A method of supplying credentials only when a job or workload starts, rather than storing them in code or static configuration. This reduces the persistence of secrets in repositories and build artifacts, but it only works when lifecycle controls and rotation are enforced.
Expanded Definition
Secret injection at runtime is the practice of delivering credentials, tokens, API keys, or certificates to a workload only at execution time, rather than embedding them in source code, images, or static configuration. For NHI Management Group, the security value is not the injection itself, but the reduction in secret persistence across repositories, build systems, and deployable artifacts. It is often used with ephemeral workloads, short-lived jobs, and automated pipelines where a non-human identity needs access just long enough to complete a task.
Definitions vary across vendors because some products describe any dynamic secret delivery as runtime injection, while others reserve the term for just-in-time retrieval from a secrets manager or identity broker. The distinction matters: runtime injection should include lifecycle controls, scoping, auditability, and rotation, otherwise it merely relocates the exposure window. In identity-heavy environments, this connects directly to non-human identity governance, especially where machines, agents, and services authenticate on their own behalf. The OWASP Non-Human Identity Top 10 is a useful reference point because it frames machine credentials as governed identities, not disposable implementation details.
The most common misapplication is treating a last-minute environment variable assignment as secure secret injection, which occurs when the credential is still long-lived, broadly scoped, or logged by the runtime.
Examples and Use Cases
Implementing secret injection rigorously often introduces orchestration and lifecycle complexity, requiring organisations to weigh reduced secret exposure against tighter coordination between identity, deployment, and rotation processes.
- CI/CD jobs fetch a short-lived API token from a secrets manager immediately before contacting a deployment target, then discard it when the pipeline step ends.
- An agentic AI workflow receives a narrowly scoped database credential at task start so the agent can complete a retrieval or update action without ever storing the secret in its prompt, code, or image layer.
- A scheduled batch job in a container platform mounts a certificate only while the pod is running, limiting exposure if the image or registry is later compromised.
- A service account for an internal microservice is issued an ephemeral secret from an identity broker, then rotated automatically after the workload exits or fails.
- A build process injects a signing key at runtime from a hardened vault, allowing artifact signing without placing the key in a developer workstation or repository cache.
Operational models vary, but the goal is consistent: keep credentials out of static artefacts and make them available only to the workload that needs them, when it needs them. That is why practices around secret handling overlap with guidance from the OWASP Non-Human Identity Top 10 and with modern workload identity design.
Why It Matters for Security Teams
Security teams care about secret injection at runtime because it changes the blast radius of compromise. If secrets are embedded in code, container images, or CI logs, a single exposure can become persistent access across environments. Runtime delivery reduces that persistence, but only when paired with strict scoping, monitoring, and rotation. Without those controls, an attacker who reaches the workload can still harvest the credential during execution.
This term is especially important in NHI governance because non-human identities often outnumber human accounts and are harder to inventory. Runtime injection can support least privilege, but it can also obscure ownership if teams do not track which workload received which secret, for how long, and for what purpose. That is why controls around secrets handling and access review are often aligned to broader identity governance expectations in OWASP Non-Human Identity Top 10 and the operational principles behind digital identity assurance.
Organisations typically encounter the real cost of weak runtime secret handling only after a pipeline leak, container escape, or agent misuse exposes a credential, at which point secret injection becomes operationally unavoidable to address.
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 address the attack and risk surface, while NIST CSF 2.0, NIST SP 800-63, NIST Zero Trust (SP 800-207) and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | Covers machine credential lifecycle risks central to runtime secret delivery. | |
| NIST CSF 2.0 | PR.AC-1 | Access control governance applies to limiting secret use to authorised workloads. |
| NIST SP 800-63 | Digital identity assurance informs how runtime-issued credentials should be trusted. | |
| NIST Zero Trust (SP 800-207) | Zero trust principles support per-request, per-workload credential exposure. | |
| NIST AI RMF | AI systems using runtime secrets need governance over access, tracing, and misuse. |
Track which workloads receive secrets and enforce short-lived, least-privilege machine credentials.
Related resources from NHI Mgmt Group
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on August 20, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
