diff --git a/.github/workflows/cicd.yml b/.github/workflows/cicd.yml
index 0d2008f1..b0c4c193 100644
--- a/.github/workflows/cicd.yml
+++ b/.github/workflows/cicd.yml
@@ -1,34 +1,61 @@
 name: CI/CD Pipeline
 
+# CI/CD workflow for building, publishing, mirroring, signing container images and building release binaries.
+# Actions are pinned to specific SHAs to reduce supply-chain risk. This workflow triggers on tag push events.
+
+permissions:
+  contents: read
+  packages: write      # for GHCR push
+  id-token: write      # for Cosign Keyless (OIDC) Signing
+
+# Required secrets:
+# - DOCKER_HUB_USERNAME / DOCKER_HUB_ACCESS_TOKEN: push to Docker Hub
+# - GITHUB_TOKEN: used for GHCR login and OIDC keyless signing
+# - COSIGN_PRIVATE_KEY / COSIGN_PASSWORD / COSIGN_PUBLIC_KEY: for key-based signing
+
 on:
     push:
         tags:
             - "[0-9]+.[0-9]+.[0-9]+"
 
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
     release:
         name: Build and Release
         runs-on: amd64-runner
+        # Job-level timeout to avoid runaway or stuck runs
+        timeout-minutes: 120
+        env:
+          # Target images
+          DOCKERHUB_IMAGE: docker.io/${{ secrets.DOCKER_HUB_USERNAME }}/${{ github.event.repository.name }}
+          GHCR_IMAGE: ghcr.io/${{ github.repository_owner }}/${{ github.event.repository.name }}
 
         steps:
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+            - name: Set up QEMU
+              uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392 # v3.6.0
 
             - name: Set up Docker Buildx
-              uses: docker/setup-buildx-action@v3
+              uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
 
             - name: Log in to Docker Hub
-              uses: docker/login-action@v3
+              uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
               with:
+                  registry: docker.io
                   username: ${{ secrets.DOCKER_HUB_USERNAME }}
                   password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
-
             - name: Extract tag name
               id: get-tag
               run: echo "TAG=${GITHUB_REF#refs/tags/}" >> $GITHUB_ENV
+              shell: bash
 
             - name: Install Go
-              uses: actions/setup-go@v6
+              uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
               with:
                   go-version: 1.24
 
@@ -37,18 +64,21 @@ jobs:
                   TAG=${{ env.TAG }}
                   sed -i "s/export const APP_VERSION = \".*\";/export const APP_VERSION = \"$TAG\";/" server/lib/consts.ts
                   cat server/lib/consts.ts
+              shell: bash
 
             - name: Pull latest Gerbil version
               id: get-gerbil-tag
               run: |
                   LATEST_TAG=$(curl -s https://api.github.com/repos/fosrl/gerbil/tags | jq -r '.[0].name')
                   echo "LATEST_GERBIL_TAG=$LATEST_TAG" >> $GITHUB_ENV
+              shell: bash
 
             - name: Pull latest Badger version
               id: get-badger-tag
               run: |
                   LATEST_TAG=$(curl -s https://api.github.com/repos/fosrl/badger/tags | jq -r '.[0].name')
                   echo "LATEST_BADGER_TAG=$LATEST_TAG" >> $GITHUB_ENV
+              shell: bash
 
             - name: Update install/main.go
               run: |
@@ -60,6 +90,7 @@ jobs:
                   sed -i "s/config.BadgerVersion = \".*\"/config.BadgerVersion = \"$BADGER_VERSION\"/" install/main.go
                   echo "Updated install/main.go with Pangolin version $PANGOLIN_VERSION, Gerbil version $GERBIL_VERSION, and Badger version $BADGER_VERSION"
                   cat install/main.go
+              shell: bash
 
             - name: Build installer
               working-directory: install
@@ -67,12 +98,84 @@ jobs:
                   make go-build-release 
 
             - name: Upload artifacts from /install/bin
-              uses: actions/upload-artifact@v4
+              uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
               with:
                   name: install-bin
                   path: install/bin/
 
