diff --git a/SOURCES/zlib-1.2.11-IBM-Z-hw-accelrated-deflate-compressBound-fix.patch b/SOURCES/zlib-1.2.11-IBM-Z-hw-accelrated-deflate-compressBound-fix.patch
new file mode 100644
index 0000000..27454ab
--- /dev/null
+++ b/SOURCES/zlib-1.2.11-IBM-Z-hw-accelrated-deflate-compressBound-fix.patch
@@ -0,0 +1,93 @@
+Source from https://gitlab.com/redhat/centos-stream/rpms/zlib/-/merge_requests/9
+Author: Ilya Leoshkevich
+
+--- a/compress.c
++++ b/compress.c
+@@ -5,9 +5,15 @@
+ 
+ /* @(#) $Id$ */
+ 
+-#define ZLIB_INTERNAL
++#include "zutil.h"
+ #include "zlib.h"
+ 
++#ifdef DFLTCC
++#  include "contrib/s390/dfltcc.h"
++#else
++#define DEFLATE_BOUND_COMPLEN(source_len) 0
++#endif
++
+ /* ===========================================================================
+      Compresses the source buffer into the destination buffer. The level
+    parameter has the same meaning as in deflateInit.  sourceLen is the byte
+@@ -81,6 +87,12 @@ int ZEXPORT compress (dest, destLen, source, sourceLen)
+ uLong ZEXPORT compressBound (sourceLen)
+     uLong sourceLen;
+ {
++    uLong complen = DEFLATE_BOUND_COMPLEN(sourceLen);
++
++    if (complen > 0)
++	/* Architecture-specific code provided an upper bound. */
++	return complen + ZLIB_WRAPLEN;
++
+     return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
+            (sourceLen >> 25) + 13;
+ }
+--- a/contrib/s390/dfltcc.h
++++ b/contrib/s390/dfltcc.h
+@@ -12,6 +12,28 @@ void ZLIB_INTERNAL dfltcc_reset OF((z_streamp strm, uInt size));
+ voidpf ZLIB_INTERNAL dfltcc_alloc_window OF((z_streamp strm, uInt items,
+                                              uInt size));
+ void ZLIB_INTERNAL dfltcc_free_window OF((z_streamp strm, voidpf w));
++#define DFLTCC_BLOCK_HEADER_BITS 3
++#define DFLTCC_HLITS_COUNT_BITS 5
++#define DFLTCC_HDISTS_COUNT_BITS 5
++#define DFLTCC_HCLENS_COUNT_BITS 4
++#define DFLTCC_MAX_HCLENS 19
++#define DFLTCC_HCLEN_BITS 3
++#define DFLTCC_MAX_HLITS 286
++#define DFLTCC_MAX_HDISTS 30
++#define DFLTCC_MAX_HLIT_HDIST_BITS 7
++#define DFLTCC_MAX_SYMBOL_BITS 16
++#define DFLTCC_MAX_EOBS_BITS 15
++#define DFLTCC_MAX_PADDING_BITS 7
++#define DEFLATE_BOUND_COMPLEN(source_len) \
++    ((DFLTCC_BLOCK_HEADER_BITS + \
++      DFLTCC_HLITS_COUNT_BITS + \
++      DFLTCC_HDISTS_COUNT_BITS + \
++      DFLTCC_HCLENS_COUNT_BITS + \
++      DFLTCC_MAX_HCLENS * DFLTCC_HCLEN_BITS + \
++      (DFLTCC_MAX_HLITS + DFLTCC_MAX_HDISTS) * DFLTCC_MAX_HLIT_HDIST_BITS + \
++      (source_len) * DFLTCC_MAX_SYMBOL_BITS + \
++      DFLTCC_MAX_EOBS_BITS + \
++      DFLTCC_MAX_PADDING_BITS) >> 3)
+ int ZLIB_INTERNAL dfltcc_can_inflate OF((z_streamp strm));
+ typedef enum {
+     DFLTCC_INFLATE_CONTINUE,
+diff --git a/contrib/s390/dfltcc_deflate.h b/contrib/s390/dfltcc_deflate.h
+index 03f7f53..46acfc5 100644
+--- a/contrib/s390/dfltcc_deflate.h
++++ b/contrib/s390/dfltcc_deflate.h
+@@ -46,8 +46,7 @@ int ZLIB_INTERNAL dfltcc_deflate_get_dictionary OF((z_streamp strm,
+ #define DEFLATE_BOUND_ADJUST_COMPLEN(strm, complen, source_len) \
+     do { \
+         if (dfltcc_can_deflate((strm))) \
+-            (complen) = (3 + 5 + 5 + 4 + 19 * 3 + (286 + 30) * 7 + \
+-                         (source_len) * 16 + 15 + 7) >> 3; \
++            (complen) = DEFLATE_BOUND_COMPLEN(source_len); \
+     } while (0)
+ #define DEFLATE_NEED_CONSERVATIVE_BOUND(strm) (dfltcc_can_deflate((strm)))
+ #define DEFLATE_HOOK dfltcc_deflate
+diff --git a/zutil.h b/zutil.h
+index 14277bc..cf90e49 100644
+--- a/zutil.h
++++ b/zutil.h
+@@ -87,6 +87,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
+ 
+ #define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
+ 
++#define ZLIB_WRAPLEN 6 /* zlib format overhead */
++
+         /* target dependencies */
+ 
+ #if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
diff --git a/SPECS/zlib.spec b/SPECS/zlib.spec
index 5c9a94b..07877f7 100644
--- a/SPECS/zlib.spec
+++ b/SPECS/zlib.spec
@@ -3,7 +3,7 @@
 
