Hi, this is basically just a PSA... 

If you happen to use zlib on z/os, or bundle it with a z/OS product, you may 
want to consider applying APAR OA57154 which addresses a known but rare zlib 
decompression bug. 

The bug exists in the IBM customized version of zlib shipped with z/OS 2.1, 2.2 
and 2.3 all of which use a very early mod level of zlib V1.2.7. The IBM APAR 
incorporates a much more recent mod level of zlib - 1.2.11, which definitely 
contains a fix for the bug. It should be noted that the decompression bug in 
V1.2.7.0 of zlib is a non-issue when zEDC adapters are being used for 
decompression. 

HTH, 
Mike

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