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CVE-2026-23527

🔴 HIGH

H3 is a minimal H(TTP) framework built for high performance and portability. Prior to 1.15.5, there is a critical HTTP Request Smuggling vulnerability. readRawBody is doing a strict case-sensitive che...

Published
Jan 15, 2026
Last Modified
Jan 16, 2026
Views
9
Bookmarks
0

Description

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H3 is a minimal H(TTP) framework built for high performance and portability. Prior to 1.15.5, there is a critical HTTP Request Smuggling vulnerability. readRawBody is doing a strict case-sensitive check for the Transfer-Encoding header. It explicitly looks for "chunked", but per the RFC, this header should be case-insensitive. This vulnerability is fixed in 1.15.5.

CVSS Scores

CVSS 3.1 8.9
8.9
HIGH
CVSS 2.0 8.9

References

github.com github.com

Additional Information

Source
security-advisories@github.com
State
Undergoing analysis

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