diff --git a/.github/workflows/cicd-main.yml b/.github/workflows/cicd-main.yml
index ff39b026c1b..fcfe98c8edb 100644
--- a/.github/workflows/cicd-main.yml
+++ b/.github/workflows/cicd-main.yml
@@ -359,6 +359,26 @@ jobs:
         if: startsWith(github.ref, 'refs/heads/pull-request/') && github.event_name == 'push'
         uses: nv-gha-runners/get-pr-info@main
 
+      - name: Validate updated golden values
+        if: github.event_name == 'merge_group' || (startsWith(github.ref, 'refs/heads/pull-request/') && github.event_name == 'push')
+        env:
+          BASE_REF: ${{ github.event.merge_group.base_ref || fromJSON(steps.get-pr-info.outputs.pr-info || '{}').base.ref }}
+        run: |
+          BASE_REF="${BASE_REF#refs/heads/}"
+          git fetch origin "$BASE_REF"
+          mapfile -t GOLDEN_VALUES_FILES < <(
+            git diff --name-only --diff-filter=ACMR \
+              --merge-base "origin/$BASE_REF" -- \
+              ':(glob)tests/functional_tests/test_cases/**/golden_values*.json'
+          )
+
+          if (( ${#GOLDEN_VALUES_FILES[@]} == 0 )); then
+            echo "No golden value files were updated; skipping validation."
+            exit 0
+          fi
+
+          python3 tools/check_golden_values.py "${GOLDEN_VALUES_FILES[@]}"
+
       - name: Run linting
         if: startsWith(github.ref, 'refs/heads/pull-request/') && github.event_name == 'push'
         run: |
diff --git a/tools/check_golden_values.py b/tools/check_golden_values.py
new file mode 100644
index 00000000000..270786f496f
--- /dev/null
+++ b/tools/check_golden_values.py
@@ -0,0 +1,82 @@
+# Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+
+"""Check golden-value JSON files for NaN and infinity values."""
+
+import argparse
+import json
+import logging
+from collections.abc import Iterator
+from pathlib import Path
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+NOT_ACCEPTED_VALUES = [
+    "nan",
+    "+nan",
+    "-nan",
+    "inf",
+    "+inf",
+    "-inf",
+    "infinity",
+    "+infinity",
+    "-infinity",
+]
+
+
+def _find_non_finite_values(value: Any, location: str = "$") -> Iterator[tuple[str, Any]]:
+    if isinstance(value, dict):
+        for key, child in value.items():
+            yield from _find_non_finite_values(child, f"{location}[{key!r}]")
+    elif isinstance(value, list):
+        for index, child in enumerate(value):
+            yield from _find_non_finite_values(child, f"{location}[{index}]")
+    elif str(value).strip().lower() in NOT_ACCEPTED_VALUES:
+        yield location, value
+
+
+def _format_failures(failures: list[tuple[str, Any]], limit: int = 20) -> str:
+    lines = [f"  {location} = {value!r}" for location, value in failures[:limit]]
+    if len(failures) > limit:
+        lines.append(f"  ... and {len(failures) - limit} more")
+    return "\n".join(lines)
+
+
+def _parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description="Fail if any golden-value JSON file contains NaN or infinity."
+    )
+    parser.add_argument("files", nargs="+", type=Path, help="Golden-value JSON files to check.")
+    return parser.parse_args()
+
+
+def main() -> int:
+    """Check the requested golden-value files and return a process exit code."""
+    failed = False
+    files = _parse_args().files
+
+    for golden_value_file in files:
+        try:
+            with golden_value_file.open() as file:
+                golden_values = json.load(file)
+        except (OSError, json.JSONDecodeError) as error:
+            logger.error("Could not read %s: %s", golden_value_file, error)
+            failed = True
+            continue
+
+        failures = list(_find_non_finite_values(golden_values))
+        if failures:
+            logger.error(
+                "Found non-finite values in %s:\n%s", golden_value_file, _format_failures(failures)
+            )
+            failed = True
+
+    if not failed:
+        logger.info("Checked %d golden-value file(s); all values are finite.", len(files))
+
+    return int(failed)
+
+
+if __name__ == "__main__":
+    logging.basicConfig(level=logging.INFO, format="%(message)s")
+    raise SystemExit(main())