 Name:    zlib
 Version: 1.2.11
-Release: 19%{?dist}
+Release: 20%{?dist}
 Summary: The compression and decompression library
 # /contrib/dotzlib/ have Boost license
 License: zlib and Boost
@@ -32,8 +32,10 @@ Patch8: zlib-1.2.11-IBM-DFLTCC-compression-level-switching-issues.patch
 # fixed inflateSyncPoint() bad return value on z15
 Patch9: zlib-1.2.11-inflateSyncPoint-return-value-fix.patch
 Patch10: zlib-1.2.11-CVE-2018-25032.patch
+# Fix the compressBound() on z15
+Patch11: zlib-1.2.11-IBM-Z-hw-accelrated-deflate-compressBound-fix.patch
 
-# Patches for CVE-2022-37434
+# Fix CVE-2022-37434
 Patch12: zlib-1.2.11-cve-2022-37434.patch
 Patch13: zlib-1.2.11-cve-2022-37434_2.patch
 
@@ -99,9 +101,11 @@ developing applications which use minizip.
 %patch8 -p1
 %patch9 -p1
 %patch10 -p1
+%patch11 -p1
 %patch12 -p1
 %patch13 -p1
 
+
 iconv -f iso-8859-2 -t utf-8 < ChangeLog > ChangeLog.tmp
 mv ChangeLog.tmp ChangeLog
 
@@ -180,10 +184,15 @@ find $RPM_BUILD_ROOT -name '*.la' -delete
 
 
 %changelog
-* Tue Aug 09 2022 Matej Mužila <mmuzila@redhat.com> - 1.2.11.19
+* Tue Aug 09 2022 Matej Mužila <mmuzila@redhat.com> - 1.2.11-20
 - Fix heap-based buffer over-read or buffer overflow in inflate in inflate.c
 - Resolves: CVE-2022-37434
 
+* Mon May 16 2022 Lukas Javorsky <ljavorsk@redhat.com> - 1.2.11-19
+- Apply IBM patch for compressBound() function
+- Source from https://github.com/madler/zlib/issues/410#issuecomment-947212824
+- Resolves: #2056900
+
 * Tue Mar 29 2022 Matej Mužila <mmuzila@redhat.com> - 1.2.11-18
 - Resolves: CVE-2018-25032