diff --git a/backport-der-builder-Fix-possible-uninitialized-variable.patch b/backport-der-builder-Fix-possible-uninitialized-variable.patch
new file mode 100644
index 0000000..2547c9f
--- /dev/null
+++ b/backport-der-builder-Fix-possible-uninitialized-variable.patch
@@ -0,0 +1,31 @@
+From 75e94db38ccd9ed166b40fb2d8aaed7c094cff69 Mon Sep 17 00:00:00 2001
+From: Jakub Jelen <jjelen@redhat.com>
+Date: Mon, 12 Feb 2024 09:52:43 +0100
+Subject: [PATCH] der-builder: Fix possible uninitialized variable.
+
+* src/der-builder.c (_ksba_der_builder_get): Initialize ERR.
+
+--
+
+GnuPG-bug-id: 6992
+Signed-off-by: Jakub Jelen <jjelen@redhat.com>
+---
+ src/der-builder.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/der-builder.c b/src/der-builder.c
+index 768bd0f..d136bb8 100644
+--- a/src/der-builder.c
++++ b/src/der-builder.c
+@@ -549,7 +549,7 @@ compute_lengths (ksba_der_t d, int idx)
+ gpg_error_t
+ _ksba_der_builder_get (ksba_der_t d, unsigned char **r_obj, size_t *r_objlen)
+ {
+-  gpg_error_t err;
++  gpg_error_t err = 0;
+   int idx;
+   unsigned char *buffer = NULL;
+   unsigned char *p;
+-- 
+2.33.0
+
diff --git a/libksba.spec b/libksba.spec
index 111d505..02e4211 100644
--- a/libksba.spec
+++ b/libksba.spec
@@ -1,12 +1,14 @@
 Name:     libksba
 Version:  1.6.4
-Release:  1
+Release:  2
 Summary:  A library for X.509 and CMS
 License:  (LGPL-3.0+ or GPL-2.0+) and GPL-3.0+ and MIT
 URL:      https://www.gnupg.org/software/libksba/index.html
 Source0:  https://www.gnupg.org/ftp/gcrypt/libksba/libksba-%{version}.tar.bz2
 Source1:  https://www.gnupg.org/ftp/gcrypt/libksba/libksba-%{version}.tar.bz2.sig
 
+Patch1:   backport-der-builder-Fix-possible-uninitialized-variable.patch
+
 BuildRequires: gcc gawk libgpg-error-devel >= 1.8 libgcrypt-devel >= 1.2.0
 
 %description
@@ -65,6 +67,12 @@ make check
 %{_datadir}/info/ksba.info.gz
 
 %changelog
+* Tue Jul 30 2024 yixiangzhike <yixiangzhike007@163.com> - 1.6.4-2
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:backport upstream patch to fix possible uninitialized variable
+
 * Tue Feb 27 2024 yixiangzhike <yixiangzhike007@163.com> - 1.6.4-1
 - Type:enhancement
 - ID:NA