diff --git a/.github/workflows/sast.yml b/.github/workflows/sast.yml
deleted file mode 100644
index e852d4b..0000000
--- a/.github/workflows/sast.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-name: SAST
-# MicroHealth's shared static analysis: Opengrep with MicroHealth's rules
-# (MicroHealthLLC/sast-rules). The pin below is moved by a pull request that
-# sast-rules opens on each release; merging it is how this repository takes
-# new rules.
-on:
-  schedule:
-    # Daily — 10:30 PM US Eastern (EDT) = 02:30 UTC the next day
-    - cron: "30 2 * * *"
-  workflow_dispatch:
-permissions:
-  contents: read
-jobs:
-  sast:
-    permissions: {contents: read, actions: read, security-events: write, id-token: write}
-    uses: MicroHealthLLC/sast-rules/.github/workflows/opengrep.yml@d7c3dad1ed1fe24d092f469360ca68d00a3a654d # v2026.10.0
-    with:
-      aws_region: ${{ vars.AWS_REGION_EAST_1 }}
-      s3_bucket: ${{ vars.SECURITY_REPORTS_S3_BUCKET }}
-    secrets: inherit
diff --git a/.github/workflows/security-scan.yml b/.github/workflows/security-scan.yml
new file mode 100644
index 0000000..7b7cb3a
--- /dev/null
+++ b/.github/workflows/security-scan.yml
@@ -0,0 +1,43 @@
+name: Security scan
+# MicroHealth's one security workflow (MicroHealthLLC/sast-rules,
+# security-scan.yml): SAST (Opengrep with MicroHealth's rules), Trivy
+# (dependencies, secrets, misconfiguration), the CycloneDX SBOM and ZAP DAST,
+# in parallel, ending in ONE report (the `security-report` artifact). Every
+# scanner is on; switch one off with its input (`sast: false`, `trivy: false`,
+# `sbom: false`, `zap: false`). It sits beside the Tests workflow (the release
+# gate, with its firmware CVE audit); it does not gate releases.
+#
+# The pin below is moved by a pull request that sast-rules opens on each
+# release; merging it is how this repository takes new rules and engines.
+# scripts/sast.sh reads the same pin, so a local scan runs the same rules.
+#
+# Needs: vars.AWS_REGION_EAST_1, secrets.AWS_ROLE (OIDC; pulls MicroHealth's
+# FIPS images from ECR, writes the bucket), vars.SECURITY_REPORTS_S3_BUCKET
+# (empty: reports stay artifacts only) and vars.ZAP_TARGET_URL (empty: ZAP is
+# recorded as not run, with the reason; the run does not fail). Only a full
+# scan of the default branch is uploaded; a pull request's stays an artifact.
+on:
+  push:
+    # main is the default branch (every push to it is a release): its full
+    # scans feed Tueri Core; integration's go under _branch-scans/.
+    branches: [main, integration]
+  pull_request:
+  schedule:
+    # Daily — 10:30 PM US Eastern (EDT) = 02:30 UTC the next day
+    - cron: "30 2 * * *"
+  workflow_dispatch:
+permissions:
+  contents: read
+concurrency:
+  group: security-scan-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  security:
+    permissions: {contents: read, actions: read, security-events: write, id-token: write}
+    uses: MicroHealthLLC/sast-rules/.github/workflows/security-scan.yml@341cd54bc0aae9359fa56965281d45ad58ce812c # v2026.10.5
+    with:
+      aws_region: ${{ vars.AWS_REGION_EAST_1 }}
+      s3_bucket: ${{ vars.SECURITY_REPORTS_S3_BUCKET }}
+      zap_target: ${{ vars.ZAP_TARGET_URL }}
+      baseline_ref: ${{ github.base_ref }}
+    secrets: inherit
diff --git a/AI_RULES.md b/AI_RULES.md
index 883f575..262863d 100644
--- a/AI_RULES.md
+++ b/AI_RULES.md
@@ -212,6 +212,13 @@ only while no SSH session is open; in a session they go to the server.
   unit-tests, persistence, build (both boards: RAM budget, zero compiler warnings in `main/`, no
   key material), audit (CVEs), network-surface (linked symbols, generated sdkconfig), secret-scan.
   The code-quality workflow stays advisory.
+- The **Security scan** workflow (`.github/workflows/security-scan.yml`) calls MicroHealth's
+  shared `security-scan.yml` (`MicroHealthLLC/sast-rules`, pinned by commit): SAST, Trivy,
+  SBOM and ZAP DAST, one report. Every scanner stays on (test/guards/test_supply_chain.py,
+  `SecurityScan`). Before pushing run `scripts/check.sh` (guards, host tests, then
+  `scripts/sast.sh` with the same rules); if SAST can't run locally, say so in the PR.
+  `scripts/sast.sh` is copied from sast-rules unchanged; never edit it. Suppress a finding
+  only inline, with the full rule id and why it does not apply.
 - Tests live in `test/`: `test/host` compiles hardware-independent firmware sources unchanged
   for Linux against in-memory stand-ins for NVS, partitions and logging (`idf_stubs/`,
   `fake_idf.cpp`); `test/guards` holds Python checks of the rules in this file. Keep logic that
diff --git a/README.md b/README.md
index 02d184a..3312ca7 100644
--- a/README.md
+++ b/README.md
@@ -222,5 +222,9 @@ charges its battery over USB-C while SimplrSSH runs.
 - Every push and pull request runs the **Tests** checks (`.github/workflows/tests.yml`). To run
   the unit tests on a PC (Linux, with `cmake`, `g++` and `libmbedtls-dev`):
   `cmake -S test/host -B build-host && cmake --build build-host && ctest --test-dir build-host`,
-  and `python3 -m unittest discover -s test/guards`.
+  and `python3 -m unittest discover -s test/guards`. `scripts/check.sh` runs both, then
+  `scripts/sast.sh` (MicroHealth's SAST rules; needs docker or nerdctl logged in to
+  MicroHealth's ECR; `SKIP_SAST=1` leaves it out).
+- The **Security scan** workflow (`.github/workflows/security-scan.yml`) runs SAST, Trivy, an
+  SBOM and ZAP DAST and writes one report; see [SECURITY.md](SECURITY.md).
 - Contributor rules are in [AI_RULES.md](AI_RULES.md).
diff --git a/SECURITY.md b/SECURITY.md
index 4e3bb00..1eb0f59 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -110,10 +110,27 @@ a release waits for it to pass on the same commit. Security-relevant gates:
   audit (esp-idf-sbom, NVD) of ESP-IDF, its libraries and the components of both images that
   blocks on new high/critical findings.
 
