diff --git a/.github/scripts/check-image-policies.sh b/.github/scripts/check-image-policies.sh
index 3ef1b35..7edeade 100644
--- a/.github/scripts/check-image-policies.sh
+++ b/.github/scripts/check-image-policies.sh
@@ -19,15 +19,15 @@ run_scan() {
 for tool in HELM KUBECTL; do
     docker run --rm --entrypoint /usr/bin/cat "$image" "/licenses/$tool-PACKAGES.txt" > "dist/$tool-PACKAGES.txt"
     test -s "dist/$tool-PACKAGES.txt"
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' "dist/$tool-PACKAGES.txt"
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' "dist/$tool-PACKAGES.txt"; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi
 done
 for tool in DOCKER BUILDX TRIVY; do
     docker run --rm --entrypoint /usr/bin/cat "$DAPPER_IMAGE" "/licenses/$tool-PACKAGES.txt" > "dist/$tool-PACKAGES.txt"
     test -s "dist/$tool-PACKAGES.txt"
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' "dist/$tool-PACKAGES.txt"
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' "dist/$tool-PACKAGES.txt"; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi
 done
 
-for binary in helm kubectl; do
+for binary in helm kubectl kubectl-service; do
     jq -e --arg binary "$binary" 'any(.Results[]?;
       .Type == "gobinary" and (.Target | split("/") | last) == $binary
       and (.Packages | length > 0))' dist/kubectl-service.security-raw.json >/dev/null
diff --git a/.github/scripts/test_negative_package_guards.py b/.github/scripts/test_negative_package_guards.py
new file mode 100644
index 0000000..ec208a9
--- /dev/null
+++ b/.github/scripts/test_negative_package_guards.py
@@ -0,0 +1,46 @@
+"""Exercise the actual shell guards, including commands after a rejected match."""
+import pathlib
+import re
+import subprocess
+import tempfile
+import unittest
+
+ROOT = pathlib.Path(__file__).resolve().parents[2]
+
+
+class NegativePackageGuards(unittest.TestCase):
+    def test_all_package_guards_fail_before_the_next_command(self):
+        count = 0
+        for relative in ('Dockerfile.dapper', 'package/Dockerfile',
+                         '.github/scripts/check-image-policies.sh'):
+            lines = (ROOT / relative).read_text().splitlines()
+            self.assertFalse(any(re.search(r'^\s*! grep', line) for line in lines))
+            for line in lines:
+                if 'if grep' not in line:
+                    continue
+                count += 1
+                command = line.strip().removesuffix('\\').strip().rstrip(';')
+                command = re.sub(r'(/(?:licenses|out|tmp)/[^; ]+|"dist/\$tool-PACKAGES.txt")',
+                                 '"$fixture"', command)
+                forbidden = ('dep\tgithub.com/docker/docker\tv1\n'
+                             if 'build metadata' in command else
+                             'github.com/docker/docker/client\n'
+                             if 'upstream Docker dependency' in command else
+                             'golang.org/x/crypto/openpgp/packet\n')
+                with tempfile.TemporaryDirectory() as temp:
+                    fixture = pathlib.Path(temp) / 'packages.txt'
+                    for contents, expected in ((forbidden, 1), ('fmt\n', 0)):
+                        fixture.write_text(contents)
+                        result = subprocess.run(['bash', '-c',
+                            'set -euo pipefail; fixture="$1"; ' + command +
+                            '; echo NEXT_COMMAND', 'guard-test', str(fixture)],
+                            capture_output=True, text=True)
+                        self.assertEqual(result.returncode, expected, result.stderr)
+                        self.assertEqual('NEXT_COMMAND' in result.stdout, expected == 0)
+                        if expected:
+                            self.assertIn('Forbidden', result.stderr)
+        self.assertEqual(count, 9)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index ef04d7d..fb86b4e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -47,6 +47,7 @@ jobs:
           test "$(git rev-list -n 1 "$RELEASE_TAG")" = "$(git rev-parse HEAD)"
           test -z "$(git status --porcelain)"
           python3 .github/scripts/test_runtime_vulnerability_policy.py
+          python3 .github/scripts/test_negative_package_guards.py
 
       - name: Build verification environment and vulnerability database
         shell: bash
@@ -116,6 +117,7 @@ jobs:
             dist/dapper.raw.json dist/dapper.effective.json dist/dapper.cdx.json \
             dist/dapper-policy.json dist/dapper.accepted-build-header-findings.json \
             dist/runtime-openvex.json dist/*-PACKAGES.txt \
+            dist/dapper-ubuntu-apt-packages.tsv dist/ubuntu-apt.lock dist/ubuntu-security-packages.lock \
             dist/SHA256SUMS
 
