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Date: Mon, 7 Jun 2021 13:46:43 +0200
From: Oswald Buddenhagen <>
Subject: CVE-2021-3578: possible remote code execution in isync/mbsync


A flaw was found in mbsync before v1.3.6 and v1.4.2, where an unchecked
pointer cast allows a malicious or compromised server to write an
arbitrary integer value past the end of a heap-allocated structure by
issuing an unexpected APPENDUID response. This could be plausibly
exploited for remote code execution on the client.


upgrade to the freshly released v1.3.6 or v1.4.2 available from , or apply the 
matching attached patch.


This problem was found by Lukas Braun <> using a

View attachment "fix-handling-of-unexpected-APPENDUID-response-code--1.3.patch" of type "text/x-diff" (3187 bytes)

View attachment "fix-handling-of-unexpected-APPENDUID-response-code--1.4.patch" of type "text/x-diff" (3167 bytes)

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