diff --git a/meta-oe/recipes-support/hdf5/files/CVE-2026-19025.patch b/meta-oe/recipes-support/hdf5/files/CVE-2026-19025.patch
new file mode 100644
index 0000000000..075bcf7653
--- /dev/null
+++ b/meta-oe/recipes-support/hdf5/files/CVE-2026-19025.patch
@@ -0,0 +1,112 @@
+From 0cb26cd769d1da3f2ad2c3836dc1732309f935a7 Mon Sep 17 00:00:00 2001
+From: Matt L <124107509+mattjala@users.noreply.github.com>
+Date: Fri, 28 Aug 2026 13:49:02 -0500
+Subject: [PATCH] Fix CVE-2026-19025 (Reject chunked datasets with mismatched
+ chunk/dspace rank at open time) (#6508)
+
+* Reject chunked datasets with mismatched chunk/dspace rank
+
+H5D__chunk_construct() validates that the chunk layout dimensionality
+matches the dataspace rank, but that runs only at dataset creation time.
+When an existing dataset is opened, H5D__chunk_init() didn't repeat the
+check, so a file whose stored chunk rank disagreed with its dataspace rank
+was accepted. During chunk I/O the memory-selection rank (from the
+dataspace) and the file-selection rank (chunk ndims - 1) then differ, which
+produces a zero stride that causes a divide-by-zero in
+H5S__hyper_iter_get_seq_list().
+
+H5D__chunk_init() now performs the same dimensionality check on open (the
+stored chunk rank includes the extra element-size dimension, so it must be
+exactly one greater than the dataspace rank) and rejects a mismatch with an
+error.
+
+Added test_chunk_dims_mismatch() as a regression test in test/dsets.c
+
+Fixes #6491
+
+* Fix typo
+
+Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
+
+* Clarify element-vs-byte wording
+
+* Validate chunk/dataspace rank at layout decode time
+
+Move the stored-chunk-rank vs dataspace-rank consistency check out of
+H5D__chunk_init() and into H5O__layout_decode(), so a malformed chunked
+layout is rejected as the message is decoded (mirroring the fill/datatype
+size check in the fill message decode).
+
+* Update release_docs/CHANGELOG.md
+
+Co-authored-by: Larry Knox <lrknox@hdfgroup.org>
+
+* Update CHANGELOG
+
+* Pin format version bounds in bad chunk layout generator
+
+---------
+
+Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
+Co-authored-by: Larry Knox <lrknox@hdfgroup.org>
+
+CVE: CVE-2026-19025
+Upstream-Status: Backport [https://github.com/HDFGroup/hdf5/commit/b7b85e7abf9aa9b1dd9693523defa35217684eb2]
+
+Dropped changes to the test and CHANGELOG file.
+
+Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
+---
+ src/H5Olayout.c                   |  32 ++++++
+ 1 file changed, 32 insertions(+)
+
+diff --git a/src/H5Olayout.c b/src/H5Olayout.c
+index d230feb992..5dce35e916 100644
+--- a/src/H5Olayout.c
++++ b/src/H5Olayout.c
+@@ -23,6 +23,7 @@
+ #include "H5FLprivate.h" /* Free Lists                               */
+ #include "H5MMprivate.h" /* Memory management                        */
+ #include "H5Opkg.h"      /* Object headers                           */
++#include "H5Sprivate.h"  /* Dataspaces                               */
+ 
+ /* Local macros */
+ 
+@@ -561,6 +562,37 @@ H5O__layout_decode(H5F_t *f, H5O_t H5_ATTR_UNUSED *open_oh, unsigned H5_ATTR_UNU
+         }
+     }
+ 
++    /* For a chunked layout, the stored dimensionality includes an extra
++     * element-size dimension, so it must be exactly one greater than the
++     * dataspace rank.  Validate that here
++     * to reject malformed files before the inconsistent
++     * ranks can cause problems during chunk I/O.
++     */
++    if (mesg->type == H5D_CHUNKED && open_oh != NULL) {
++        htri_t space_exists; /* Whether the dataspace message exists */
++
++        if ((space_exists = H5O_msg_exists_oh(open_oh, H5O_SDSPACE_ID)) < 0)
++            HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, NULL, "can't check for dataspace message");
++        if (space_exists) {
++            H5S_extent_t *extent; /* Dataspace extent from the sibling message */
++            int           rank;   /* Dataspace rank */
++
++            if (NULL == (extent = (H5S_extent_t *)H5O_msg_read_oh(f, open_oh, H5O_SDSPACE_ID, NULL)))
++                HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, NULL, "can't read dataspace message");
++
++            rank = H5S_extent_get_dims(extent, NULL, NULL);
++
++            /* Done with the sibling dataspace message */
++            H5O_msg_free(H5O_SDSPACE_ID, extent);
++
++            if (rank < 0)
++                HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, NULL, "can't get dataspace rank");
++            if (mesg->u.chunk.ndims != (unsigned)rank + 1)
++                HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, NULL,
++                            "dimensionality of chunks doesn't match the dataspace");
++        }
++    }
++
+     /* Set return value */
+     ret_value = mesg;
+ 
\ No newline at end of file
diff --git a/meta-oe/recipes-support/hdf5/hdf5_2.0.0.bb b/meta-oe/recipes-support/hdf5/hdf5_2.0.0.bb
index 8b5b842fa0..cf199375d3 100644
--- a/meta-oe/recipes-support/hdf5/hdf5_2.0.0.bb
+++ b/meta-oe/recipes-support/hdf5/hdf5_2.0.0.bb
@@ -21,6 +21,7 @@ SRC_URI = "https://support.hdfgroup.org/releases/hdf5/v2_0/v2_0_0/downloads/${BP
            file://CVE-2026-17572.patch \
            file://CVE-2026-17573.patch \
            file://CVE-2026-17574.patch \
+           file://CVE-2026-19025.patch \
            "
 SRC_URI[sha256sum] = "f4c2edc5668fb846627182708dbe1e16c60c467e63177a75b0b9f12c19d7efed"