diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..baad1b2
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,55 @@
+name: CodeQL
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    # Weekly Monday 09:30 ET (13:30 UTC, no DST drift worth caring about for a
+    # weekly cadence). Catches CVEs that land in CodeQL's queries between
+    # commits when the repo is otherwise quiet.
+    - cron: '30 13 * * 1'
+
+permissions:
+  contents: read
+  security-events: write
+  actions: read
+
+jobs:
+  analyze:
+    name: Analyze (java)
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: '17'
+
+      - uses: actions/cache@v5
+        with:
+          path: ~/.m2/repository
+          key: maven-codeql-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            maven-codeql-
+
+      - uses: github/codeql-action/init@v4
+        with:
+          languages: java-kotlin
+          # security-and-quality includes the security-extended pack plus
+          # maintainability/reliability queries — fine for a small library.
+          queries: security-and-quality
+
+      # Manual build: skip tests + spotless/license to keep CodeQL extraction
+      # focused on compilable bytecode. The full verify matrix in ci.yml owns
+      # those checks.
+      - name: Compile
+        run: mvn -B -ntp -DskipTests -Dspotless.check.skip=true -Dlicense.skip=true package
+
+      - uses: github/codeql-action/analyze@v4
+        with:
+          category: /language:java-kotlin
diff --git a/.github/workflows/dependency-check.yml b/.github/workflows/dependency-check.yml
new file mode 100644
index 0000000..cf08ec5
--- /dev/null
+++ b/.github/workflows/dependency-check.yml
@@ -0,0 +1,81 @@
+name: Dependency-Check
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  schedule:
+    # Weekly Tuesday 09:30 ET (13:30 UTC). Offset from CodeQL's Monday cron so
+    # a slow NVD API morning doesn't pile both onto the same hour.
+    - cron: '30 13 * * 2'
+
+permissions:
+  contents: read
+  security-events: write
+  actions: read
+
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: '17'
+
+      - uses: actions/cache@v5
+        with:
+          path: ~/.m2/repository
+          key: maven-depcheck-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            maven-depcheck-
+
+      # NVD data cache: pom.xml relocates the dependency-check dataDirectory
+      # to ~/.cache/dependency-check-data so this cache path is disjoint from
+      # the ~/.m2/repository cache above (overlapping paths cause redundant
+      # storage and unpredictable restores). Key on ISO year-week (`%G-%V`)
+      # so PR/push runs share one entry within the week; the weekly cron
+      # naturally rolls to a new key, refreshing the NVD feed.
+      - name: Compute weekly cache bucket
+        id: cachekey
+        run: echo "week=$(date -u +%G-%V)" >> "$GITHUB_OUTPUT"
+
+      - uses: actions/cache@v5
+        with:
+          path: ~/.cache/dependency-check-data
+          key: depcheck-nvd-${{ runner.os }}-${{ steps.cachekey.outputs.week }}
+          restore-keys: |
+            depcheck-nvd-${{ runner.os }}-
+
+      - name: Run dependency-check
+        run: |
+          mvn -B -ntp -P security \
+            -DskipTests=true \
+            -Dspotless.check.skip=true \
+            -Dlicense.skip=true \
+            ${NVD_API_KEY:+-DnvdApiKey=$NVD_API_KEY} \
+            verify
+        env:
+          # Optional: set NVD_API_KEY in repo secrets to lift NVD rate limits.
+          # Without it, the job still works but is slower on cold caches.
+          NVD_API_KEY: ${{ secrets.NVD_API_KEY }}
+
+      - name: Upload SARIF to GitHub Security tab
+        if: always()
+        uses: github/codeql-action/upload-sarif@v4
+        with:
+          sarif_file: target/dependency-check/dependency-check-report.sarif
+          category: dependency-check
+
+      - name: Upload HTML/JSON report
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: dependency-check-report
+          path: target/dependency-check/
+          retention-days: 14
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index bda5080..12bb2e6 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -76,6 +76,11 @@ jobs:
     needs: verify
     permissions:
       contents: write
+      # id-token + attestations needed by actions/attest-build-provenance and
+      # actions/attest-sbom — these mint sigstore-backed attestations against
+      # the GitHub OIDC token and write them to the repo's attestation log.
+      id-token: write
+      attestations: write
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
@@ -116,6 +121,69 @@ jobs:
           OSSRH_TOKEN: ${{ secrets.OSSRH_TOKEN }}
           MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}
 
