diff --git a/.github/workflows/create-release.yml b/.github/workflows/create-release.yml
index f5bd3fda5..4bead5286 100644
--- a/.github/workflows/create-release.yml
+++ b/.github/workflows/create-release.yml
@@ -9,6 +9,10 @@ on:
         description: 'Version number (e.g., 4.30.0)'
         required: true
         type: string
+      expected_source_sha:
+        description: 'Exact 40-character commit SHA admitted for this release'
+        required: true
+        type: string
       release_notes:
         description: 'Release notes (markdown)'
         required: true
@@ -108,6 +112,22 @@ jobs:
       visual_capture_count: ${{ steps.visual_plan.outputs.capture_count }}
       visual_comparison_tag: ${{ steps.visual_plan.outputs.comparison_tag }}
     steps:
+      - name: Verify admitted source commit
+        env:
+          EXPECTED_SOURCE_SHA: ${{ inputs.expected_source_sha }}
+        run: |
+          set -euo pipefail
+          if [[ ! "${EXPECTED_SOURCE_SHA}" =~ ^[0-9a-f]{40}$ ]]; then
+            echo "::error::expected_source_sha must be an exact 40-character commit SHA"
+            exit 1
+          fi
+          if [[ "${GITHUB_SHA}" != "${EXPECTED_SOURCE_SHA}" || \
+                "${GITHUB_WORKFLOW_SHA}" != "${EXPECTED_SOURCE_SHA}" ]]; then
+            echo "::error::Release dispatch expected ${EXPECTED_SOURCE_SHA}, but GitHub resolved source ${GITHUB_SHA} and workflow ${GITHUB_WORKFLOW_SHA}."
+            exit 1
+          fi
+          echo "[OK] Release dispatch is bound to ${EXPECTED_SOURCE_SHA}"
+
       - name: Checkout repository
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
diff --git a/docs/release-control/v6/internal/subsystems/deployment-installability.md b/docs/release-control/v6/internal/subsystems/deployment-installability.md
index 49525a70b..b6e71af38 100644
--- a/docs/release-control/v6/internal/subsystems/deployment-installability.md
+++ b/docs/release-control/v6/internal/subsystems/deployment-installability.md
@@ -2168,6 +2168,13 @@ artifact-selection behaviour.
    trigger, promotion resolver, rendered release body, current upgrade guide,
    or current release packet that routes systemd/LXC rollback through the
    Unified Agent installer, and must retain explicit Docker image guidance.
+17. Bind every publishing release dispatch to the exact commit admitted by the
+   caller. `.github/workflows/create-release.yml` must require a full
+   40-character `expected_source_sha` and, before checkout, reject the run
+   unless both `GITHUB_SHA` and `GITHUB_WORKFLOW_SHA` equal that commit.
+   `scripts/trigger-release.sh` and `scripts/trigger-stable-patch.sh` must send
+   the exact remote candidate SHA they already verified; branch ancestry or a
+   later branch tip is not equivalent release admission.
 
 ## Current State
 
diff --git a/scripts/installtests/build_release_assets_test.go b/scripts/installtests/build_release_assets_test.go
index 521db80c8..f72ce74a9 100644
--- a/scripts/installtests/build_release_assets_test.go
+++ b/scripts/installtests/build_release_assets_test.go
@@ -933,6 +933,10 @@ func TestCreateReleaseUploadsPowerShellInstaller(t *testing.T) {
 	convergenceWorkflow := string(convergenceContent)
 	required := []string{
 		`historical_asset_backfill_only:`,
+		`expected_source_sha:`,
+		`EXPECTED_SOURCE_SHA: ${{ inputs.expected_source_sha }}`,
+		`"${GITHUB_SHA}" != "${EXPECTED_SOURCE_SHA}"`,
+		`"${GITHUB_WORKFLOW_SHA}" != "${EXPECTED_SOURCE_SHA}"`,
 		`description: 'Repair an already-published release packet in place without rebuilding binaries'`,
 		`SYFT_VERSION="1.42.4"`,
 		`SYFT_ARCHIVE="syft_${SYFT_VERSION}_linux_amd64.tar.gz"`,
diff --git a/scripts/release_control/release_promotion_policy_test.py b/scripts/release_control/release_promotion_policy_test.py
index 8899c3918..216cc4598 100644
--- a/scripts/release_control/release_promotion_policy_test.py
+++ b/scripts/release_control/release_promotion_policy_test.py
@@ -1595,6 +1595,31 @@ class ReleasePromotionPolicyTest(unittest.TestCase):
         self.assertIn("did not produce a valid promotion metadata envelope", workflow)
         self.assertIn("Do not use this artifact to clear", workflow)
 
