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Date: Wed, 9 Mar 2016 20:21:45 +0100
From: Hanno Böck <>
Subject: Heap use after free in Pidgin-OTR plugin

The pidgin-otr plugin version 4.0.2 fixes a heap use after free error.
The bug is triggered when a user tries to authenticate a buddy and
happens in the function create_smp_dialog.

The bug was discovered with Address Sanitizer. This is yet another
example why all C/C++ code should be tested with Address Sanitizer

This bug was already independently discovered and reported in the otr
bug tracker.

Independend of this bug another more severe bug in Libotr itself was
also disclosed today, please make sure you update both libotr (4.1.1)
and the pidgin-otr plugin (4.0.2).

Upstream bug report (contains Address Sanitizer stack trace):
Commit / fix:

Hanno Böck


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