A software supply chain incident response plan is a section of your incident plan that covers events caused by components you did not write: compromised dependencies, leaked tokens, poisoned builds and malicious updates. It adds steps for finding affected builds, rotating credentials, rebuilding artifacts and communicating about third party code.
Definition
Software supply chain incident: an event where code, a build process or a credential used to produce or deliver software is altered or exposed, so that software you build or run is untrustworthy. The cause is upstream of your own source code.
How it differs from a normal plan
A general plan covers detection, response and recovery, which NIST SP 800-61 Rev. 3 places inside cybersecurity risk management. The supply chain plan keeps that shape and adds what is specific here.
| Section | Contents |
|---|---|
| Triggers | Advisory of malicious release, registry removal, leaked token, tampered build |
| Severity | Present, executed, shipped, using a scale agreed in advance |
| Inventory | How to search lockfiles, SBOMs, images, mirrors, machines |
| Containment | Freeze pipeline, block version, revoke tokens |
| Evidence | What to save before cleanup |
| Rotation | Order for secrets by blast radius |
| Rebuild | Clean runners, caches, signed artifacts |
| Communication | Internal notice, customers, regulators, registry |
| Recovery and close | Closure checklist and review |
Four playbooks to attach
- Compromised dependency. Find, pin, rebuild, rotate.
- Leaked token. Revoke, check use, review what it could change.
- Poisoned build. Freeze, compare, reset runners and caches.
- Malicious update from a vendor. Pause update, check scope, ask the vendor for facts.
Steps to build the plan
- Start from your existing plan and add the sections above.
- Write the one page contact sheet and name roles with deputies.
- Run a tabletop with one scenario and fix the gaps. See how to run a tabletop for a supply chain breach.
- Review after every real event and at least yearly.
What a good plan avoids
Avoid plans that only name tools, since tools change. Avoid plans with no owner, no deputy and no review date. Avoid plans that assume the perfect log, because teams rarely have it. Write what to do when evidence is missing, such as rebuilding clean and rotating powerful secrets anyway. Keep the plan short enough that someone can use it at three in the morning.
Try it yourself
Click through it at your own pace, or open it full screen.
See how one control maps to several frameworks, which helps show where an incident plan supports compliance evidence.
Quick check
Do I need a separate plan?
Usually a section or annex is enough, linked from the main incident plan.
Who owns the plan?
Security owns it, with engineering, legal and communications named as contributors.
Safeguard's SBOM and dependency scanning, policies and gates, and compliance and evidence automation support several of these sections. A free scan is at gold.safeguard.sh/scan.
Sources
Last reviewed: 19 October 2026.
