{ "api_version": "1", "kind": "dse_post", "self": "https://update.dsesecurity.com/api/v1/posts/review-docker-host-trust-separately-from-application-container-ca-trust/", "item": { "id": "https://update.dsesecurity.com/updates/review-docker-host-trust-separately-from-application-container-ca-trust/", "slug": "review-docker-host-trust-separately-from-application-container-ca-trust", "url": "https://update.dsesecurity.com/updates/review-docker-host-trust-separately-from-application-container-ca-trust/", "alternate_urls": { "markdown": "https://update.dsesecurity.com/updates/review-docker-host-trust-separately-from-application-container-ca-trust.md", "json": "https://update.dsesecurity.com/api/v1/posts/review-docker-host-trust-separately-from-application-container-ca-trust/" }, "title": "Review Docker host trust separately from application-container CA trust", "summary": "Check the application container’s trust configuration and persistence instead of treating a successful Docker pull as its HTTPS trust test.", "format": { "slug": "guide", "name": "Guide" }, "priority": { "slug": "advisory", "name": "Advisory" }, "featured": false, "image": { "theme": "cyber-defense", "label": "Cyber defense", "alt": "Layered glass and metal cyber-defense structure with controlled blue and gold signal paths.", "card_url": "https://update.dsesecurity.com/assets/editorial/cyber-defense-card.webp?v=1.8.20", "hero_url": "https://update.dsesecurity.com/assets/editorial/cyber-defense-hero.webp?v=1.8.20", "social_url": "https://update.dsesecurity.com/assets/editorial/cyber-defense-social-v2.jpg?v=1.8.20", "width": 2400, "height": 1350 }, "topics": [ { "slug": "cybersecurity", "name": "Cybersecurity", "url": "https://update.dsesecurity.com/topic/cybersecurity/" }, { "slug": "it", "name": "IT", "url": "https://update.dsesecurity.com/topic/it/" } ], "author": { "name": "DSE Security Editorial Team", "url": "https://update.dsesecurity.com/#editorial-team", "type": "Organization" }, "publisher": { "name": "Detection Systems & Engineering", "url": "https://dsesecurity.com/" }, "published_at": "2026-10-30T06:04:23+00:00", "modified_at": "2026-10-30T06:05:14+00:00", "reviewed_on": "2026-10-30", "reading_minutes": 3, "word_count": 553, "potentially_affected": "Docker workloads requiring approved internal or proxy CA certificates, including Linux image or container trust setup.", "dse_recommendation": "Review host and application-container trust independently, including how approved CA installation survives recreation.", "primary_source": { "name": "Docker Docs — Use CA certificates with Docker", "url": "https://docs.docker.com/engine/network/ca-certs/", "published_on": null, "authority": "docs.docker.com" }, "publishing_principles": "https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/", "usage_info": "https://update.dsesecurity.com/usage/", "copyright_notice": "Copyright © 2026 Detection Systems & Engineering. All rights reserved.", "content_html": "

Bottom line: Test the intended application HTTPS path from its container context. Keep Docker-host trust, container trust and the planned persistence of an approved CA installation as separate review items.

\n

Source fact: documented behavior

\n

The Use CA certificates with Docker documentation is the primary reference.

\n

Docker documents host CA installation for Docker operations separately from adding the CA to a container trust store during image build or at runtime. The guide warns that an SDK, runtime or framework may need additional steps beyond installing a CA in the operating-system trust store. Certificates installed directly into a running container do not persist when that container is destroyed or recreated. The Linux installation commands on the page target Ubuntu-based images or containers and require distribution-equivalent commands elsewhere.

\n

What the source does not establish

\n

This article concerns trust-store placement and persistence for an approved CA. It does not approve a traffic-inspection service, issue certificates or promise that every application uses the operating-system store. Keep registry client-certificate naming and authorization separate, and do not disable verification to obtain a successful request.

\n

Applicability questions

\n\n

DSE recommendation: name the trust consumer and its lifetime

\n

DSE recommends a trust map naming the Docker client operation, container operating-system store and application runtime as separate entries. Ask the security and application owners to identify the approved CA and intended endpoint. Retain safe certificate identifiers and authorization references instead of private material.

\n

Inspect the actual application image and runtime before choosing installation instructions. Use the documented distribution branch where applicable and obtain the runtime-specific procedure when additional trust configuration is required. Do not copy Ubuntu commands into an unrelated image merely because a package name looks familiar.

\n

Choose the lifetime of the change explicitly. If a temporary running-container adjustment is authorized for diagnosis, record its scope and cleanup. For a persistent deployment requirement, review the managed image-build process and the approved certificate update path. Keep an interactive diagnostic success from silently becoming an undocumented production dependency.

\n

Test the request the application actually makes. Preserve the endpoint identity, trust configuration and relevant sanitized failure before changing anything. After an approved correction, compare the same request from the intended runtime. Keep successful host-side image retrieval as separate evidence, and ask the application owner to review any remaining name, chain, runtime or authorization issue without broadening trust indiscriminately.

