Technical due diligence examines technology in the context of a business decision; a code audit examines a defined codebase or software artifact. A deal review may include code analysis, but a code audit alone does not establish the health of a supplier, product, or operating environment. The right scope depends on the decision you need to make and the evidence needed to make it.
Technical due diligence vs. code audit
The terms describe different kinds of work, not two universally standardized packages. “Technical due diligence” is generally decision-oriented: it investigates technology risks and capabilities relevant to an acquisition, investment, supplier decision, carve-out, or major operating change. “Code audit” usually means a focused review of selected software, but its exact boundaries depend on the engagement agreement.
| Dimension | Technical due diligence | Code audit |
|---|---|---|
| Purpose | Inform an investment, acquisition, supplier, carve-out, or other major decision. | Answer defined questions about a particular codebase or software artifact. |
| Unit of review | The technology asset and relevant supplier, product, lifecycle, and operating context. | Selected repositories, components, builds, or releases. |
| Typical evidence | Architecture and product information, supplier and lifecycle evidence, security and operational information, and potentially source code. | Source code, configuration, dependencies, tests, build outputs, and observed test behavior, as agreed. |
| Security and quality focus | Material risks in the context of the decision, tailored to system criticality and deal needs. | Implementation defects and weaknesses found in the reviewed scope using the agreed methods. |
| Useful output | Decision-relevant risks, gaps, dependencies, and questions that may affect the transaction or post-deal plan. | Findings tied to examined code and methods, with severity, reproduction details where appropriate, and remediation suggestions. |
| Main limitation | Scope and access constraints can leave areas unexamined; due diligence is not a guarantee. | A narrow review can miss supplier, business, operational, or lifecycle risks outside the artifact. |
This is a practical comparison, not a prescribed deliverables list. ISO/IEC/IEEE 41062:2024 provides acquisition guidance, while NIST IR 8397 describes software verification techniques; neither establishes a universal commercial “code audit” package. See the IEC Webstore description of ISO/IEC/IEEE 41062:2024 and NIST IR 8397.
What should technical due diligence include?
Begin with the decision: what technology is being acquired or relied on, what evidence is available, and which findings could change the decision or the plan afterward? The appropriate review can vary with software type and procurement context. ISO/IEC/IEEE 41062:2024 describes acquisition activities spanning evaluation, selection, implementation, acceptance, operation, and support. It applies to external software suppliers and can cover off-the-shelf, custom, SaaS, and open-source software. The standard treats security and safety as attributes to consider, while specific information-assurance, safety, and cloud-service requirements are outside its scope.
When the concern is cybersecurity risk from an ICT supplier, NIST SP 1326 offers a supplier-risk lens with five assessment components:
- Foreign Ownership, Control, or Influence (FOCI)
- Provenance
- Resilience
- Foundational Cyber Practices
- Supply Chain Tiers
NIST published the final SP 1326 on July 8, 2026. Its framework concerns supplier risk; it is not a complete checklist for every M&A technology review. Read the NIST SP 1326 final publication.
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Software quality and maintainability can also matter to a transaction. CISQ describes measures addressing security, reliability, performance efficiency, and maintainability, and notes that technical-debt measures can help indicate possible operational problems or excessive maintenance costs in M&A. These are dimensions to investigate, not scores proven to predict deal outcomes. The source provides no quantified prediction or comparative effect size. See CISQ’s due-diligence discussion.
What does a code audit cover?
A code audit can examine a chosen codebase or artifact using methods agreed by the parties. NIST IR 8397, published October 6, 2021, recommends techniques such as threat modeling, automated testing, static code scanning, heuristic detection of hardcoded secrets, checks for built-in protections, black-box and structural tests, historical tests, fuzzing, web-application scanners where applicable, and review of included libraries, packages, and services. NIST describes these as broadly applicable recommendations, not the totality of software verification.
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NIST’s guidance related to Executive Order 14028 also discusses manual or automated code-review tools, static and dynamic analysis, software-composition tools, and penetration testing as source-code testing approaches. Their inclusion is not automatic: a title such as “code audit” does not show that penetration testing, architecture assessment, licensing review, or runtime review took place. The engagement scope must say whether each is included. See NIST’s EO 14028 software supply-chain security guidance.
Acquisition evidence can extend beyond code. CISA’s Software Acquisition Guide asks suppliers about cybersecurity in tool selection, information needed to rebuild software, and auditability in development toolchains. Those details can inform a broader acquisition assessment, but they do not replace code review when code-level assurance is required. The CISA Software Acquisition Guide is written for government enterprise consumers.
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Can a code audit replace technical due diligence?
Not when the decision depends on risks outside the reviewed artifact. A code audit can reveal implementation weaknesses or provide evidence about selected components, but it does not automatically assess supplier provenance, resilience, operational capability, product context, or lifecycle practices. Conversely, technical due diligence may examine those broader questions without a detailed code review unless code analysis is specifically commissioned.
Use the distinction to match the work to the decision:
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- Choose technical due diligence when the question concerns a transaction, supplier, software asset, or capability and risk beyond the code itself.
- Choose a code audit when you need evidence about implementation quality or security in a specific codebase or software artifact.
- Commission both when source-code evidence is material to a broader deal decision and supplier, operational, or lifecycle questions also matter.
How to scope an assessment
Agree the boundaries before work begins. The following prompts are practical scoping guidance, not a mandatory standard checklist:
- State the decision. Identify what the assessment must inform and which findings could change the decision or follow-on plan.
- Name the technology under review. Specify target systems, repositories, components, versions, builds, or releases.
- Set broader review areas. Decide whether supplier, architecture, security, resilience, and lifecycle questions are in scope.
- Choose verification methods. Specify code-review and testing techniques, including whether runtime testing is allowed or expected.
- Record access limits and assumptions. Identify unavailable evidence, test-environment constraints, and any areas that will remain unexamined.
- Define the report. Agree on findings format, severity definitions, reproduction details, remediation guidance, readout audience, and follow-up expectations.
- Call out optional areas. State whether licensing, compliance, team and process, or operational review is included rather than assuming it from the engagement name.
For broader software acquisition context, ISO also lists ISO/IEC 20741:2017 as reviewed and confirmed in 2022 and still current. That status is publication metadata, not a claim that the standard defines a code-audit scope.
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