+      # release:perform checks the tagged code into target/checkout/ and runs
+      # the central+sign profiles (see <releaseProfiles> in pom.xml). The
+      # cyclonedx plugin (bound to the central profile, package phase) drops
+      # bom.{json,xml} into each module's target/. Collect them under a
+      # versioned name so consumers downloading from the GH Release can tell
+      # which module/version the SBOM corresponds to.
+      - name: Collect release artifacts (JARs + SBOMs)
+        id: collect
+        run: |
+          set -euo pipefail
+          RELEASE_VERSION="${RELEASE_TAG#v}"
+          echo "RELEASE_VERSION=${RELEASE_VERSION}" >> "$GITHUB_ENV"
+          mkdir -p release-assets
+          missing=0
+          # SBOMs — one per module, both formats. ALL are required: a missing
+          # SBOM means the central profile didn't run cyclonedx (broken release
+          # config) and we'd rather fail here with a precise path than later
+          # when `gh release create` chokes on an unexpanded glob.
+          for module in magika-java magika-java-tika; do
+            for fmt in json xml; do
+              src="target/checkout/${module}/target/bom.${fmt}"
+              if [ -f "$src" ]; then
+                cp "$src" "release-assets/${module}-${RELEASE_VERSION}-cyclonedx.${fmt}"
+              else
+                echo "::error::Expected SBOM not found at $src — did the central profile run cyclonedx?"
+                missing=1
+              fi
+            done
+          done
+          # Main JARs (for build-provenance attestation; sources/javadoc skipped
+          # — attesting the primary artifact is what consumers verify against).
+          for module in magika-java magika-java-tika; do
+            jar="target/checkout/${module}/target/${module}-${RELEASE_VERSION}.jar"
+            if [ -f "$jar" ]; then
+              cp "$jar" "release-assets/"
+            else
+              echo "::error::Expected JAR not found at $jar"
+              missing=1
+            fi
+          done
+          if [ "$missing" -ne 0 ]; then
+            echo "::error::Required release artifacts are missing (see errors above); aborting before GitHub Release"
+            exit 1
+          fi
+          ls -la release-assets/
+
+      - name: Attest build provenance for JARs
+        uses: actions/attest-build-provenance@v3
+        with:
+          subject-path: 'release-assets/*.jar'
+
+      - name: Attest magika-java SBOM
+        uses: actions/attest-sbom@v3
+        with:
+          subject-path: 'release-assets/magika-java-${{ env.RELEASE_VERSION }}.jar'
+          sbom-path: 'release-assets/magika-java-${{ env.RELEASE_VERSION }}-cyclonedx.json'
+
+      - name: Attest magika-java-tika SBOM
+        uses: actions/attest-sbom@v3
+        with:
+          subject-path: 'release-assets/magika-java-tika-${{ env.RELEASE_VERSION }}.jar'
+          sbom-path: 'release-assets/magika-java-tika-${{ env.RELEASE_VERSION }}-cyclonedx.json'
+
       - name: Extract CHANGELOG section + create GitHub Release
         run: |
           RELEASE_VERSION="${RELEASE_TAG#v}"
@@ -168,10 +236,15 @@ jobs:
 