\n

Verification and evidence

\n

Proposed verification, not performed: use an approved test endpoint and a disposable image representative of the real distribution and runtime. Record host-side Docker access separately from an application HTTPS request inside the test container. Apply only the authorized CA configuration and repeat that same request.

\n

If persistence is required, recreate a container from the reviewed image and repeat the application check. Retain the image identity, safe CA identifier, installation method, runtime configuration and actual outcomes. Remove temporary diagnostic changes through the lab procedure. Report the specific trust consumer and lifecycle tested, without claiming universal runtime compatibility or approval of arbitrary interception certificates.

\n

Official references

\n\n

Source review completed October 30, 2026. Recheck the official documentation and deployment-specific applicability before a production change.

\n", "content_text": "Bottom line: Test the intended application HTTPS path from its container context. Keep Docker-host trust, container trust and the planned persistence of an approved CA installation as separate review items.\nSource fact: documented behavior\nThe Use CA certificates with Docker documentation is the primary reference.\nDocker documents host CA installation for Docker operations separately from adding the CA to a container trust store during image build or at runtime. The guide warns that an SDK, runtime or framework may need additional steps beyond installing a CA in the operating-system trust store. Certificates installed directly into a running container do not persist when that container is destroyed or recreated. The Linux installation commands on the page target Ubuntu-based images or containers and require distribution-equivalent commands elsewhere.\nWhat the source does not establish\nThis article concerns trust-store placement and persistence for an approved CA. It does not approve a traffic-inspection service, issue certificates or promise that every application uses the operating-system store. Keep registry client-certificate naming and authorization separate, and do not disable verification to obtain a successful request.\nApplicability questions\n\nWhich exact application request and endpoint require the approved CA?\nWhat host, image distribution and application runtime are involved?\nWhere does that runtime obtain trusted roots?\nShould the installation be a temporary diagnostic change or a reviewed image-build change?\n\nDSE recommendation: name the trust consumer and its lifetime\nDSE recommends a trust map naming the Docker client operation, container operating-system store and application runtime as separate entries. Ask the security and application owners to identify the approved CA and intended endpoint. Retain safe certificate identifiers and authorization references instead of private material.\nInspect the actual application image and runtime before choosing installation instructions. Use the documented distribution branch where applicable and obtain the runtime-specific procedure when additional trust configuration is required. Do not copy Ubuntu commands into an unrelated image merely because a package name looks familiar.\nChoose the lifetime of the change explicitly. If a temporary running-container adjustment is authorized for diagnosis, record its scope and cleanup. For a persistent deployment requirement, review the managed image-build process and the approved certificate update path. Keep an interactive diagnostic success from silently becoming an undocumented production dependency.\nTest the request the application actually makes. Preserve the endpoint identity, trust configuration and relevant sanitized failure before changing anything. After an approved correction, compare the same request from the intended runtime. Keep successful host-side image retrieval as separate evidence, and ask the application owner to review any remaining name, chain, runtime or authorization issue without broadening trust indiscriminately.\nVerification and evidence\nProposed verification, not performed: use an approved test endpoint and a disposable image representative of the real distribution and runtime. Record host-side Docker access separately from an application HTTPS request inside the test container. Apply only the authorized CA configuration and repeat that same request.\nIf persistence is required, recreate a container from the reviewed image and repeat the application check. Retain the image identity, safe CA identifier, installation method, runtime configuration and actual outcomes. Remove temporary diagnostic changes through the lab procedure. Report the specific trust consumer and lifecycle tested, without claiming universal runtime compatibility or approval of arbitrary interception certificates.\nOfficial references\n\nUse CA certificates with Docker — Docker Docs.\n\nSource review completed October 30, 2026. Recheck the official documentation and deployment-specific applicability before a production change.", "content_markdown": "Bottom line: Test the intended application HTTPS path from its container context. Keep Docker-host trust, container trust and the planned persistence of an approved CA installation as separate review items.\n\n## Source fact: documented behavior\n\nThe [Use CA certificates with Docker](https://docs.docker.com/engine/network/ca-certs/) documentation is the primary reference.\n\nDocker documents host CA installation for Docker operations separately from adding the CA to a container trust store during image build or at runtime. The guide warns that an SDK, runtime or framework may need additional steps beyond installing a CA in the operating-system trust store. Certificates installed directly into a running container do not persist when that container is destroyed or recreated. The Linux installation commands on the page target Ubuntu-based images or containers and require distribution-equivalent commands elsewhere.\n\n## What the source does not establish\n\nThis article concerns trust-store placement and persistence for an approved CA. It does not approve a traffic-inspection service, issue certificates or promise that every application uses the operating-system store. Keep registry client-certificate naming and authorization separate, and do not disable verification to obtain a successful request.\n\n## Applicability questions\n\n- Which exact application request and endpoint require the approved CA?\n\n- What host, image distribution and application runtime are involved?\n\n- Where does that runtime obtain trusted roots?