-Outside the Tests workflow, `.github/workflows/sast.yml` runs MicroHealth's shared static
-analysis nightly (and on demand): Opengrep with MicroHealth's rules
-(`MicroHealthLLC/sast-rules`, pinned by commit). It is report-only; findings go to GitHub code
-scanning and to MicroHealth's security reports.
+Outside the Tests workflow, `.github/workflows/security-scan.yml` runs MicroHealth's shared
+security scan (`MicroHealthLLC/sast-rules`, pinned by commit) on every push to `main` and
+`integration`, every pull request, nightly and on demand: SAST (Opengrep with MicroHealth's
+rules), Trivy (dependencies, secrets and misconfiguration in the repository), a CycloneDX SBOM
+and ZAP DAST, in parallel, ending in one `security-report` (each scanner's status and counts by
+severity). Every scanner is on. A scanner that was on and left no report fails the run; a count
+is shown only for a scanner that ran, so "did not run" never reads as "found nothing". It does
+not gate releases (the Tests workflow does), and findings are not a release blocker unless the
+Tests audit also reports them. SimplrSSH is firmware with no web endpoint, so ZAP has nothing
+to scan unless `ZAP_TARGET_URL` is set; until then the report shows ZAP as not run, with the
+reason. Trivy does not understand ESP-IDF component locks; the CVE audit above remains the
+check for the firmware's own components. SAST findings also go to GitHub code scanning.
+Only full scans of `main` feed MicroHealth's security reports: `integration`'s are kept apart
+and never ingested, and a pull request's stay run artifacts (SAST there reports only what is
+new against the base).
+
+The same SAST rules run locally: `scripts/sast.sh` (copied unchanged from
+`MicroHealthLLC/sast-rules`; it reads the workflow's pin) and `scripts/check.sh`, which runs the
+guard and host tests first. It needs docker or nerdctl logged in to MicroHealth's ECR. A
+suppression is inline, with the full rule id and the reason it does not apply:
+`// noopengrep: <rule-id> — <reason>`.
 
 Found while introducing these checks:
 
