diff --git a/bind.spec b/bind.spec
index 9f3ad2533e625cc76f17351e607ce33a0fe72bd4..e21b5e075008d87c46216544f8236a27ddbac947 100644
--- a/bind.spec
+++ b/bind.spec
@@ -30,7 +30,7 @@ Summary:  The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv
 Name:     bind
 License:  MPLv2.0
 Version:  9.16.23
-Release:  26
+Release:  27
 Epoch:    32
 Url:      https://www.isc.org/downloads/bind/
 #
@@ -255,6 +255,7 @@ Patch6171:backport-CVE-2024-1737-records-test2.patch
 Patch6172:backport-fix-build-failure-for-bind-dyndb-ldap.patch
 
 Patch9000:bugfix-limit-numbers-of-test-threads.patch
+Patch9001:ensure-proper-64-bit-aligment-in-quantize.patch
 
 %{?systemd_ordering}
 Requires:       coreutils
@@ -1262,6 +1263,12 @@ fi;
 %endif
 
 %changelog
+* Wed Jul 23 2025 jiangheng <jiangheng14@huawei.com> - 32:9.16.23-27
+- Type:bugfix
+- CVE:NA
+- SUG:NA
+- DESC:ensure proper 64-bit alignment in quantize()
+
 * Tue May 20 2025 xinghe <xinghe2@h-partners.com> - 32:9.16.23-26
 - Type:bugfix
 - CVE:NA
diff --git a/ensure-proper-64-bit-aligment-in-quantize.patch b/ensure-proper-64-bit-aligment-in-quantize.patch
new file mode 100644
index 0000000000000000000000000000000000000000..3b8d3ac1ce9bb058f72058ed9befd0b50c036159
--- /dev/null
+++ b/ensure-proper-64-bit-aligment-in-quantize.patch
@@ -0,0 +1,28 @@
+From b27c9c596064dd1931e3cf193533c4d506b176c4 Mon Sep 17 00:00:00 2001
+From: jiangheng <jiangheng14@huawei.com>
+Date: Wed, 23 Jul 2025 16:54:27 +0800
+Subject: [PATCH] ensure proper 64-bit alignment in quantize()
+
+Changed ALIGNMENT_SIZE from 8 to (size_t)8 to prevent potential
+truncation when calculating alignment masks. The original implementation
+could result in incorrect alignment when size is 64-bit due to implicit
+32-bit integer operations with the mask.
+---
+ lib/isc/mem.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/isc/mem.c b/lib/isc/mem.c
+index f84d300..541cf24 100644
+--- a/lib/isc/mem.c
++++ b/lib/isc/mem.c
+@@ -58,7 +58,7 @@ LIBISC_EXTERNAL_DATA unsigned int isc_mem_defaultflags = ISC_MEMFLAG_DEFAULT;
+
+ #define DEF_MAX_SIZE	  1100
+ #define DEF_MEM_TARGET	  4096
+-#define ALIGNMENT_SIZE	  8U /*%< must be a power of 2 */
++#define ALIGNMENT_SIZE	  (size_t)8U /*%< must be a power of 2 */
+ #define NUM_BASIC_BLOCKS  64 /*%< must be > 1 */
+ #define TABLE_INCREMENT	  1024
+ #define DEBUG_TABLE_COUNT 512U
+--
+2.33.0