       - name: Clean run-owned resources
diff --git a/.github/workflows/security-release-gate.yml b/.github/workflows/security-release-gate.yml
index 4b030a9..42b6b37 100644
--- a/.github/workflows/security-release-gate.yml
+++ b/.github/workflows/security-release-gate.yml
@@ -42,6 +42,7 @@ jobs:
           docker version
           docker buildx version
           python3 .github/scripts/test_runtime_vulnerability_policy.py
+          python3 .github/scripts/test_negative_package_guards.py
 
       - name: Build the checksum-locked verification environment
         shell: bash
diff --git a/Dockerfile.dapper b/Dockerfile.dapper
index da6923c..bafb335 100644
--- a/Dockerfile.dapper
+++ b/Dockerfile.dapper
@@ -138,7 +138,7 @@ RUN set -eux; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=https://proxy.golang.org GOSUMDB=sum.golang.org GOMODCACHE=/tmp/docker-go-mod go list -deps ./cmd/docker > /tmp/docker-resolved-packages.txt; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/docker-go-mod go mod verify; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/docker-go-mod go list -deps ./cmd/docker > /licenses/DOCKER-PACKAGES.txt; \
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /licenses/DOCKER-PACKAGES.txt; \
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /licenses/DOCKER-PACKAGES.txt; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi; \
     docker_build_time="$(date -u --date="@${DOCKER_SOURCE_DATE_EPOCH}" +'%Y-%m-%dT%H:%M:%SZ')"; \
     SOURCE_DATE_EPOCH="${DOCKER_SOURCE_DATE_EPOCH}" CGO_ENABLED=0 GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/docker-go-mod GOOS=linux GOARCH="${DAPPER_HOST_ARCH}" \
         go build -trimpath -buildvcs=false -tags 'grpcnotrace osusergo netgo' \
@@ -180,8 +180,8 @@ RUN set -eux; \
     test "$(GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/buildx-go-mod go list -m -f '{{.Version}}' golang.org/x/mod)" = "${BUILDX_X_MOD_VERSION}"; \
     test "$(GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/buildx-go-mod go list -m -f '{{.Version}}' google.golang.org/grpc)" = "${BUILDX_GRPC_VERSION}"; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/buildx-go-mod go list -deps ./cmd/buildx > /tmp/buildx-deps.txt; \
-    ! grep '^github.com/docker/docker/' /tmp/buildx-deps.txt; \
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /tmp/buildx-deps.txt; \
+    if grep '^github.com/docker/docker/' /tmp/buildx-deps.txt; then echo 'Forbidden upstream Docker dependency' >&2; exit 1; fi; \
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /tmp/buildx-deps.txt; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi; \
     cp /tmp/buildx-deps.txt /licenses/BUILDX-PACKAGES.txt; \
     SOURCE_DATE_EPOCH="${BUILDX_SOURCE_DATE_EPOCH}" CGO_ENABLED=0 GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/buildx-go-mod GOOS=linux GOARCH="${DAPPER_HOST_ARCH}" \
         go build -trimpath -buildvcs=false \
@@ -191,7 +191,7 @@ RUN set -eux; \
     docker buildx version | grep -F "github.com/docker/buildx v${BUILDX_VERSION} ${BUILDX_GIT_COMMIT}"; \
     go version -m /usr/libexec/docker/cli-plugins/docker-buildx > /licenses/BUILDX-GO-VERSION.txt; \
     test "$(awk 'NR == 1 { print $NF }' /licenses/BUILDX-GO-VERSION.txt)" = "go${GO_VERSION}"; \
-    ! grep -F $'dep\tgithub.com/docker/docker\t' /licenses/BUILDX-GO-VERSION.txt; \
+    if grep -F $'dep\tgithub.com/docker/docker\t' /licenses/BUILDX-GO-VERSION.txt; then echo 'Forbidden upstream Docker build metadata' >&2; exit 1; fi; \
     grep -F $'dep\tgithub.com/moby/go-archive\t'"${BUILDX_GO_ARCHIVE_VERSION}"$'\t' /licenses/BUILDX-GO-VERSION.txt; \
     grep -F $'dep\tgolang.org/x/mod\t'"${BUILDX_X_MOD_VERSION}"$'\t' /licenses/BUILDX-GO-VERSION.txt; \
     grep -F $'dep\tgoogle.golang.org/grpc\t'"${BUILDX_GRPC_VERSION}"$'\t' /licenses/BUILDX-GO-VERSION.txt; \
@@ -232,7 +232,7 @@ RUN set -eux; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=https://proxy.golang.org GOSUMDB=sum.golang.org GOMODCACHE=/tmp/trivy-go-mod go list -deps ./cmd/trivy > /tmp/trivy-resolved-packages.txt; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/trivy-go-mod go mod verify; \
     GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/trivy-go-mod go list -deps ./cmd/trivy > /licenses/TRIVY-PACKAGES.txt; \
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /licenses/TRIVY-PACKAGES.txt; \
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /licenses/TRIVY-PACKAGES.txt; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi; \
     SOURCE_DATE_EPOCH="${TRIVY_SOURCE_DATE_EPOCH}" CGO_ENABLED=0 GOEXPERIMENT=jsonv2 GOFLAGS=-mod=mod GOWORK=off GOPROXY=off GOSUMDB=sum.golang.org GOMODCACHE=/tmp/trivy-go-mod GOOS=linux GOARCH="${DAPPER_HOST_ARCH}" \
         go build -trimpath -buildvcs=false \
         -ldflags "-s -w -buildid= -X=github.com/aquasecurity/trivy/pkg/version/app.ver=${TRIVY_VERSION}" \
diff --git a/README.md b/README.md
index 59932e3..db55bce 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,9 @@ non-root read-only smoke run, a client-side Helm render, full-severity Trivy
 reports, and a CycloneDX SBOM. Release gates reject all available fixes,
 unreviewed findings, and High/Critical findings. Only exact Low/Medium entries
 with official no-fix evidence may remain. The sole OpenVEX statement covers
-the absent OpenPGP package; source dependency graphs enforce that boundary.
+the absent OpenPGP package; source dependency graphs enforce that boundary
+with fail-closed checks. Raw scans must include package inventories for the
+service executable, Helm, kubectl, and each bundled Go build tool.
 