diff --git a/scripts/check.sh b/scripts/check.sh
new file mode 100755
index 0000000..7f03231
--- /dev/null
+++ b/scripts/check.sh
@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+# The local check before a push: the guard tests and the host unit tests the
+# Tests workflow runs, then SAST with MicroHealth's rules at the commit
+# .github/workflows/security-scan.yml pins (scripts/sast.sh) — the same rules
+# CI's security scan runs. It does not build firmware (that needs ESP-IDF).
+#
+#   scripts/check.sh                # guards, host tests (cmake, g++, libmbedtls-dev), SAST
+#   SKIP_SAST=1 scripts/check.sh    # without SAST (no docker/nerdctl or ECR login);
+#                                   # say so in the PR — CI's security scan still runs it
+#
+# SAST needs git, curl, python3, sha256sum and docker or nerdctl logged in to
+# MicroHealth's ECR (295669632222); it fails on an ERROR finding.
+set -euo pipefail
+cd "$(git rev-parse --show-toplevel)"
+(cd test/guards && python3 -m unittest test_supply_chain test_firmware_rules test_rules_file test_ci_scripts)
+cmake -S test/host -B build-host -DSTRICT=ON -DSANITIZE=ON
+cmake --build build-host -j "$(nproc)"
+ctest --test-dir build-host -L unit --output-on-failure
+if [[ "${SKIP_SAST:-}" == 1 ]]; then
+  echo "SAST SKIPPED (SKIP_SAST=1): not run locally; CI's security scan still runs it." >&2
+  exit 0
+fi
+scripts/sast.sh "$@"
diff --git a/scripts/sast.sh b/scripts/sast.sh
new file mode 100755
index 0000000..d2827bd
--- /dev/null
+++ b/scripts/sast.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Local SAST: MicroHealth's rules (MicroHealthLLC/sast-rules) at exactly the
+# commit this repository's CI pins, run the way CI runs them. Copied from
+# sast-rules/local/sast.sh; it reads the pin, so it never needs editing.
+#
+#   scripts/sast.sh [--fail-on error|warning|none] [--json out.json]
+#
+# Needs git, curl, python3, sha256sum and docker or nerdctl logged in to
+# MicroHealth's ECR.
+set -euo pipefail
+root="$(git rev-parse --show-toplevel)"
+pin="$(grep -rhoE 'MicroHealthLLC/sast-rules/\.github/workflows/[a-z-]+\.yml@[0-9a-f]{40}' \
+  "$root/.github/workflows" | head -1 | sed 's/.*@//')"
+[ -n "$pin" ] || { echo "No sast-rules pin in .github/workflows." >&2; exit 2; }
+cache="${XDG_CACHE_HOME:-$HOME/.cache}/sast-rules/${pin}"
+if [ ! -f "$cache/.complete" ]; then
+  rm -rf "$cache"; mkdir -p "$cache"
+  git -C "$cache" init -q
+  git -C "$cache" fetch -q --depth 1 https://github.com/MicroHealthLLC/sast-rules.git "$pin"
+  git -C "$cache" checkout -q FETCH_HEAD
+  [ "$(git -C "$cache" rev-parse HEAD)" = "$pin" ] || { echo "sast-rules fetch is not ${pin}" >&2; exit 1; }
+  touch "$cache/.complete"
+fi
+exec "$cache/scripts/scan-local.sh" "$@" "$root"
diff --git a/test/guards/test_supply_chain.py b/test/guards/test_supply_chain.py
index 756af16..2e0ebcd 100644
--- a/test/guards/test_supply_chain.py
+++ b/test/guards/test_supply_chain.py
@@ -4,6 +4,7 @@
 (dependencies.lock for the T-Deck, dependencies.lock.esp32p4 for the Tab5).
 """
 
+import os
 import re
 import unittest
 
@@ -159,5 +160,32 @@ def test_ci_idf_version_matches_manifest(self):
         self.assertTrue(idf.lstrip("~^=") == ci, f"manifest idf {idf} vs CI v{ci}")
 
 
+class SecurityScan(unittest.TestCase):
+    """One security workflow: MicroHealth's shared security-scan (SAST, Trivy, SBOM, ZAP DAST),
+    every scanner on, and the same rules locally through scripts/sast.sh."""
+
+    SHARED = re.compile(r"uses:\s*MicroHealthLLC/sast-rules/\.github/workflows/security-scan\.yml@([0-9a-f]{40})")
+
+    def test_one_security_scan_calls_the_shared_workflow(self):
+        text = repo.read(".github", "workflows", "security-scan.yml")
+        self.assertRegex(text, self.SHARED)
+        callers = [n for n, t in repo.workflows().items() if "MicroHealthLLC/sast-rules/" in t]
+        self.assertEqual(callers, [".github/workflows/security-scan.yml"],
+                         "SAST, Trivy, SBOM and ZAP run from the one security-scan workflow")
+
+    def test_every_scanner_on(self):
+        text = repo.read(".github", "workflows", "security-scan.yml")
+        for scanner in ("sast", "trivy", "sbom", "zap"):
+            with self.subTest(scanner=scanner):
+                self.assertNotRegex(text, rf"(?m)^\s*{scanner}:\s*false", "every scanner stays on")
+        self.assertIn("zap_target: ${{ vars.ZAP_TARGET_URL }}", text)
+
+    def test_local_sast_uses_the_pinned_rules(self):
+        sast = repo.path("scripts", "sast.sh")
+        self.assertTrue(os.access(sast, os.X_OK), "scripts/sast.sh must be executable")
+        self.assertIn("MicroHealthLLC/sast-rules", repo.read("scripts", "sast.sh"))
+        self.assertIn("scripts/sast.sh", repo.read("scripts", "check.sh"))
+
+
 if __name__ == "__main__":
     unittest.main()