PyPi: H11

CVE-2025-43859

Safety vulnerability ID: 76903

This vulnerability was reviewed by experts

The information on this page was manually curated by our Cybersecurity Intelligence Team.

Created at Apr 24, 2025 Updated at Apr 25, 2025

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Advisory

A leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions.

Affected package

h11

Latest version: 0.16.0

A pure-Python, bring-your-own-I/O implementation of HTTP/1.1

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

https://github.com/advisories/GHSA-vqfr-h8mv-ghfj
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-43859

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