 See [COMPATIBILITY.md](COMPATIBILITY.md), [SECURITY.md](SECURITY.md), and
 [ORIGIN.md](ORIGIN.md).
diff --git a/package/Dockerfile b/package/Dockerfile
index 013f9a5..0f6f32b 100644
--- a/package/Dockerfile
+++ b/package/Dockerfile
@@ -35,7 +35,7 @@ RUN set -eux; \
     go get "golang.org/x/net@v${HELM_X_NET_VERSION}" "golang.org/x/crypto@v${HELM_X_CRYPTO_VERSION}"; \
     go mod verify; \
     go list -deps ./cmd/helm > /out/HELM-PACKAGES.txt; \
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /out/HELM-PACKAGES.txt; \
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /out/HELM-PACKAGES.txt; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi; \
     test "$(go list -m -f '{{.Version}}' oras.land/oras-go/v2)" = "v${HELM_ORAS_GO_VERSION}"; \
     test "$(go list -m -f '{{.Version}}' golang.org/x/crypto)" = "v${HELM_X_CRYPTO_VERSION}"; \
     test "$(go list -m -f '{{.Version}}' golang.org/x/net)" = "v${HELM_X_NET_VERSION}"; \
@@ -82,7 +82,7 @@ RUN set -eux; \
     GOWORK=off go mod vendor; \
     test "$(GOWORK=off go list -m -f '{{.Version}}' golang.org/x/net)" = "${KUBERNETES_X_NET_VERSION}"; \
     GOWORK=off go list -deps ./cmd/kubectl > /out/KUBECTL-PACKAGES.txt; \
-    ! grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /out/KUBECTL-PACKAGES.txt; \
+    if grep -Eq '^golang.org/x/crypto/openpgp(/|$)' /out/KUBECTL-PACKAGES.txt; then echo 'Forbidden OpenPGP dependency' >&2; exit 1; fi; \
     GOWORK=off GO_VERSION=1.27.3 FORCE_HOST_GO=1 KUBE_BUILD_PLATFORMS=linux/amd64 \
         KUBE_GIT_VERSION="${KUBERNETES_VERSION}" KUBE_GIT_COMMIT="${KUBERNETES_GIT_COMMIT}" \
         KUBE_GIT_TREE_STATE=clean KUBE_GIT_MAJOR=1 KUBE_GIT_MINOR=36 \