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Date: Wed, 23 Mar 2022 20:49:49 -0700
From: Tavis Ormandy <>
Subject: zlib memory corruption on deflate (i.e. compress)

Greetings list, I was recently trying to track down a reproducible crash
in a compressor. Believe it or not, it really was a bug in
zlib-1.2.11 when compressing (not decompressing!) certain inputs.

I reported it upstream, but it turns out the issue has been public since
2018, but the patch never made it into a release. As far as I know,
nobody ever assigned it a CVE.

As far as I can tell, no distros have picked this up.


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