           # Use --notes-file (NOT --notes) — CHANGELOG content can contain markdown
           # that breaks shell-quoting if passed as a string.
+          # SBOMs are attached as release assets so consumers who don't pull from
+          # Maven Central (or who want the aggregate parent SBOM at a glance) can
+          # download them directly. JARs live on Central — no need to duplicate.
           gh release create "${RELEASE_TAG}" \
             --title "${RELEASE_TAG}" \
             --notes-file release-notes.md \
-            --latest
+            --latest \
+            release-assets/*-cyclonedx.json \
+            release-assets/*-cyclonedx.xml
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e21664..f0527fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `VerificationReason`.
 - Optional `dev.jcputney:magika-java-tika` artifact with an embedded-ONNX Apache Tika
   `Detector` adapter and service-loader registration.
+- GitHub CodeQL static analysis workflow (`.github/workflows/codeql.yml`) running on
+  push, pull request, and weekly cron with the `security-and-quality` query suite.
+- OWASP Dependency-Check SCA scan (`.github/workflows/dependency-check.yml`) running
+  on push, pull request, and weekly cron. Wired via a `security` Maven profile that
+  fails the build on CVSS ≥ 7 in runtime/compile scopes; SARIF report is uploaded to
+  the GitHub Security tab.
+- Release workflow now attaches per-module CycloneDX SBOMs (JSON + XML) to the GitHub
+  Release and generates Sigstore-backed `actions/attest-build-provenance` attestations
+  for the published JARs plus `actions/attest-sbom` attestations linking each SBOM to
+  its JAR.
 
 ### Changed
 
diff --git a/pom.xml b/pom.xml
index aa0d2fb..71ef370 100644
--- a/pom.xml
+++ b/pom.xml
@@ -73,6 +73,7 @@
         <version.plugin.release>3.3.1</version.plugin.release>
         <version.plugin.central-publishing>0.10.0</version.plugin.central-publishing>
         <version.plugin.cyclonedx>2.9.1</version.plugin.cyclonedx>
+        <version.plugin.dependency-check>12.1.0</version.plugin.dependency-check>
     </properties>
 
     <dependencyManagement>
@@ -344,6 +345,60 @@
                 </plugins>
             </build>
         </profile>
+        <profile>
+            <id>security</id>
+            <!-- OWASP Dependency-Check (SCA). Opt-in profile because the NVD feed
+                 download is heavy (~hundreds of MB) and slow to refresh. CI uses
+                 .github/workflows/dependency-check.yml; locally run:
+                   mvn -P security verify -DnvdApiKey=...
+                 Without an NVD API key the run still works but rate-limits hard. -->
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.owasp</groupId>
+                        <artifactId>dependency-check-maven</artifactId>
+                        <version>${version.plugin.dependency-check}</version>
+                        <!-- aggregate is a reactor-root goal; inheritance would
+                             cause each child module to invoke it during its own
+                             verify phase, which is redundant at best and can
+                             fail on the non-aggregator execution context. -->
+                        <inherited>false</inherited>
+                        <configuration>
+                            <!-- Fail build on High/Critical (CVSS >= 7.0). Mediums get
+                                 reported but don't block — keeps the gate signal/noise
+                                 reasonable for a small library. -->
+                            <failBuildOnCVSS>7</failBuildOnCVSS>
+                            <formats>
+                                <format>HTML</format>
+                                <format>SARIF</format>
+                                <format>JSON</format>
+                            </formats>
+                            <!-- Skip dev/test scopes — CVEs in junit/assertj/archunit
+                                 don't ship to consumers. -->
+                            <skipTestScope>true</skipTestScope>
+                            <skipProvidedScope>true</skipProvidedScope>
+                            <skipSystemScope>true</skipSystemScope>
+                            <!-- Aggregate report at parent level so the workflow has
+                                 one SARIF to upload. -->
+                            <outputDirectory>${project.build.directory}/dependency-check</outputDirectory>
+                            <!-- Move the NVD feed cache out of ~/.m2/repository so
+                                 the workflow can cache it on a separate (weekly) key
+                                 without overlapping the maven dependency cache. -->
+                            <dataDirectory>${user.home}/.cache/dependency-check-data</dataDirectory>
+                        </configuration>
+                        <executions>
+                            <execution>
+                                <id>dependency-check</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>aggregate</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
         <profile>
             <id>github</id>
             <distributionManagement>