Key Sprawl

Expanded Definition

Key sprawl is the uncontrolled spread of api key, ssh key, signing keys, certificate keys, and similar secrets across clouds, CI/CD pipelines, application code, endpoints, and local files. In NHI security, the issue is not just quantity but fragmentation: no single owner, inventory, or lifecycle view exists, so issuance, rotation, and revocation become inconsistent.

Definitions vary across vendors on whether short-lived tokens count as part of key sprawl, but the operational meaning is clear: if defenders cannot trace where a key lives and whether it is still trusted, they cannot govern it effectively. That makes key sprawl a visibility and lifecycle problem as much as a storage problem, and it aligns closely with the control intent described in the NIST Cybersecurity Framework 2.0 under asset and access governance.

The most common misapplication is treating key sprawl as a vaulting issue alone, which occurs when organisations centralise some secrets but leave embedded copies, stale replicas, and unmanaged credentials active elsewhere.

Examples and Use Cases

Implementing key-sprawl controls rigorously often introduces operational friction, requiring organisations to weigh stronger oversight against the speed teams expect from automation.

• A platform team discovers the same deployment key duplicated across multiple repositories and runner images, making revocation risky because no one knows which workloads will fail.
• A cloud migration leaves old keys in local scripts and environment files after the move to managed identities, creating hidden access paths that bypass the new control plane.
• A software supply chain review finds signing keys stored in CI/CD variables, desktop password stores, and a shared wiki export, with no clear owner for rotation.
• A service account used for data exports persists after the original application is retired, but its key is still valid in backup systems and disaster recovery tooling.
• An incident response team uses the Ultimate Guide to NHIs — Key Challenges and Risks to prioritise locations where secrets commonly accumulate, then compares that inventory against patterns recommended in the NIST Cybersecurity Framework 2.0.

These use cases show why teams often need both discovery tooling and ownership workflows before they can reduce the number of active keys without breaking production systems.

Why It Matters in NHI Security

Key sprawl expands the attack surface because every extra copy of a key is another opportunity for leakage, misuse, or delayed revocation. In NHI environments, the risk is amplified by machine speed: a leaked key can be reused immediately, and duplicated keys often outlive the systems that created them. NHIMG research shows that 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools, which makes sprawl a common root condition rather than a rare exception. That same research also shows that 79% of organisations have experienced secrets leaks, with 77% of those incidents resulting in tangible damage, underscoring why key sprawl is a governance failure as much as a technical one.

Reducing sprawl usually requires inventory, ownership assignment, rotation policy, and removal of embedded credentials across development and production systems. It also supports broader NHI governance by making it possible to prove what exists, where it is used, and when it should be retired, which is central to guidance in the Ultimate Guide to NHIs — Key Challenges and Risks and to lifecycle discipline in the NIST Cybersecurity Framework 2.0.

Organisations typically encounter the business impact only after a leaked or orphaned key is used in an incident, at which point key sprawl becomes operationally unavoidable to address.

Related resources from NHI Mgmt Group

• SSH key sprawl
• What is secrets sprawl and why does it create security risk?
• Why does Agentic AI dramatically increase identity sprawl?
• What are the key NHI security metrics every CISO should track?