Security teams should remove any SSH public keys that are not needed for active administration or deployment workflows, then keep a tight inventory of the keys that remain. For AWS CodeCommit, limit access to the minimum number of active keys, review them during access recertification, and treat key rotation as a controlled maintenance task rather than a permanent state.
Why unused SSH public keys should be removed from CodeCommit access
Unused SSH public keys are still valid access paths, which means they expand the attack surface even when no one is actively using them. For AWS CodeCommit, the security problem is not the key itself, but the stale trust it preserves. The safest posture is to keep only keys tied to a current operational need and remove the rest promptly.
That approach aligns with standard access-hygiene practice: eliminate dormant credentials, keep the remaining set small, and make every retained key easy to justify during review. When the key inventory is tight, it is simpler to spot drift, explain ownership, and prove that access is intentional rather than historical.
What to do with keys that are no longer needed
Remove keys that no longer support active administration or deployment workflows, rather than leaving them in place as a fallback. If a key is retained, it should have a clear owner, a current business purpose, and a review point. That is especially important when the same key could still authenticate from a laptop, CI job, or automation host that was once trusted.
Where SSH access is still required, prefer a short-lived or tightly governed access pattern over long-lived key reuse. A strong control point is inventory discipline: know which key maps to which use case, rotate or replace keys on a managed schedule, and treat the removal of unused keys as part of normal lifecycle management, not an exceptional cleanup.
How to keep CodeCommit key management from drifting
Build key review into access recertification so unused keys are identified before they become forgotten access. The practical question is whether the key still supports a live workflow today. If the answer is no, remove it. If the answer is yes, verify the owner, the workstation or pipeline using it, and the reason it still needs SSH rather than a more controlled access path.
For teams operating at scale, the main failure mode is accumulation: keys spread across users, automation, and old repos faster than anyone re-validates them. A disciplined inventory makes that visible. It also supports clean offboarding, because the team can remove stale keys when a person, pipeline, or integration changes role or is retired.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 addresses the attack surface, NIST SP 800-53 Rev 5 and CIS Controls v8 set the technical controls, and ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | SSH public keys are authenticators that need lifecycle control and removal when unused. |
| AC-2 — Account Management | Unused keys reflect stale account access and require recurring review and removal. | |
| Recommendation — Revoke unused SSH authenticators and enforce rotation, storage and lifecycle tracking. Review account-associated SSH keys and disable access that no longer has a valid business need. | ||
| CIS Controls v8 | CIS-5 — Account Management | Unused SSH keys are dormant access and fit account hygiene and removal practices. |
| Recommendation — Remove dormant SSH key access and keep a current inventory of active credentials. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | SSH key removal is access control hygiene for CodeCommit administration. |
| Recommendation — Apply access control rules to remove unused SSH public keys promptly. | ||
| OWASP Non-Human Identity Top 10 | NHI-01 — Improper Offboarding | Stale SSH keys are a common offboarding and access-removal failure mode for non-human access. |
| Recommendation — Remove stale SSH keys during offboarding and lifecycle review. | ||
Practitioner Guidance
What to verify: Confirm that every remaining SSH public key has a named owner, a current CodeCommit use case, and a documented review date. If you cannot tie the key to an active workflow, treat it as removable rather than “just in case” access.
Decision rule: If the key is not needed for active administration or deployment, remove it immediately; if it is still needed, shorten its lifetime by putting it under a review and rotation cadence. Use the inventory to distinguish stable operational keys from legacy access that should be retired.
Common mistake: Teams often focus on private-key protection and ignore old public keys left behind in the identity store. That leaves dormant access paths in place even after the corresponding user, host, or pipeline has changed.
Practitioner takeaway: The key management goal is not to preserve every historical access path, it is to ensure every remaining SSH key still earns its place through current operational necessity.
Related resources from NHI Mgmt Group
- How should security teams govern API keys used for generative AI access?
- How should security teams handle weak SSH keys that grant broad GitHub access?
- How should security teams handle leaked AWS keys that still have active admin access?
- How should security teams handle unencrypted SSH keys on developer and BYOD devices before granting access to sensitive apps?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 29, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
