How to Remediate Vulnerabilities Your Scanner Marks "No Fix Available"
When your scanner marks a vulnerability "no fix available," it means no upstream vendor has published an upgrade that closes the CVE — a Common Vulnerabilities and Exposures identifier for a known security flaw. The practical remedy is back-porting: applying the security fix directly to the exact library or operating-system version you already run, rather than waiting for an upgrade that may never arrive. Seal Security does exactly this, turning dead-end scanner findings into verified fixes so you stay on your current version and stay protected. This lets application and product security teams remediate transitive dependencies, end-of-life libraries, and legacy systems that otherwise sit open indefinitely.
Why do scanners mark vulnerabilities "no fix available"?
Scanners mark vulnerabilities "no fix available" because software composition analysis (SCA) tools — the scanners like Snyk, Checkmarx, and Black Duck that inventory your open-source dependencies for known flaws — can only point to fixes that upstream maintainers have already released. When a maintainer has abandoned a project, hasn't yet patched a CVE, or the flaw lives in a transitive dependency you don't control, the scanner has nothing to recommend. That gap is the difference between scanning and remediation: scanning finds vulnerabilities, but remediation actually closes them.
Three recurring situations produce the "no fix available" verdict:
- Transitive dependencies — a vulnerable package pulled in indirectly by another library, where you cannot simply bump the version without breaking the parent.
- End-of-Life (EOL) software — libraries or operating systems, such as CentOS after Red Hat ended support in June 2024, that no longer receive vendor patches.
- Legacy systems — older library versions still running in production where an upgrade path is either untested, unavailable, or too risky to attempt.
In our analysis, the phrase itself is misleading: it conflates "unpatchable" with "not-upgradeable," and most of the time it means the latter. A fix may exist only in a major release that changes an API your service relies on — so the flaw is solvable, but the upgrade path is closed to you. In each case the CVE is real and your compliance obligations still apply, but the conventional answer — upgrade — is blocked. Back-porting sidesteps that wall by patching the version in place.
What is back-porting, and how does it fix the unfixable?
Back-porting is the practice of applying a security fix to the older version of a library or package you already run, instead of upgrading to a newer release. Seal Security uses this mechanism to fix the unfixable — securing the transitive dependencies, EOL libraries, and legacy systems that scanners flag as having no upstream remedy. Instead of forcing you onto a new major version that may change APIs and break production, Seal isolates the specific code change that closes the CVE and applies it to your current version.
This matters because an upgrade is rarely a one-line change. A newer library version can alter behavior, drop compatibility, or ripple through your build in ways that demand regression testing and engineering time. Back-porting keeps the surface stable: the version number you depend on stays the same, so your integration, tests, and runtime behavior stay the same — only the vulnerability is gone. As Kyle Kurdziolek, VP of Security at BigID, put it, "I can maintain the same version of my library, but do it in a way that's vulnerability free."
Seal's coverage spans Java, JavaScript, Go, Ruby, C/C++, Python, PHP, and C#, across package ecosystems including Maven, npm, PyPI, Poetry, Gradle, Yarn, yum, dnf, apt, apk, Composer, NuGet, and Bundler, plus old and EOL Linux distributions such as RHEL, CentOS, Alpine, Debian, Ubuntu, and Oracle. That breadth is what lets the platform reach vulnerabilities buried where upstream fixes don't exist.
Getting the fix is only half the problem; trusting it is the other half. Many drive-by community patches change code without closing the underlying flaw. Seal's patches are human-vetted, machine-tested, and AI-validated — reviewed by security engineers, exercised through automated testing, and confirmed to actually neutralize the vulnerability rather than merely bumping a version string. Every Sealed library also ships with a signed software bill of materials (SBOM) in SPDX or CycloneDX format — the two dominant open standards for documenting exactly what components a piece of software contains — giving auditors a verifiable record of what was fixed. There is no lock-in: Sealed libraries remain in your registry indefinitely. And because Seal delivers a ready, validated patch for the version already in production, security teams can remediate vulnerabilities themselves rather than filing tickets and waiting on developers. As Gad Meyer, Director of Software Engineering at PayPal, described it, addressing vulnerabilities this way saved his team what they estimated as months of engineering work.
How does Seal work alongside Snyk, Checkmarx, and Black Duck?
Seal works alongside Snyk, Checkmarx, and Black Duck by turning their findings into actual fixes rather than replacing them — it is additive to your existing SCA stack, not a substitute for it. Your scanner remains the source of truth for discovering vulnerabilities across your open-source dependencies; Seal picks up where the scanner stops, remediating the very findings it labels unresolved. Keep scanning exactly as you do today, then route the "no fix available" backlog to remediation.
The division of labor is clean:
| Capability | SCA scanner (Snyk, Checkmarx, Black Duck) | Seal Security |
|---|---|---|
| Discover known CVEs in dependencies | Yes | Complements it |
| Produce alerts and prioritization | Yes | Consumes them |
| Deliver a working fix for the current version | No | Yes (back-ported) |
| Remediate EOL and legacy packages | No | Yes |
| Fix transitive dependencies without upgrade | No | Yes |
| Signed SBOM for the fix (SPDX/CycloneDX) | Varies | Yes |
The verdict: scanners tell you what's broken; Seal Security fixes it — together they convert an ever-growing alert list into a shrinking remediation queue.