\n\n- Should the installation be a temporary diagnostic change or a reviewed image-build change?\n\n## DSE recommendation: name the trust consumer and its lifetime\n\nDSE recommends a trust map naming the Docker client operation, container operating-system store and application runtime as separate entries. Ask the security and application owners to identify the approved CA and intended endpoint. Retain safe certificate identifiers and authorization references instead of private material.\n\nInspect the actual application image and runtime before choosing installation instructions. Use the documented distribution branch where applicable and obtain the runtime-specific procedure when additional trust configuration is required. Do not copy Ubuntu commands into an unrelated image merely because a package name looks familiar.\n\nChoose the lifetime of the change explicitly. If a temporary running-container adjustment is authorized for diagnosis, record its scope and cleanup. For a persistent deployment requirement, review the managed image-build process and the approved certificate update path. Keep an interactive diagnostic success from silently becoming an undocumented production dependency.\n\nTest the request the application actually makes. Preserve the endpoint identity, trust configuration and relevant sanitized failure before changing anything. After an approved correction, compare the same request from the intended runtime. Keep successful host-side image retrieval as separate evidence, and ask the application owner to review any remaining name, chain, runtime or authorization issue without broadening trust indiscriminately.\n\n## Verification and evidence\n\nProposed verification, not performed: use an approved test endpoint and a disposable image representative of the real distribution and runtime. Record host-side Docker access separately from an application HTTPS request inside the test container. Apply only the authorized CA configuration and repeat that same request.\n\nIf persistence is required, recreate a container from the reviewed image and repeat the application check. Retain the image identity, safe CA identifier, installation method, runtime configuration and actual outcomes. Remove temporary diagnostic changes through the lab procedure. Report the specific trust consumer and lifecycle tested, without claiming universal runtime compatibility or approval of arbitrary interception certificates.\n\n## Official references\n\n- [Use CA certificates with Docker](https://docs.docker.com/engine/network/ca-certs/) — Docker Docs.\n\nSource review completed October 30, 2026. 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Keep Docker-host trust, container trust and the planned persistence of an approved CA installation as separate review items.\nSource fact: documented behavior\nThe Use CA certificates with Docker documentation is the primary reference.\nDocker documents host CA installation for Docker operations separately from adding the CA to a container trust store during image build or at runtime. The guide warns that an SDK, runtime or framework may need additional steps beyond installing a CA in the operating-system trust store. Certificates installed directly into a running container do not persist when that container is destroyed or recreated. The Linux installation commands on the page target Ubuntu-based images or containers and require distribution-equivalent commands elsewhere.\nWhat the source does not establish\nThis article concerns trust-store placement and persistence for an approved CA. It does not approve a traffic-inspection service, issue certificates or promise that every application uses the operating-system store. Keep registry client-certificate naming and authorization separate, and do not disable verification to obtain a successful request.\nApplicability questions\n\nWhich exact application request and endpoint require the approved CA?\nWhat host, image distribution and application runtime are involved?\nWhere does that runtime obtain trusted roots?\nShould the installation be a temporary diagnostic change or a reviewed image-build change?\n\nDSE recommendation: name the trust consumer and its lifetime\nDSE recommends a trust map naming the Docker client operation, container operating-system store and application runtime as separate entries. Ask the security and application owners to identify the approved CA and intended endpoint. Retain safe certificate identifiers and authorization references instead of private material.\nInspect the actual application image and runtime before choosing installation instructions. Use the documented distribution branch where applicable and obtain the runtime-specific procedure when additional trust configuration is required. Do not copy Ubuntu commands into an unrelated image merely because a package name looks familiar.\nChoose the lifetime of the change explicitly. If a temporary running-container adjustment is authorized for diagnosis, record its scope and cleanup. For a persistent deployment requirement, review the managed image-build process and the approved certificate update path. Keep an interactive diagnostic success from silently becoming an undocumented production dependency.\nTest the request the application actually makes. Preserve the endpoint identity, trust configuration and relevant sanitized failure before changing anything. After an approved correction, compare the same request from the intended runtime. Keep successful host-side image retrieval as separate evidence, and ask the application owner to review any remaining name, chain, runtime or authorization issue without broadening trust indiscriminately.\nVerification and evidence\nProposed verification, not performed: use an approved test endpoint and a disposable image representative of the real distribution and runtime. Record host-side Docker access separately from an application HTTPS request inside the test container. Apply only the authorized CA configuration and repeat that same request.\nIf persistence is required, recreate a container from the reviewed image and repeat the application check. Retain the image identity, safe CA identifier, installation method, runtime configuration and actual outcomes. Remove temporary diagnostic changes through the lab procedure. Report the specific trust consumer and lifecycle tested, without claiming universal runtime compatibility or approval of arbitrary interception certificates.\nOfficial references\n\nUse CA certificates with Docker — Docker Docs.\n\nSource review completed October 30, 2026. 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