-            - name: Build and push Docker images
+            - name: Build and push Docker images (Docker Hub)
               run: |
                   TAG=${{ env.TAG }}
                   make build-release tag=$TAG
+                  echo "Built & pushed to: ${{ env.DOCKERHUB_IMAGE }}:${TAG}"
+              shell: bash
+
+            - name: Login in to GHCR
+              uses: docker/login-action@5e57cd118135c172c3672efd75eb46360885c0ef # v3.6.0
+              with:
+                  registry: ghcr.io
+                  username: ${{ github.actor }}
+                  password: ${{ secrets.GITHUB_TOKEN }}
+
+            - name: Install skopeo + jq
+              # skopeo: copy/inspect images between registries
+              # jq: JSON parsing tool used to extract digest values
+              run: |
+                  sudo apt-get update -y
+                  sudo apt-get install -y skopeo jq
+                  skopeo --version
+              shell: bash
+
+            - name: Copy tag from Docker Hub to GHCR
+              # Mirror the already-built image (all architectures) to GHCR so we can sign it
+              run: |
+                  set -euo pipefail
+                  TAG=${{ env.TAG }}
+                  echo "Copying ${{ env.DOCKERHUB_IMAGE }}:${TAG} -> ${{ env.GHCR_IMAGE }}:${TAG}"
+                  skopeo copy --all --retry-times 3 \
+                    docker://$DOCKERHUB_IMAGE:$TAG \
+                    docker://$GHCR_IMAGE:$TAG
+              shell: bash
+
+            - name: Install cosign
+              # cosign is used to sign and verify container images (key and keyless)
+              uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad # v4.0.0
+
+            - name: Dual-sign and verify (GHCR & Docker Hub)
+              # Sign each image by digest using keyless (OIDC) and key-based signing,
+              # then verify both the public key signature and the keyless OIDC signature.
+              env:
+                  TAG: ${{ env.TAG }}
+                  COSIGN_PRIVATE_KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}
+                  COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
+                  COSIGN_PUBLIC_KEY: ${{ secrets.COSIGN_PUBLIC_KEY }}
+                  COSIGN_YES: "true"
+              run: |
+                  set -euo pipefail
+
+                  issuer="https://token.actions.githubusercontent.com"
+                  id_regex="^https://github.com/${{ github.repository }}/.+"  # accept this repo (all workflows/refs)
+
+                  for IMAGE in "${GHCR_IMAGE}" "${DOCKERHUB_IMAGE}"; do
+                    echo "Processing ${IMAGE}:${TAG}"
+
+                    DIGEST="$(skopeo inspect --retry-times 3 docker://${IMAGE}:${TAG} | jq -r '.Digest')"
+                    REF="${IMAGE}@${DIGEST}"
+                    echo "Resolved digest: ${REF}"
+
+                    echo "==> cosign sign (keyless) --recursive ${REF}"
+                    cosign sign --recursive "${REF}"
+
+                    echo "==> cosign sign (key) --recursive ${REF}"
+                    cosign sign --key env://COSIGN_PRIVATE_KEY --recursive "${REF}"
+
+                    echo "==> cosign verify (public key) ${REF}"
+                    cosign verify --key env://COSIGN_PUBLIC_KEY "${REF}" -o text
+
+                    echo "==> cosign verify (keyless policy) ${REF}"
+                    cosign verify \
+                      --certificate-oidc-issuer "${issuer}" \
+                      --certificate-identity-regexp "${id_regex}" \
+                      "${REF}" -o text
+                  done
+              shell: bash
diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
index 1a01f1c4..15474255 100644
--- a/.github/workflows/linting.yml
+++ b/.github/workflows/linting.yml
@@ -1,5 +1,8 @@
 name: ESLint
 
+permissions:
+  contents: read
+
 on:
     pull_request:
         paths:
@@ -15,13 +18,13 @@ on:
 
 jobs:
     Linter:
-        runs-on: ubuntu-latest
+        runs-on: amd64-runner
         steps:
             - name: Checkout code
-              uses: actions/checkout@v5
+              uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
             - name: Set up Node.js
-              uses: actions/setup-node@v5
+              uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
               with:
                 node-version: '22'
 
@@ -32,4 +35,4 @@ jobs:
               run: npm run set:oss
 
             - name: Run ESLint
-              run: npx eslint . --ext .js,.jsx,.ts,.tsx
\ No newline at end of file
+              run: npx eslint . --ext .js,.jsx,.ts,.tsx
diff --git a/.github/workflows/stale-bot.yml b/.github/workflows/stale-bot.yml
index 4a574d91..5b6889da 100644
--- a/.github/workflows/stale-bot.yml
+++ b/.github/workflows/stale-bot.yml
@@ -14,7 +14,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@v10
+      - uses: actions/stale@5f858e3efba33a5ca4407a664cc011ad407f2008 # v10.1.0
         with:
           days-before-stale: 14
           days-before-close: 14
@@ -34,4 +34,4 @@ jobs:
           operations-per-run: 100
           remove-stale-when-updated: true
           delete-branch: false
-          enable-statistics: true
\ No newline at end of file
+          enable-statistics: true
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3d121f68..c40689bc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,8 @@
 name: Run Tests
 
+permissions:
+  contents: read
+
 on:
   pull_request:
     branches:
@@ -8,12 +11,12 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: amd64-runner
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
 
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
         with:
           node-version: '22'