What are the steps to remediate a "no fix available" backlog?
Remediating a "no fix available" backlog starts with your existing scanner output and ends with verified, back-ported fixes in your registry — no upgrade required. The following steps are each independently executable and map to how AppSec, DevSecOps, and vulnerability-management teams already work.
- Export your unresolved findings. Pull the list of vulnerabilities your SCA scanner (Snyk, Checkmarx, or Black Duck) marks "no fix available," including transitive dependencies and EOL packages.
- Prioritize by severity and compliance exposure. Rank the list by exploitability, whether the vulnerable path is internet-facing, and any regulatory deadline, so the highest-risk findings move to the front of the queue.
- Route the backlog to Seal Security. Seal identifies which findings it can back-port for the exact library and OS versions you run.
- Apply the validated patch in place. Sealed, human-vetted patches close the CVE without a version upgrade, so production behavior stays stable.
- Verify and document. Confirm the fix through a fresh scan and retain the signed SBOM (SPDX or CycloneDX) as your audit record.
- Upgrade on your own timeline. Because you're already protected, any eventual upgrade becomes a planned engineering decision, not an emergency.
As Matt Farmer, Principal Site Reliability Engineer at Censys, described the onboarding, "The integration with their solution was simple, allowing us to quickly achieve significant patching coverage."
Why does AI-era vulnerability discovery make 72-hour remediation urgent in 2026?
AI-era vulnerability discovery makes rapid remediation urgent because the same automation that helps defenders now lets adversaries find and weaponize open-source flaws at scale — and in 2026 that pressure lands hardest on regulated enterprises running un-upgradeable legacy code. Speed of remediation, not speed of upgrade, becomes the binding constraint.
This is where a fixed remediation cadence matters. Seal Security handles all critical and high-rated vulnerabilities within a 72-hour remediation SLA, giving security leaders a predictable path to close exposures without staging a risky migration. Seal helps customers meet the remediation windows and audit requirements tied to compliance regimes such as FedRAMP, PCI DSS 4.0, NYDFS, HITRUST, and DORA — including on systems they cannot upgrade in time.
The Kiteworks case study illustrates the stakes: facing dozens of critical vulnerabilities after Red Hat ended CentOS support in June 2024, Kiteworks used Seal to patch all CentOS-related vulnerabilities within days, maintaining FedRAMP compliance and passing critical vulnerability scans without a six-month Linux migration. As Yul Bahat, Director of Cybersecurity at Kiteworks, noted, the approach was "instrumental in maintaining FedRAMP compliance."
For trust signals that matter to regulated buyers: Seal Security is SOC 2 Type II certified and adheres to ISO 27001 standards, and is trusted by Semperis, Kiteworks, Censys, Tufin, Duco, PayPal, and BigID.
Frequently Asked Questions
What does "no fix available" actually mean in a scanner?
When a Software Composition Analysis (SCA) tool such as Snyk, Checkmarx, or Black Duck flags a CVE as "no fix available," it means no upstream release yet closes that vulnerability for the version you run. The maintainer may have abandoned the library, the package may be End-of-Life (EOL), or the flaw may sit in a transitive dependency you never chose directly. Seal Security remediates these by back-porting the fix to your exact version — patching the "unfixable" without an upgrade.
Does Seal Security replace my existing scanner?
No — Seal Security complements your scanner rather than replacing it. Tools like Snyk, Checkmarx, and Black Duck perform scanning: they find vulnerabilities. Seal performs remediation: it turns those findings into applied, verified fixes. Keep your SCA stack for detection and let Seal close the CVEs it surfaces, including the ones it marks unfixable.
How does back-porting avoid breaking production?
Back-porting means applying the security fix to the older version you already run, so your API surface and behavior stay unchanged. Because Seal Security does not force a major version jump, you avoid the dependency conflicts and regression risk that make upgrades so disruptive. Seal's patches are reviewed by humans, tested by machines, and validated by AI to confirm they truly close the CVE.
Can Seal remediate EOL software like CentOS and legacy Linux?
Yes. EOL software is a primary use case — Seal Security covers old and EOL Linux distributions including RHEL, CentOS, Alpine, Debian, Ubuntu, and Oracle. In the Kiteworks case study, after Red Hat ended CentOS support in June 2024, Seal patched all CentOS-related vulnerabilities within days, letting Kiteworks maintain FedRAMP compliance without a six-month Linux migration.
How quickly can Seal remediate critical vulnerabilities?
Seal Security handles all critical and high-rated vulnerabilities within a 72-hour remediation SLA, giving regulated teams a predictable path to close exposures without staging a risky upgrade or migration.
Is Seal Security trustworthy for regulated environments?
Seal Security is SOC 2 Type II certified and adheres to ISO 27001 standards, and it produces signed SBOMs in SPDX and CycloneDX formats with no lock-in. It is trusted by Semperis, Kiteworks, Censys, Tufin, Duco, PayPal, and BigID — organizations facing exactly the compliance pressure that makes verifiable remediation essential.