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Run the scan gate; harden the image and stop short of release glas-harness asked for a scanned immutable image. The scan ran, and it failed on the base we had sanctioned, so no image was pushed. Every finding is inherited from the base image or its distro packages; none is in approval_engine code. Two fixes applied here: The base pin was stale. It named a Debian 13.5 build of python:3.12-slim while upstream is 13.6. Bumping the digest removes 30 HIGH and 47 MEDIUM on its own. Still a digest, not a floating tag. pip is gone from the runtime image. All 10 MEDIUM Python findings were in pip itself, a build-time tool with no business in a running approval service. The build is now two-stage, and pip is removed from both the venv and the base's /usr/local, so command -v pip returns nothing. What remains is a decision rather than a task. Three CRITICALs persist on Debian, all perl-base (CVE-2026-13221, CVE-2026-42496, CVE-2026-8376), none with an upstream fix, in a package this service never invokes and that Debian marks Essential. An Alpine variant carries no perl and scans 0 CRITICAL / 7 HIGH / 1 MEDIUM against Debian's 3 / 51 / 56. Alpine is proven viable rather than asserted: musl wheels resolve with no toolchain, the full suite passes on musl at 111 tests, and non-root uid 10001, schema v3, tenant:platform, fresh-store migrate/verify and both production fail-closed gates all hold in the built image. It is parked in Containerfile.alpine as a candidate; Containerfile remains sanctioned. Nothing was released. Pushing the Debian variant would pin three unfixable CRITICALs into a release digest, and choosing the runtime C library for this service is not a call to make silently. The manifest still carries REPLACE_WITH_RELEASE_DIGEST. Full record in docs/image-scan-2026-09-06.md. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PM5HnEAhokxdfcPqBNpT7D Assistant: claude-code Assistant-Model: opus Assistant-Process: 715850@bnt-lap001 Assistant-Session: eb557e93-7cb1-45d0-9e57-7d15b3edc60e
2026-09-06 22:52:20 +02:00
# Candidate hardened base — musl/Alpine. Carries no perl, which is where the
# Debian variant's three unfixable CRITICALs live (CVE-2026-13221, -42496,
# -8376 in perl-base, no upstream fix as of 2026-09-06).
#
# Not yet the sanctioned base. See docs/image-scan-2026-09-06.md.
FROM python:3.12-alpine@sha256:b64631e04e4920160c50fbe8d8df828f7f35f06f425cb44aa09bca53e708a35a AS build
ENV PYTHONDONTWRITEBYTECODE=1 \
PYTHONUNBUFFERED=1 \
PATH=/opt/venv/bin:$PATH
RUN python -m venv /opt/venv
WORKDIR /app
COPY pyproject.toml README.md ./
COPY approval_engine ./approval_engine
RUN pip install --no-cache-dir '.[serve]' \
&& rm -rf /opt/venv/bin/pip /opt/venv/bin/pip3 /opt/venv/bin/pip3.12 \
/opt/venv/lib/python3.12/site-packages/pip \
/opt/venv/lib/python3.12/site-packages/pip-*.dist-info \
/opt/venv/lib/python3.12/site-packages/setuptools \
/opt/venv/lib/python3.12/site-packages/setuptools-*.dist-info \
/opt/venv/lib/python3.12/site-packages/pkg_resources
FROM python:3.12-alpine@sha256:b64631e04e4920160c50fbe8d8df828f7f35f06f425cb44aa09bca53e708a35a
ENV PYTHONDONTWRITEBYTECODE=1 \
PYTHONUNBUFFERED=1 \
PATH=/opt/venv/bin:$PATH
RUN addgroup -S -g 10001 approval \
&& adduser -S -u 10001 -G approval -H approval \
&& rm -rf /usr/local/bin/pip /usr/local/bin/pip3 /usr/local/bin/pip3.12 \
/usr/local/lib/python3.12/site-packages/pip \
/usr/local/lib/python3.12/site-packages/pip-*.dist-info \
/usr/local/lib/python3.12/site-packages/setuptools \
/usr/local/lib/python3.12/site-packages/setuptools-*.dist-info \
/usr/local/lib/python3.12/site-packages/pkg_resources
COPY --from=build /opt/venv /opt/venv
WORKDIR /app
USER 10001:10001
EXPOSE 8080
ENTRYPOINT ["approval-engine"]
CMD ["serve", "--help"]
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