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Date: Thu, 4 Jun 2015 00:29:04 +0200
From: Hanno Böck <>
Subject: Null pointer access in inflatehd tool (nghttp2)

The nghttp2 library ships two tools to parse http headers packed with
the hpack algorithm. An invalid input file can crash the inflatehd
tool. This is a bug in the tool, there is no issue in the library.

This issue was fixed in version 0.7.15 of nghttp2.

One day of fuzzing both the inflatehd and deflatehd turned up no other

Sample input file
Git commit / patch
Upstream bug report
nghttp 0.7.15 release notes

Hanno Böck


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