diff --git a/backport-CVE-2025-8851.patch b/backport-CVE-2025-8851.patch
new file mode 100644
index 0000000000000000000000000000000000000000..62112c9438ca4597cbdcc680aaa75626e2fa7480
--- /dev/null
+++ b/backport-CVE-2025-8851.patch
@@ -0,0 +1,69 @@
+From 8a7a48d7a645992ca83062b3a1873c951661e2b3 Mon Sep 17 00:00:00 2001
+From: Lee Howard <faxguy@howardsilvan.com>
+Date: Sun, 11 Aug 2024 16:01:07 +0000
+Subject: [PATCH] Attempt to address tiffcrop Coverity scan issues 1605444,
+ 1605445, and 1605449.
+
+Reference:https://gitlab.com/libtiff/libtiff/-/commit/8a7a48d7a645992ca83062b3a1873c951661e2b3
+Conflict:Adapt context
+---
+ tools/tiffcrop.c | 17 ++++++++++++-----
+ 1 file changed, 12 insertions(+), 5 deletions(-)
+
+diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
+index bef95cb..6ae12e8 100644
+--- a/tools/tiffcrop.c
++++ b/tools/tiffcrop.c
+@@ -5029,7 +5029,14 @@ static int readSeparateStripsIntoBuffer (TIFF *in, uint8_t *obuf, uint32_t lengt
+       buff = srcbuffs[s];
+       strip = (s * strips_per_sample) + j; 
+       bytes_read = TIFFReadEncodedStrip (in, strip, buff, stripsize);
+-      rows_this_strip = (uint32_t)(bytes_read / src_rowsize);
++      if (bytes_read < 0)
++      {
++          rows_this_strip = 0;
++      }
++      else
++      {
++          rows_this_strip = (uint32_t)(bytes_read / src_rowsize);
++      }
+       if (bytes_read < 0 && !ignore)
+         {
+         TIFFError(TIFFFileName(in),
+@@ -5440,14 +5447,14 @@ computeInputPixelOffsets(struct crop_mask *crop, struct image_data *image,
+       rmargin = _TIFFClampDoubleToUInt32(crop->margins[3] * scale * xres);
+       }
+ 
+-    if ((lmargin + rmargin) > image->width)
++    if (lmargin == 0xFFFFFFFFU || rmargin == 0xFFFFFFFFU || (lmargin + rmargin) > image->width)
+       {
+       TIFFError("computeInputPixelOffsets", "Combined left and right margins exceed image width");
+       lmargin = (uint32_t) 0;
+       rmargin = (uint32_t) 0;
+       return (-1);
+       }
+-    if ((tmargin + bmargin) > image->length)
++    if (tmargin == 0xFFFFFFFFU || bmargin == 0xFFFFFFFFU || (tmargin + bmargin) > image->length)
+       {
+       TIFFError("computeInputPixelOffsets", "Combined top and bottom margins exceed image length"); 
+       tmargin = (uint32_t) 0;
+@@ -5947,14 +5954,14 @@ computeOutputPixelOffsets (struct crop_mask *crop, struct image_data *image,
+       vmargin = _TIFFClampDoubleToUInt32(page->vmargin * scale * ((image->bps + 7) / 8));
+       }
+ 
+-    if ((hmargin * 2.0) > (pwidth * page->hres))
++    if (hmargin == 0xFFFFFFFFU || (hmargin * 2.0) > (pwidth * page->hres))
+       {
+       TIFFError("computeOutputPixelOffsets", 
+                 "Combined left and right margins exceed page width");
+       hmargin = (uint32_t) 0;
+       return (-1);
+       }
+-    if ((vmargin * 2.0) > (plength * page->vres))
++    if (vmargin == 0xFFFFFFFFU || (vmargin * 2.0) > (plength * page->vres))
+       {
+       TIFFError("computeOutputPixelOffsets", 
+                 "Combined top and bottom margins exceed page length"); 
+-- 
+2.33.0
+
diff --git a/libtiff.spec b/libtiff.spec
index 4f7e89ae56811503c31c53db695a30dd7be67675..600235a1ccfa88039f03a74d7ab30e4f23554794 100644
--- a/libtiff.spec
+++ b/libtiff.spec
@@ -1,6 +1,6 @@
 Name:           libtiff
 Version:        4.3.0
-Release:        27
+Release:        28
 Summary:        TIFF Library and Utilities
 License:        libtiff
 URL:            https://www.simplesystems.org/libtiff/
@@ -57,6 +57,7 @@ Patch6047:      backport-CVE-2025-8177.patch
 Patch6048:      backport-CVE-2024-13978.patch
 Patch6049:      backport-0001-CVE-2025-8534.patch
 Patch6050:      backport-0002-CVE-2025-8534.patch
+Patch6051:      backport-CVE-2025-8851.patch
 
 Patch9000:      fix-raw2tiff-floating-point-exception.patch
 
@@ -159,6 +160,9 @@ find html -name 'Makefile*' | xargs rm
 %exclude %{_datadir}/html/man/tiffgt.1.html
 
 %changelog
+* Tue Aug 12 2025 lingsheng <lingsheng1@h-partners.com> - 4.3.0-28
+- fix CVE-2025-8851
+
 * Thu Aug 07 2025 lingsheng <lingsheng1@h-partners.com> - 4.3.0-27
 - fix CVE-2025-8534