When an open-source dependency appears abandoned, first find out exactly which versions your software uses and where they run. Then assess maintenance and security risk in your product before choosing whether to remove it, replace it, help maintain it, keep a controlled fork, or retain it temporarily with an owner and safeguards. Abandonment increases maintenance risk; it does not, by itself, prove that a release is vulnerable.
Confirm what is actually in your software
Do not decide based only on a package name in a manifest or a quiet repository. Establish the exact resolved version or versions, every direct and transitive use, and which applications, services, or shipped products include them. A dependency may be present in the tree without being reachable in every product path, while a transitive package may be easy to overlook.
Keep the dependency tree tied to the built artifact and its versioned source. The UK Home Office engineering guidance recommends generating a software bill of materials (SBOM) during builds and sharing it with operations so teams can identify what an application contains. See the Home Office guidance on using open-source software.
Decide whether it is truly abandoned—and what that means
Look at more than the date of the last commit. Review recent releases, maintainer announcements, support commitments, issue and vulnerability handling, maintainer diversity, dependency management, API stability, authenticity, licensing, and whether the package still fits your needs. A stale repository is a warning sign, not a conclusive verdict if maintainers have communicated a support plan or continue to provide security fixes through another channel.
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The OpenSSF’s Concise Guide for Evaluating Open Source Software, dated March 28, 2025, offers activity and release within the previous 12 months as example checks. That is a guide criterion, not a universal cutoff that automatically defines abandonment. As the OpenSSF Best Practices Working Group puts it: “Unmaintained software is a risk; most software needs continuous maintenance.”
Check security without treating silence as proof
Check for known vulnerabilities and examine how the project responds to security reports: whether fixes arrive promptly, whether older releases receive fixes, and whether long-term support is offered. No advisory found does not mean a package is safe. Nor does the absence of recent releases establish a vulnerability.
Rank #2
Prioritize based on your actual use: which functionality is reachable, how exposed it is, what data or systems it can affect, and the likely consequences of a failure or exploit. The cited guidance does not set one severity formula for every product, so document the reasoning behind your own prioritization.
Verify the source and successor
If a project points users to a successor or you find a fork, verify that it is authentic and that its maintainers, release process, and artifacts are trustworthy. A similar name or a popular repository is not enough to establish that a package is an official successor or a suitable replacement.
Choose a response that fits the risk and the cost
| Option | When it fits | What to account for |
|---|---|---|
| Remove | The functionality is unnecessary, already covered elsewhere, or can be implemented safely without the dependency. | Removing a dependency can reduce supply-chain risk, but reimplementing it can introduce bugs or vulnerabilities. |
| Replace | A maintained alternative meets the required behavior and has a compatible license. | Compare API and feature fit, security response, known vulnerabilities, dependency footprint, provenance, license, and migration effort. Popularity alone is not a reason to choose a package. |
| Help maintain upstream | The project can accept contributions or coordinate a handover, and your team can contribute responsibly. | Confirm governance and responsibilities. A contribution is not a guarantee that maintainers will accept it or resume work. |
| Maintain a fork | The code is essential and removal or migration is not practical. | Assign people to review changes, handle vulnerability reports, publish releases, and track upstream. Keep downstream changes small: a growing patch set can make future updates harder. |
| Retain temporarily with controls | There is a documented reason to defer removal or migration while the dependency remains necessary. | Name an owner, record the resolved version and rationale, scan and monitor the component and its transitive dependencies, and set a reassessment point. |
These are different maintenance commitments, not five ways to postpone the same decision. CISA and the FBI advise selecting well-maintained projects and contributing to ongoing maintenance where appropriate. OpenSSF warns that downstream modifications tend to accumulate. See the CISA/FBI secure software development guidance and the OpenSSF guide on evaluating open-source software.
Evaluate replacements before migrating
Assess candidates against the product’s actual requirements, not just a feature checklist. A useful comparison covers:
- Required API and behavior, including compatibility with your callers.
- Maintenance evidence and security response practices.
- Known vulnerabilities and the health of transitive dependencies.
- Authenticity of the project and provenance of its released artifacts.
- License compatibility with your product and distribution model.
- Secure defaults and documentation for the features you will use.
- Migration work and the ongoing effort needed to keep the alternative healthy.
A replacement can reduce one risk while adding others, including a larger dependency tree or a difficult migration. Assess it by the same standards you used for the original component.
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Use the package manager and preserve a complete dependency record. For applications, use lockfiles where the ecosystem supports them; include hashes where available so builds resolve reproducibly and tampering can be detected. Cache dependencies from trusted sources in the build system rather than updating products or customer systems directly from unverified public sources. CISA and the FBI make that supply-chain caution in their secure software development guidance.
Best Value
Test after dependency changes, including functional and security behavior, and cover the platforms and configurations that matter to users. OpenSSF recommends automated tests for dependency changes. Teams using GitHub can use dependency review to surface changes, release dates, usage information, and known vulnerability data in pull requests; availability depends on repository type and enabled security features, and the review action can be configured to block flagged changes. GitHub is one implementation option, not a requirement or the only way to review dependencies. See GitHub’s dependency review documentation.
If you cannot upgrade a critical component
When migration or upgrade is impractical, consider backporting a vulnerability fix downstream or into a stable or long-term-support branch. Record where each patch came from, test the resulting build, and consider contributing the backport or support upstream. A private patch without provenance or a plan for future updates can become another maintenance burden.
Keep ownership and reassessment explicit
If you retain the dependency, make the decision operational rather than informal. Record the package and exact resolved version, the product paths that use it, the owner responsible for monitoring it, and the reason known issues are or are not exploitable in your product. Track vulnerability and end-of-life alerts, and schedule reassessment as the package, product exposure, and available alternatives change.
CISA and the FBI advise manufacturers to publish written rationale when they conclude that a critical vulnerability cannot be exploited in their product. That is guidance for manufacturers, not a legal requirement for every team; the useful principle is to make consequential risk decisions reviewable rather than leaving them implicit.
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