diff --git a/Dockerfile.traefik b/Dockerfile.traefik
new file mode 100644
index 0000000..94009d5
--- /dev/null
+++ b/Dockerfile.traefik
@@ -0,0 +1,42 @@
+# syntax=docker/dockerfile:1.20.0
+
+FROM golang:1.26.5-alpine3.23@sha256:622e56dbc11a8cfe87cafa2331e9a201877271cbff918af53d3be315f3da88cc AS builder
+
+ARG TRAEFIK_VERSION=v3.7.8
+ARG TRAEFIK_SOURCE_SHA256=3a725c0ead27fa512756acd57056ec4652420a9daceaa6d9c170bfbb25bf51f9
+ARG TRAEFIK_BUILD_DATE=2026-07-15_12:51:10PM
+ARG GRPC_GO_VERSION=v1.82.1
+
+ADD --checksum=sha256:3a725c0ead27fa512756acd57056ec4652420a9daceaa6d9c170bfbb25bf51f9 \
+  https://github.com/traefik/traefik/releases/download/v3.7.8/traefik-v3.7.8.src.tar.gz \
+  /tmp/traefik.tar.gz
+
+WORKDIR /src
+
+RUN test "$TRAEFIK_SOURCE_SHA256" = "3a725c0ead27fa512756acd57056ec4652420a9daceaa6d9c170bfbb25bf51f9" \
+  && tar -xzf /tmp/traefik.tar.gz --strip-components=1 \
+  && go get "google.golang.org/grpc@${GRPC_GO_VERSION}" \
+  && test "$(go list -m -f '{{.Version}}' google.golang.org/grpc)" = "$GRPC_GO_VERSION" \
+  && CGO_ENABLED=0 go build \
+    -trimpath \
+    -ldflags "-s -w -X github.com/traefik/traefik/v3/pkg/version.Version=${TRAEFIK_VERSION}-wnh-grpc1.82.1 -X github.com/traefik/traefik/v3/pkg/version.BuildDate=${TRAEFIK_BUILD_DATE}" \
+    -installsuffix nocgo \
+    -o /out/traefik \
+    ./cmd/traefik
+
+FROM alpine:3.24.1@sha256:28bd5fe8b56d1bd048e5babf5b10710ebe0bae67db86916198a6eec434943f8b AS certificates
+
+RUN apk add --no-cache \
+  ca-certificates=20260611-r0 \
+  tzdata=2026c-r0
+
+FROM scratch
+
+COPY --from=certificates /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=certificates /usr/share/zoneinfo /usr/share/zoneinfo
+COPY --from=builder /out/traefik /traefik
+
+EXPOSE 80
+VOLUME ["/tmp"]
+
+ENTRYPOINT ["/traefik"]
diff --git a/README.md b/README.md
index d92081a..da87986 100644
--- a/README.md
+++ b/README.md
@@ -109,6 +109,10 @@ Open:
 Compose starts Traefik, PostGIS, Mailpit, a migration runner, 2 web replicas,
 and 2 Oban worker replicas. It waits for readiness and verifies a PubSub message
 broadcast from a different BEAM node. Registration emails appear in Mailpit.
+The Traefik image is reproducibly built from the checksum-pinned upstream
+`v3.7.8` source with `grpc-go 1.82.1`, because the latest upstream binary still
+contains `grpc-go 1.81.1` affected by
+[GHSA-hrxh-6v49-42gf](https://github.com/advisories/GHSA-hrxh-6v49-42gf).
 
 Four deployment settings in the ignored environment select the runtime without
 editing Compose files:
diff --git a/compose.yaml b/compose.yaml
index c4f1252..f6e0214 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -83,7 +83,10 @@ services:
     restart: unless-stopped
 
   proxy:
-    image: traefik:v3.7.8@sha256:4299bbed850421258fc5448c2e0e6ad350981d4d335a68de11b92448aedbefe5
+    image: who-need-help:traefik-v3.7.8-grpc1.82.1
+    build:
+      context: .
+      dockerfile: Dockerfile.traefik
     command:
       - --api.dashboard=false
       - --providers.docker=true
diff --git a/scripts/quality.sh b/scripts/quality.sh
index afaf590..65305ff 100755
--- a/scripts/quality.sh
+++ b/scripts/quality.sh
@@ -25,6 +25,7 @@ boundary_mock_image="who-need-help:boundary-mock-audit-$run_id"
 socket_proxy_image="who-need-help:socket-proxy-audit-$run_id"
 postgis_image="who-need-help:postgis-audit-$run_id"
 caddy_image="who-need-help:caddy-audit-$run_id"
+traefik_image="who-need-help:traefik-audit-$run_id"
 socket_proxy_container="wnh-socket-proxy-audit-$run_id"
 scan_dir=$(mktemp -d "${TMPDIR:-/tmp}/wnh-quality-scan.XXXXXX")
 scan_list="${scan_dir}.files"
@@ -45,7 +46,7 @@ cleanup() {
   docker image rm "$quality_image" "$assets_image" "$e2e_image" "$release_image" \
     "$backup_image" "$minio_image" "$mc_image" \
     "$boundary_mock_image" "$socket_proxy_image" "$postgis_image" \
-    "$caddy_image" \
+    "$caddy_image" "$traefik_image" \
     >/dev/null 2>&1 || true
   rm -rf "$scan_dir" "$scan_list" "$scan_tar"
 }
@@ -64,7 +65,7 @@ docker run --rm \
 
 echo "Checking Dockerfiles with Hadolint 2.14.0"
 for dockerfile in Dockerfile Dockerfile.backup Dockerfile.minio \
-  Dockerfile.postgis Dockerfile.socket-proxy \
+  Dockerfile.postgis Dockerfile.socket-proxy Dockerfile.traefik \
   android/Dockerfile e2e/Dockerfile ops/external-boundaries/Dockerfile; do
   docker run --rm --interactive "$HADOLINT_IMAGE" \
     hadolint --failure-threshold warning - <"$dockerfile"
@@ -612,10 +613,12 @@ echo "Building, smoke-testing, and scanning pinned runtime infrastructure images
 docker build --tag "$socket_proxy_image" --file Dockerfile.socket-proxy .
 docker build --tag "$postgis_image" --file Dockerfile.postgis .
 docker build --tag "$caddy_image" --file Dockerfile.caddy .
+docker build --tag "$traefik_image" --file Dockerfile.traefik .
 test "$(docker image inspect --format '{{.Config.User}}' "$socket_proxy_image")" = "haproxy"
 test "$(docker image inspect --format '{{.Config.User}}' "$postgis_image")" = "postgres"
 test "$(docker image inspect --format '{{.Config.User}}' "$caddy_image")" = "1000:1000"
 docker run --rm "$caddy_image" version | grep -F 'v2.11.4' >/dev/null
+docker run --rm "$traefik_image" version | grep -F 'v3.7.8-wnh-grpc1.82.1' >/dev/null
 docker run --rm --entrypoint sh "$postgis_image" -euc '
   test ! -e /usr/local/bin/gosu
   test "$(id -u)" = 70
@@ -669,7 +672,7 @@ docker rm --force "$socket_proxy_container" >/dev/null
 for image in \
   "$socket_proxy_image" \
   "$postgis_image" \
-  "traefik:v3.7.8@sha256:4299bbed850421258fc5448c2e0e6ad350981d4d335a68de11b92448aedbefe5" \
+  "$traefik_image" \
   "$caddy_image" \
   "axllent/mailpit:v1.30.4@sha256:5a49a77c5bdbe7c5474450b4f46348d09949df3695257729c93a30369382d4f6"; do
   docker run --rm \