CVE ID : CVE-2025-43859
Published : April 24, 2025, 7:15 p.m. | 4 hours, 11 minutes ago
Description : 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.
Severity: 9.1 | CRITICAL
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