diff --git a/ci/scripts/hermes_webui_release.py b/ci/scripts/hermes_webui_release.py
index 1a744508..be1ac8d3 100755
--- a/ci/scripts/hermes_webui_release.py
+++ b/ci/scripts/hermes_webui_release.py
@@ -17,6 +17,7 @@ from hermes_webui_flux_release import (
     DEFAULT_IMAGE as DEFAULT_IMAGE,
     DESTINATION_PATTERN,
     DIGEST_PATTERN,
+    REVISION_PATTERN,
     render_workload as render_workload,
     validate_destination,
     validate_release_artifacts as validate_flux_release_artifacts,
@@ -232,13 +233,17 @@ def assert_tag_absent(
 def verify_registry_digest(
     destination: str,
     digest: str,
+    source_revision: str,
     *,
     username: str,
     password: str,
     opener: Callable[[urllib.request.Request, int], Any] = _registry_request,
 ) -> None:
-    """Verify Harbor independently resolves the pushed tag to Kaniko's digest."""
+    """Verify Harbor resolves the tag, digest, and persisted source revision."""
     digest = _validated(digest, DIGEST_PATTERN, "image digest")
+    source_revision = _validated(
+        source_revision, REVISION_PATTERN, "source revision"
+    )
     status, body = _artifact_response(
         destination, username=username, password=password, opener=opener
     )
@@ -263,6 +268,11 @@ def verify_registry_digest(
         raise RuntimeError("Harbor artifact does not contain the expected tag")
     if matching_tags[0].get("immutable") is not True:
         raise RuntimeError("Harbor did not enforce the expected tag as immutable")
+    labels = ((artifact.get("extra_attrs") or {}).get("config") or {}).get("Labels")
+    if not isinstance(labels, dict):
+        raise RuntimeError("Harbor artifact omitted OCI image labels")
+    if labels.get("org.opencontainers.image.revision") != source_revision:
+        raise RuntimeError("Harbor OCI source-revision label does not match")
 
 
 def validate_release_artifacts(
@@ -356,7 +366,11 @@ def main() -> int:
         destination=args.destination,
     )
     verify_registry_digest(
-        args.destination, digest, username=username, password=password
+        args.destination,
+        digest,
+        args.source_revision,
+        username=username,
+        password=password,
     )
     write_release_artifacts(
         digest=digest,
diff --git a/testing/tests/test_hermes_webui_release.py b/testing/tests/test_hermes_webui_release.py
index e9fb0765..3e77d118 100644
--- a/testing/tests/test_hermes_webui_release.py
+++ b/testing/tests/test_hermes_webui_release.py
@@ -232,12 +232,24 @@ def test_release_verifies_exact_webui_harbor_artifact_and_policy() -> None:
                 {
                     "digest": digest,
                     "tags": [{"name": f"git-{revision}-build-9", "immutable": True}],
+                    "extra_attrs": {
+                        "config": {
+                            "Labels": {
+                                "org.opencontainers.image.revision": revision,
+                            }
+                        }
+                    },
                 }
             ).encode()
         )
 
     module.verify_registry_digest(
-        destination, digest, username="robot", password="private", opener=artifact_open
+        destination,
+        digest,
+        revision,
+        username="robot",
+        password="private",
+        opener=artifact_open,
     )
     request = seen[0][0]
     assert "/repositories/hermes-webui/artifacts/" in request.full_url
@@ -283,6 +295,37 @@ def test_release_verifies_exact_webui_harbor_artifact_and_policy() -> None:
     )
 
 
+@pytest.mark.parametrize("labels", [None, {}, {"org.opencontainers.image.revision": "c" * 40}])
+def test_release_rejects_missing_or_wrong_harbor_source_revision(labels) -> None:
+    """A tag derived from Git cannot substitute for the persisted OCI label."""
+    module = _load(RELEASE, f"webui_registry_revision_{labels!r}")
+    revision = "a" * 40
+    destination = f"{module.DEFAULT_IMAGE}:git-{revision}-build-9"
+    digest = "sha256:" + "b" * 64
+
+    def artifact_open(_request, _timeout):
+        config = {} if labels is None else {"Labels": labels}
+        return _Response(
+            json.dumps(
+                {
+                    "digest": digest,
+                    "tags": [{"name": f"git-{revision}-build-9", "immutable": True}],
+                    "extra_attrs": {"config": config},
+                }
+            ).encode()
+        )
+
+    with pytest.raises(RuntimeError, match="OCI (image labels|source-revision label)"):
+        module.verify_registry_digest(
+            destination,
+            digest,
+            revision,
+            username="robot",
+            password="private",
+            opener=artifact_open,
+        )
+
+
 def test_flux_tracks_webui_policy_before_jenkins() -> None:
     """The immutable Harbor rule is reviewed desired state, not a pipeline wish."""
     harbor = yaml.safe_load(