# hpack (PyPI) vulnerabilities

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

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://pypi.org/project/hpack/

## Advisories (2)

### [CVE-2026-59980](https://cve.now/CVE-2026-59980): hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

- Severity: Medium 6.3
- Published: Sep 23, 2026
- Affected: fixed in 4.2.0.

### [CVE-2016-6581](https://cve.now/CVE-2016-6581): A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of…

- Severity: Unrated
- Published: Jan 10, 2017
- Affected: from 1.0.0, fixed in 2.3.0; fixed in 2.3.0.

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