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[uk-ai-resilience] Untracked Dockerfile SHA-pinning gap: root Dockerfile alpine:3.24 unpinned (alert #940, Tier B) #61166
Description
Summary
A fresh code-scanning finding (alert #940, created 2026-09-15, rule pr-action.rules.dockerfile.image-pinning.dockerfile-non-sha-pinned-image, security_severity_level: high) flags that this repository's own root Dockerfile (used to build the gh-aw compiler container) references its base image by tag rather than by an immutable SHA256 digest:
FROM alpine:3.24
This is distinct from the previously tracked and already-remediated node:lts-alpine base used in actions/setup/js/Dockerfile.safe-outputs-mcp (covered by existing [container-image-scan] issues with a documented daily digest-refresh process) — no existing open issue covers this root Dockerfile's pinning gap.
Tier: B — Open With Conditions
| Dimension | Rating |
|---|---|
| Exposure amplification | Medium |
| Patchability | High |
| Detectability | High (scanner-flagged, unambiguous rule) |
| Operational fragility | Low |
| Ownership confidence | High |
Rationale
Images referenced by tag can change without notice, leading to non-deterministic builds and potential unreviewed security regressions in the base layer. This is a low-effort, high-detectability fix: pin to a specific @sha256:<digest> and add it to the existing container-pin refresh cadence already used for other images in this repo (e.g. --force-refresh-container-pins).
Remediation action
- Pin
FROM alpine:3.24toFROM alpine:3.24@sha256:<digest>in/Dockerfile. - Wire the pin into the existing automated digest-refresh workflow so it stays current with upstream Alpine security patches.
SLA urgency: Medium — 30 days
Reference
Full discussion report: see the "UK AI Open Code Risk & Resilience" weekly discussion report for 2026-09-08 to 2026-09-15 in this repository's Discussions.
Generated by UK AI Operational Resilience · copilot · auto · 87.8 AIC · ⌖ 6.25 AIC · ⊞ 8.2K · ◷
Activity
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github-actions commentedon Sep 18, 2026
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github-actions commentedon Sep 19, 2026
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github-actions commentedon Sep 19, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Sep 19, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Sep 19, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Sep 19, 2026
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github-actions commentedon Sep 19, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Sep 19, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Sep 20, 2026
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github-actions commentedon Sep 20, 2026
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github-actions commentedon Oct 2, 2026
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
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If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
I identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
Ive identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
Ive identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
Ive identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 2, 2026
🍪 Issue Monster selected this for Copilot
I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
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github-actions commentedon Oct 3, 2026
🍪 Issue Monster selected this for Copilot
I've identified this issue as a good candidate for automated resolution and requested assignment to the Copilot coding agent.
If assignment succeeds, the Copilot coding agent will analyze the issue and create a pull request with the fix.
Om nom nom! 🍪