diff --git a/backport-CVE-2022-3515-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch b/backport-CVE-2022-3515-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch
new file mode 100644
index 0000000..26cf34b
--- /dev/null
+++ b/backport-CVE-2022-3515-Detect-a-possible-overflow-directly-in-the-TLV-parse.patch
@@ -0,0 +1,42 @@
+From 4b7d9cd4a018898d7714ce06f3faf2626c14582b Mon Sep 17 00:00:00 2001
+From: Werner Koch <wk@gnupg.org>
+Date: Wed, 5 Oct 2022 14:19:06 +0200
+Subject: [PATCH] Detect a possible overflow directly in the TLV parser.
+
+* src/ber-help.c (_ksba_ber_read_tl): Check for overflow of a commonly
+used sum.
+--
+
+It is quite common to have checks like
+
+    if (ti.nhdr + ti.length >= DIM(tmpbuf))
+       return gpg_error (GPG_ERR_TOO_LARGE);
+
+This patch detects possible integer overflows immmediately when
+creating the TI object.
+
+Reported-by: ZDI-CAN-18927, ZDI-CAN-18928, ZDI-CAN-18929
+---
+ src/ber-help.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/src/ber-help.c b/src/ber-help.c
+index 81c31ed..56efb6a 100644
+--- a/src/ber-help.c
++++ b/src/ber-help.c
+@@ -182,6 +182,12 @@ _ksba_ber_read_tl (ksba_reader_t reader, struct tag_info *ti)
+       ti->length = len;
+     }
+ 
++  if (ti->length > ti->nhdr && (ti->nhdr + ti->length) < ti->length)
++    {
++      ti->err_string = "header+length would overflow";
++      return gpg_error (GPG_ERR_EOVERFLOW);
++    }
++
+   /* Without this kludge some example certs can't be parsed */
+   if (ti->class == CLASS_UNIVERSAL && !ti->tag)
+     ti->length = 0;
+-- 
+2.27.0
+
diff --git a/libksba.spec b/libksba.spec
index a2eb9f2..d7deec8 100644
--- a/libksba.spec
+++ b/libksba.spec
@@ -1,12 +1,14 @@
 Name:     libksba
 Version:  1.6.0
-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-CVE-2022-3515-Detect-a-possible-overflow-directly-in-the-TLV-parse.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
+* Wed Oct 19 2022 yixiangzhike <yixiangzhike007@163.com> - 1.6.0-2
+- Type:cve
+- ID:CVE-2022-3515
+- SUG:NA
+- DESC:fix CVE-2022-3515
+
 * Thu Dec 30 2021 yixiangzhike <yixiangzhike007@163.com> - 1.6.0-1
 - Type:enhancement
 - ID:NA