diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b0e830eaa..2bea439c4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -44,6 +44,12 @@ jobs:
       run: |
         VERSION=${GITHUB_REF#refs/tags/}
         VERSION=${VERSION#v}
+        # Validate the grammar up front, so a non-semver tag fails here with a clear
+        # message (the same grammar the Linux, Windows and macOS builders enforce).
+        if ! echo "$VERSION" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?$'; then
+          echo "derived version '$VERSION' is not X.Y.Z[-suffix]; tag a semver release" >&2
+          exit 1
+        fi
         echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
 
     - name: Download Artifacts
@@ -60,11 +66,17 @@ jobs:
         done
         echo "EOF" >> $GITHUB_OUTPUT
 
+    # Note: the version and the hashes are passed through environment variables
+    # instead of direct ${{ }} interpolation into the run block, so that a crafted
+    # tag/ref/input cannot inject shell into the step.
     - name: Generate Release Body
       id: generate_body
+      env:
+        VERSION: ${{ steps.get_version.outputs.VERSION }}
+        HASHES: ${{ steps.generate_hashes.outputs.HASHES }}
       run: |
         echo "BODY<<EOF" >> $GITHUB_OUTPUT
-        echo "Release version ${{ steps.get_version.outputs.VERSION }}" >> $GITHUB_OUTPUT
+        echo "Release version $VERSION" >> $GITHUB_OUTPUT
         echo "" >> $GITHUB_OUTPUT
         echo "Please download the appropriate package for your system." >> $GITHUB_OUTPUT
         echo "" >> $GITHUB_OUTPUT
@@ -74,7 +86,7 @@ jobs:
         echo "" >> $GITHUB_OUTPUT
         echo "File Hashes (SHA256):" >> $GITHUB_OUTPUT
         echo "\`\`\`" >> $GITHUB_OUTPUT
-        echo "${{ steps.generate_hashes.outputs.HASHES }}" >> $GITHUB_OUTPUT
+        echo "$HASHES" >> $GITHUB_OUTPUT
         echo "\`\`\`" >> $GITHUB_OUTPUT
         echo "EOF" >> $GITHUB_OUTPUT
 
diff --git a/.github/workflows/release_docker.yml b/.github/workflows/release_docker.yml
index c52fdd4fa..f7406653a 100644
--- a/.github/workflows/release_docker.yml
+++ b/.github/workflows/release_docker.yml
@@ -35,15 +35,29 @@ jobs:
       id: version
       run: |
         if [[ $GITHUB_REF == refs/tags/* ]]; then
-          echo "VERSION=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+          VERSION=${GITHUB_REF#refs/tags/}
+          # Validate the grammar up front (the version flows into docker build/push
+          # command lines inside build.py), so a non-semver tag fails here with a
+          # clear message. The leading 'v' is allowed here; build.py strips it.
+          if ! echo "$VERSION" | grep -Eq '^v?[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?$'; then
+            echo "derived version '$VERSION' is not [v]X.Y.Z[-suffix]; tag a semver release" >&2
+            exit 1
+          fi
+          echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
         else
           echo "VERSION=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
         fi
 
+    # Note: the version (and the Docker Hub username) are passed through environment
+    # variables instead of direct ${{ }} interpolation into the run block, so that a
+    # crafted tag/ref/input cannot inject shell into the step.
     - name: Build and Push Docker images
+      env:
+        VERSION: ${{ steps.version.outputs.VERSION }}
+        DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
       run: |
-        python build-tools/docker/build.py --push --docker-hub-user ${{ secrets.DOCKERHUB_USERNAME }} \
-          --version ${{ steps.version.outputs.VERSION }} --latest
+        python build-tools/docker/build.py --push --docker-hub-user "$DOCKERHUB_USERNAME" \
+          --version "$VERSION" --latest
 
     env:
       DOCKER_BUILDKIT: 1
diff --git a/.github/workflows/release_macos.yml b/.github/workflows/release_macos.yml
index e4adb1aa4..177bfe63a 100644
--- a/.github/workflows/release_macos.yml
+++ b/.github/workflows/release_macos.yml
@@ -23,6 +23,13 @@ jobs:
       run: |
         VERSION=${GITHUB_REF#refs/tags/}
         VERSION=${VERSION#v}
+        # Validate the grammar up front, so a non-semver tag fails here with a clear
+        # message instead of reaching the signing step (the same grammar the Linux and
+        # Windows builders enforce).
+        if ! echo "$VERSION" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+(-[0-9A-Za-z.-]+)?$'; then
+          echo "derived version '$VERSION' is not X.Y.Z[-suffix]; tag a semver release" >&2
+          exit 1
+        fi
         echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
         echo "Version extracted: $VERSION"
 
@@ -36,6 +43,9 @@ jobs:
       run: |
         cargo build --release --locked --target ${{ matrix.arch }}-apple-darwin --features trezor,ledger
 
+    # Note: the version (and the workflow input) are passed through environment
+    # variables instead of direct ${{ }} interpolation into the run blocks, so
+    # that a crafted tag/ref/input cannot inject shell into the steps.
     - name: Sign and Notarize GUI
       env:
         MACOS_CERTIFICATE_BASE64: ${{ secrets.MACOS_CERTIFICATE }}
@@ -46,16 +56,19 @@ jobs:
         APPLE_ID_PASSWORD: ${{ secrets.APPLE_ID_PASSWORD }}
         VERSION: ${{ steps.get_version.outputs.VERSION }}
       run: |
-        ./build-tools/osx/sign_and_notarize.sh ${{ matrix.arch }} ${{ steps.get_version.outputs.VERSION }}
+        ./build-tools/osx/sign_and_notarize.sh ${{ matrix.arch }} "$VERSION"
 
     - name: Package Mintlayer Node (without GUI)
+      env:
+        VERSION: ${{ steps.get_version.outputs.VERSION }}
+        BINARY_LIST: ${{ inputs.binary_list }}
       run: |
-        mkdir -p Mintlayer_Node_macos_${{ steps.get_version.outputs.VERSION }}_${{ matrix.arch }}
-        IFS=',' read -ra BINARIES <<< "${{ inputs.binary_list }}"
+        mkdir -p "Mintlayer_Node_macos_${VERSION}_${{ matrix.arch }}"
+        IFS=',' read -ra BINARIES <<< "$BINARY_LIST"
         for binary in "${BINARIES[@]}"; do
-          cp target/${{ matrix.arch }}-apple-darwin/release/$binary Mintlayer_Node_macos_${{ steps.get_version.outputs.VERSION }}_${{ matrix.arch }}/
+          cp "target/${{ matrix.arch }}-apple-darwin/release/$binary" "Mintlayer_Node_macos_${VERSION}_${{ matrix.arch }}/"
         done
-        zip -r Mintlayer_Node_macos_${{ steps.get_version.outputs.VERSION }}_${{ matrix.arch }}.zip Mintlayer_Node_macos_${{ steps.get_version.outputs.VERSION }}_${{ matrix.arch }}
+        zip -r "Mintlayer_Node_macos_${VERSION}_${{ matrix.arch }}.zip" "Mintlayer_Node_macos_${VERSION}_${{ matrix.arch }}"
 
     - name: Upload DMG Artifact (GUI)
       uses: actions/upload-artifact@v4