Security Advisory

CVE-2025-43859

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2025-04-24 18:15:53

Last updated 2025-04-24 19:02:45

Assigner GitHub_M

State PUBLISHED

Description

h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11s 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.

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