+    def test_release_dispatch_rejects_source_or_workflow_drift_before_checkout(self) -> None:
+        workflow = yaml.safe_load(read(".github/workflows/create-release.yml"))
+        steps = workflow["jobs"]["prepare"]["steps"]
+        self.assertEqual(steps[0]["name"], "Verify admitted source commit")
+        self.assertIn("actions/checkout@", steps[1]["uses"])
+        expected = "a" * 40
+        other = "b" * 40
+        for admitted, source, workflow_sha, succeeds in (
+            (expected, expected, expected, True),
+            (expected, other, expected, False),
+            (expected, expected, other, False),
+            (expected, other, other, False),
+            ("", expected, expected, False),
+            ("main", expected, expected, False),
+            ("a" * 39, expected, expected, False),
+        ):
+            with self.subTest(admitted=admitted, source=source, workflow=workflow_sha):
+                result = subprocess.run(
+                    ["bash", "-c", steps[0]["run"]],
+                    env={"PATH": os.defpath, "EXPECTED_SOURCE_SHA": admitted,
+                         "GITHUB_SHA": source, "GITHUB_WORKFLOW_SHA": workflow_sha},
+                    capture_output=True, text=True, check=False,
+                )
+                self.assertEqual(result.returncode == 0, succeeds, result.stdout + result.stderr)
+
     def test_release_workflow_enforces_rc_lineage_soak_and_v5_notice(self) -> None:
         content = read(".github/workflows/create-release.yml")
         update_demo_workflow = read(".github/workflows/update-demo-server.yml")
@@ -1694,6 +1719,10 @@ class ReleasePromotionPolicyTest(unittest.TestCase):
         self.assertIn("build_rollback_section", renderer)
         self.assertIn("promotion metadata out of customer notes", renderer)
         self.assertIn("historical_asset_backfill_only:", content)
+        self.assertIn("expected_source_sha:", content)
+        self.assertIn('EXPECTED_SOURCE_SHA: ${{ inputs.expected_source_sha }}', content)
+        self.assertIn('"${GITHUB_SHA}" != "${EXPECTED_SOURCE_SHA}"', content)
+        self.assertIn('"${GITHUB_WORKFLOW_SHA}" != "${EXPECTED_SOURCE_SHA}"', content)
         self.assertIn("Repair an already-published release packet in place without rebuilding binaries", content)
         self.assertIn("draft: true", content)
         self.assertIn("activate_release:", content)
diff --git a/scripts/trigger-release.sh b/scripts/trigger-release.sh
index 0d6acd7f4..79a901e79 100755
--- a/scripts/trigger-release.sh
+++ b/scripts/trigger-release.sh
@@ -120,6 +120,7 @@ python3 scripts/check-workflow-dispatch-inputs.py \
   --workflow-path .github/workflows/create-release.yml \
   --branch "$CURRENT_BRANCH" \
   --require version \
+  --require expected_source_sha \
   --require release_notes \
   --require release_screenshot_plan \
   --require promoted_from_tag \
@@ -372,6 +373,7 @@ echo "Triggering release workflow..."
 if [ -n "$NOTES_FILE" ]; then
   jq -n \
     --arg version "$VERSION" \
+    --arg expected_source_sha "$LOCAL" \
     --rawfile release_notes "$NOTES_FILE" \
     --rawfile release_screenshot_plan "$VISUAL_PLAN_FILE" \
     --arg rollback_version "$ROLLBACK_VERSION" \
@@ -387,6 +389,7 @@ if [ -n "$NOTES_FILE" ]; then
     --arg mobile_release_evidence "$MOBILE_RELEASE_EVIDENCE" \
     '{
       version: $version,
+      expected_source_sha: $expected_source_sha,
       release_notes: $release_notes,
       release_screenshot_plan: $release_screenshot_plan,
       rollback_version: $rollback_version,
diff --git a/scripts/trigger-stable-patch.sh b/scripts/trigger-stable-patch.sh
index c4f759894..efe146cd8 100755
--- a/scripts/trigger-stable-patch.sh
+++ b/scripts/trigger-stable-patch.sh
@@ -203,6 +203,7 @@ else
     --workflow-path .github/workflows/create-release.yml \
     --branch "$CURRENT_BRANCH" \
     --require version \
+    --require expected_source_sha \
     --require release_notes \
     --require release_screenshot_plan \
     --require promoted_from_tag \
@@ -219,6 +220,7 @@ else
 
   jq -n \
     --arg version "$VERSION" \
+    --arg expected_source_sha "$LOCAL_SHA" \
     --rawfile release_notes "$NOTES_FILE" \
     --rawfile release_screenshot_plan "$VISUAL_PLAN_FILE" \
     --arg promoted_from_tag "" \
@@ -234,6 +236,7 @@ else
     --arg mobile_release_evidence "$MOBILE_RELEASE_EVIDENCE" \
     '{
       version: $version,
+      expected_source_sha: $expected_source_sha,
       release_notes: $release_notes,
       release_screenshot_plan: $release_screenshot_plan,
       promoted_from_tag: $promoted_from_tag,