diff --git a/backport-CVE-2022-47629-Fix-an-integer-overflow-in-the-CRL-signature-parser.patch b/backport-CVE-2022-47629-Fix-an-integer-overflow-in-the-CRL-signature-parser.patch
new file mode 100644
index 0000000000000000000000000000000000000000..62921896d180bf5ace4cd47ff9b292959a725adb
--- /dev/null
+++ b/backport-CVE-2022-47629-Fix-an-integer-overflow-in-the-CRL-signature-parser.patch
@@ -0,0 +1,68 @@
+From f61a5ea4e0f6a80fd4b28ef0174bee77793cf070 Mon Sep 17 00:00:00 2001
+From: Werner Koch <wk@gnupg.org>
+Date: Tue, 22 Nov 2022 16:36:46 +0100
+Subject: [PATCH] Fix an integer overflow in the CRL signature parser.
+
+* src/crl.c (parse_signature): N+N2 now checked for overflow.
+
+* src/ocsp.c (parse_response_extensions): Do not accept too large
+values.
+(parse_single_extensions): Ditto.
+--
+
+The second patch is an extra safegourd not related to the reported
+bug.
+
+GnuPG-bug-id: 6284
+Reported-by: Joseph Surin, elttam
+---
+ src/crl.c  |  2 +-
+ src/ocsp.c | 12 ++++++++++++
+ 2 files changed, 13 insertions(+), 1 deletion(-)
+
+diff --git a/src/crl.c b/src/crl.c
+index 9f71c85..2e6ca29 100644
+--- a/src/crl.c
++++ b/src/crl.c
+@@ -1349,7 +1349,7 @@ parse_signature (ksba_crl_t crl)
+          && !ti.is_constructed) )
+     return gpg_error (GPG_ERR_INV_CRL_OBJ);
+   n2 = ti.nhdr + ti.length;
+-  if (n + n2 >= DIM(tmpbuf))
++  if (n + n2 >= DIM(tmpbuf) || (n + n2) < n)
+     return gpg_error (GPG_ERR_TOO_LARGE);
+   memcpy (tmpbuf+n, ti.buf, ti.nhdr);
+   err = read_buffer (crl->reader, tmpbuf+n+ti.nhdr, ti.length);
+diff --git a/src/ocsp.c b/src/ocsp.c
+index d4cba04..657d15f 100644
+--- a/src/ocsp.c
++++ b/src/ocsp.c
+@@ -721,6 +721,12 @@ parse_response_extensions (ksba_ocsp_t ocsp,
+           else
+             ocsp->good_nonce = 1;
+         }
++      if (ti.length > (1<<24))
++        {
++          /* Bail out on much too large objects.  */
++          err = gpg_error (GPG_ERR_BAD_BER);
++          goto leave;
++        }
+       ex = xtrymalloc (sizeof *ex + strlen (oid) + ti.length);
+       if (!ex)
+         {
+@@ -788,6 +794,12 @@ parse_single_extensions (struct ocsp_reqitem_s *ri,
+       err = parse_octet_string (&data, &datalen, &ti);
+       if (err)
+         goto leave;
++      if (ti.length > (1<<24))
++        {
++          /* Bail out on much too large objects.  */
++          err = gpg_error (GPG_ERR_BAD_BER);
++          goto leave;
++        }
+       ex = xtrymalloc (sizeof *ex + strlen (oid) + ti.length);
+       if (!ex)
+         {
+-- 
+2.27.0
+
diff --git a/libksba.spec b/libksba.spec
index 46ff7965dc72032c0a9e46c513206d4e2e987e24..2f0cc303700d45ba95a5c8461d9d2c91daae6c7c 100644
--- a/libksba.spec
+++ b/libksba.spec
@@ -1,6 +1,6 @@
 Name:     libksba
 Version:  1.4.0
-Release:  3
+Release:  4
 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
@@ -8,6 +8,7 @@ Source0:  ftp://ftp.gnupg.org/gcrypt/libksba/libksba-%{version}.tar.bz2
 Source1:  ftp://ftp.gnupg.org/gcrypt/libksba/libksba-%{version}.tar.bz2.sig
 
 Patch1:   backport-CVE-2022-3515-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch
+Patch2:   backport-CVE-2022-47629-Fix-an-integer-overflow-in-the-CRL-signature-parser.patch
 
 BuildRequires: gcc gawk libgpg-error-devel >= 1.8 libgcrypt-devel >= 1.2.0
 
@@ -68,6 +69,12 @@ make check
 %{_datadir}/info/ksba.info.gz
 
 %changelog
+* Thu Dec 22 2022 yixiangzhike <yixiangzhike007@163.com> - 1.4.0-4
+- Type:cve
+- ID:CVE-2022-47629
+- SUG:NA
+- DESC:fix CVE-2022-47629
+
 * Wed Oct 19 2022 yixiangzhike <yixiangzhike007@163.com> - 1.4.0-3
 - Type:cve
 - ID:CVE-2022-3515