The period during which credentials exist in memory, environment variables, files, or process context while code is running. It matters because malware does not need to steal a stored secret if it can read one at the moment the system uses it.
Expanded Definition
Execution-time secret residency refers to the narrow but high-risk window when a credential is loaded into memory, exposed through environment variables, written to a temporary file, or attached to process context while an application is actively running. In NHI security, this matters because the secret does not need to be stolen from a vault if an attacker can read it at the moment of use.
Definitions vary across vendors on whether process environment, container metadata, and in-memory caches all count equally, but the operational point is consistent: the secret is reachable by code and often by other processes during execution. NHI Management Group treats this as a lifecycle exposure problem, not just a storage problem. It connects directly to the OWASP Non-Human Identity Top 10 and to control expectations in NIST SP 800-53 Rev 5 Security and Privacy Controls, where access control and system integrity both depend on reducing unnecessary exposure. The most common misapplication is assuming a secret is safe because it is not stored persistently, which occurs when teams ignore runtime inspection paths, crash dumps, and inherited process state.
Examples and Use Cases
Implementing execution-time secret controls rigorously often introduces performance and engineering constraints, requiring organisations to weigh reduced exposure against application complexity and debugging friction.
- CI/CD jobs inject API keys as environment variables, then a malicious build step reads the values during execution, similar to patterns discussed in the CI/CD pipeline exploitation case study.
- A containerised service pulls a short-lived token into memory for outbound calls, then a sidecar or compromised sibling process scrapes the token before it expires.
- A developer formats code with a plugin that logs process variables, echoing the credential exposure dynamics described in Code Formatting Tools Credential Leaks.
- A build agent writes a secret to a temporary file for compatibility, and that file survives long enough for malware to enumerate it, a pattern often associated with the Guide to the Secret Sprawl Challenge.
- An application uses a runtime-loaded certificate from a local keystore, but verbose debug logs or core dumps expose the material during incident response.
These use cases show why runtime exposure is a practical concern, not an abstract one. The same secret can be low risk when vaulted, moderately risky when delivered to a host, and highly exposed once it enters memory or environment space. The behaviour of toolchains, shells, and orchestration layers determines how long that secret remains reachable.
Why It Matters in NHI Security
Execution-time secret residency is where many “stored securely” claims break down. NHI Management Group reports that 96% of organisations store secrets outside of secrets managers in vulnerable locations including code, config files, and CI/CD tools, and 79% have experienced secrets leaks, with 77% of those incidents causing tangible damage. Runtime exposure makes those leaks easier to exploit because the attacker only needs a brief read window, not durable access to a vault.
This term also matters because NHI estates are large, dynamic, and difficult to inspect. In environments where service accounts, API keys, and automation tokens are already overused, any extra residency time increases the chance of scraping, logging, dumping, or lateral reuse. That is why secret minimisation, just-in-time delivery, and rapid rotation are not separate topics but complementary defences. The issue aligns with operational expectations in OWASP and the broader control intent of NIST, but the implementation burden remains on the organisation to reduce runtime dwell time and visibility. Organisational teams typically encounter the consequence only after a token appears in logs, a memory dump, or an incident replay, at which point execution-time secret residency 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 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Addresses secret exposure paths, including runtime and memory-based leakage. |
| NIST CSF 2.0 | PR.AC-1 | Access control must limit which processes and users can reach active credentials. |
Minimise runtime secret exposure and verify secrets are not reachable through logs, dumps, or sibling processes.
