8.7
- Published: Jul 8, 2026
- Affected: fixed in 1.1.3.
- Fixed in 1.1.3 (released Jun 19, 2026, 19 days before disclosure).
- The latest release, 1.1.4, is not affected.

### [CVE-2026-55195](https://cve.now/CVE-2026-55195): py7zr: Decompression bomb (zip bomb) denial of service via unchecked extraction size

- Severity: High 8.7
- Published: Jul 8, 2026
- Affected: fixed in 1.1.3.
- Fixed in 1.1.3 (released Jun 19, 2026, 19 days before disclosure).
- The latest release, 1.1.4, is not affected.

### [CVE-2026-23879](https://cve.now/CVE-2026-23879): py7zr: Arbitrary File Write Vulnerability

- Severity: High 8.0
- Published: Jun 24, 2026
- Affected: fixed in 1.1.3.
- Fixed in 1.1.3 (released Jun 19, 2026, 5 days before disclosure).
- The latest release, 1.1.4, is not affected.

### [CVE-2022-44900](https://cve.now/CVE-2022-44900): A directory traversal vulnerability in the SevenZipFile.extractall() function of the python library py7zr v0.20.0 and earlier allows…

- Severity: Critical 9.1
- Published: Dec 6, 2022
- Affected: fixed in 0.20.1; fixed in 0.20.1.
- Fixed in 0.20.1 (released Nov 1, 2022, 35 days before disclosure).
- The latest release, 1.1.4, is not affected.

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