# brotli (PyPI) vulnerabilities

4 known vulnerabilities (2 critical, 1 high, 1 medium), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 1.2.1 (Oct 22, 2026): no advisory affects it
- Newest unaffected release: 1.2.1 (Oct 22, 2026), the latest release
- Weekly downloads: 28.4M
- Dependents: 5,832
- Releases: 11 since 0.5.2 (Oct 12, 2016)
- Registry: https://pypi.org/project/brotli/
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-111497: 0.5.2 to 1.2.0 (1.2.1 is outside it)
- CVE-2025-6176: 0.5.2 to 1.1.0 (1.2.0 is outside it)
- CVE-2020-36846: 0.5.2 to 1.0.7 (1.0.8 is outside it)
- CVE-2020-8927: 0.5.2 to 1.0.7 (1.0.8 is outside it)

## Advisories (4)

### [CVE-2026-111497](https://cve.now/CVE-2026-111497): Out-of-Bounds Write in Google Brotli Decoder

- Severity: Critical 9.2 · KEV
- Published: Oct 22, 2026
- Affected: fixed in 1.2.1; from 1.0.3, fixed in 1.2.1.
- Fixed in 1.2.1 (released Oct 22, 2026, the day of disclosure).
- The latest release, 1.2.1, is not affected.

### [CVE-2025-6176](https://cve.now/CVE-2025-6176): Brotli decompression bomb DoS in scrapy/scrapy

- Severity: High 7.5
- Published: Oct 31, 2025
- Affected: fixed in 1.2.0.
- Fixed in 1.2.0 (released Nov 5, 2025, 5 days after disclosure).
- The latest release, 1.2.1, is not affected.

### [CVE-2020-36846](https://cve.now/CVE-2020-36846): IO::Compress::Brotli versions prior to 0.007 for Perl have an integer overflow in the bundled Brotli C library

- Severity: Critical 9.8
- Published: May 30, 2025
- Affected: fixed in 1.0.8.
- Fixed in 1.0.8 (released Aug 27, 2020, 1737 days before disclosure).
- The latest release, 1.2.1, is not affected.

### [CVE-2020-8927](https://cve.now/CVE-2020-8927): Buffer overflow in Brotli library

- Severity: Medium 5.3
- Published: Sep 15, 2020
- Affected: fixed in 1.0.8.
- Fixed in 1.0.8 (released Aug 27, 2020, 19 days before disclosure).
- The latest release, 1.2.1, is not affected.

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