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NVD Vulnerability Details :

CVE-2025-43859

Awaiting Analysis

Source-security-advisories@github.com

Published At-24 Apr, 2025 | 19:15

Updated At-29 Apr, 2025 | 13:52

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	9.1	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE ID	Type	Source
CWE-444	Primary	security-advisories@github.com

References

Hyperlink	Source	Resource
https://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed	security-advisories@github.com	N/A
https://github.com/python-hyper/h11/security/advisories/GHSA-vqfr-h8mv-ghfj	security-advisories@github.com	N/A

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