diff --git a/backport-CVE-2022-33065.patch b/backport-CVE-2022-33065.patch
new file mode 100644
index 0000000000000000000000000000000000000000..3bc3f1920f717d9beb4742c448b357e68c659601
--- /dev/null
+++ b/backport-CVE-2022-33065.patch
@@ -0,0 +1,42 @@
+From da1fcb0199f6a5c883fd158a20896a0e9c085e02 Mon Sep 17 00:00:00 2001
+From: Alex Stewart <alex.stewart@ni.com>
+Date: Wed, 22 Nov 2023 17:15:12 +0800
+Subject: [PATCH] mat4/mat5: fix int overflow in dataend calculation
+The clang sanitizer warns of a possible signed integer overflow when
+calculating the `dataend` value in `mat4_read_header()`.
+ 
+```
+src/mat4.c:323:41: runtime error: signed integer overflow: 205 * -100663296 cannot be represented in type 'int'
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/mat4.c:323:41 in
+src/mat4.c:323:48: runtime error: signed integer overflow: 838860800 * 4 cannot be represented in type 'int'
+SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior src/mat4.c:323:48 in
+```
+ 
+Cast the offending `rows` and `cols` ints to `sf_count_t` (the type of
+`dataend` before performing the calculation, to avoid the issue.
+ 
+CVE: CVE-2022-33065
+Fixes: https://github.com/libsndfile/libsndfile/issues/789
+Fixes: https://github.com/libsndfile/libsndfile/issues/833
+ 
+Signed-off-by: Alex Stewart <alex.stewart@ni.com>
+---
+ src/mat4.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+ 
+diff --git a/src/mat4.c b/src/mat4.c
+index 3c73680..e2f98b7 100644
+--- a/src/mat4.c
++++ b/src/mat4.c
+@@ -320,7 +320,7 @@ mat4_read_header (SF_PRIVATE *psf)
+ 				psf->filelength - psf->dataoffset, psf->sf.channels * psf->sf.frames * psf->bytewidth) ;
+ 		}
+ 	else if ((psf->filelength - psf->dataoffset) > psf->sf.channels * psf->sf.frames * psf->bytewidth)
+-		psf->dataend = psf->dataoffset + rows * cols * psf->bytewidth ;
++		psf->dataend = psf->dataoffset + (sf_count_t) rows * (sf_count_t) cols * psf->bytewidth ;
+ 
+ 	psf->datalength = psf->filelength - psf->dataoffset - psf->dataend ;
+ 
+-- 
+2.27.0
+
diff --git a/libsndfile.spec b/libsndfile.spec
index 2c8a23db4f16a0a5a25524cd222e4ccc28b7fd11..efbfd1b4c85cbb94f84efc19ac331991597652d0 100644
--- a/libsndfile.spec
+++ b/libsndfile.spec
@@ -1,6 +1,6 @@
 Name: libsndfile
 Version: 1.0.28
-Release: 20
+Release: 21
 Summary: Library for reading and writing sound files
 License: LGPLv2+ and GPLv2+ and BSD
 URL: http://www.mega-nerd.com/libsndfile/
@@ -23,6 +23,7 @@ Patch6005:	libsndfile-1.0.28-CVE-2017-14634.patch
 Patch6006:	libsndfile-1.0.28-CVE-2017-8362.patch
 Patch6007:	backport-CVE-2021-3246.patch
 Patch6008:	backport-CVE-2021-4156.patch
+Patch6009:  backport-CVE-2022-33065.patch
 
 %description
 Libsndfile is a C library for reading and writing files containing
@@ -129,6 +130,11 @@ LD_LIBRARY_PATH=$PWD/src/.libs make check
 %{_mandir}/man1/sndfile-salvage.1*
 
 %changelog
+* Thu Dec 21 2023 xuyuchao <xu.yuchao@xfusion.com> - 1.0.28-21
+- Type:CVE
+- CVE:CVE-2023-33065
+- DESC:fix CVE-2023-33065
+
 * Mon May 16 2022 zhouwenpei <zhouwenpei1@h-partners.com> - 1.0.28-20
 - fix CVE-2021-4156