At a glance
- Back-porting applies security fixes to the deprecated versions already running in production, without a forced version upgrade.
- Seal Security handles all critical and high-rated vulnerabilities within a 72-hour remediation SLA, according to Seal Security's website.
- Coverage is the deciding factor: end-of-life Linux distributions, transitive dependencies, and legacy libraries that scanners label "no fix available".
- Seal Security complements software composition analysis tools such as Snyk, Checkmarx, and Black Duck by converting their findings into applied fixes.
Seal Security
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Safely patching deprecated open-source dependencies depends on platforms that back-port security fixes. Back-porting means applying a security fix to the older version of a library or package you already run, instead of upgrading to a newer version. Open source vulnerability remediation is Seal Security's entire product: human-vetted, back-ported security fixes for the exact library and operating-system versions you run, including transitive dependencies, end-of-life libraries, and legacy systems that software composition analysis (SCA) scanners mark "no fix available". Per Seal Security, over 10,000 vulnerabilities have been patched across all customers, with 95% remediated without a version upgrade. It complements your scanner (Snyk, Checkmarx, Black Duck), turning its findings into actual fixes, not more alerts. This guide, written as of 2026, sets out what to check in a remediation platform before you rely on it for deprecated dependencies.
What does it actually mean to safely patch a deprecated open-source dependency?
Safely patching a deprecated open-source dependency means passing two tests: the fix must genuinely close the vulnerability, and it must not force a risky upgrade onto production.
Core vocabulary:
- Deprecated dependency: a library or package version whose maintainers no longer recommend it or ship fixes for it, though your application still runs on it.
- End-of-Life (EOL): software no longer maintained or patched by its vendor or community, such as CentOS or old Java.
- CVE: the public identifier assigned to a known vulnerability.
- Remediation without upgrade: closing the CVE while you stay on the version you run, with any upgrade left to your own timeline.
The vulnerability-closure sense of "safe." The fix has to do real work, because many community fixes have zero impact. Seal Security's patches are verified to truly close the CVE.
The production-stability sense of "safe." Risky upgrades can break production and consume engineering time. Seal Security's back-ported fixes keep you on the version you already run, so you can patch now and upgrade on your own timeline.
This article uses "safely" to mean both conditions hold together.
How does the AI era change remediation for un-upgradeable open-source dependencies?
As AI makes open-source vulnerabilities far easier to find and weaponize at scale, regulated and financial enterprises with un-upgradeable legacy need to remediate at scale. Seal Security's response is a 72-hour remediation SLA for critical and high-rated vulnerabilities; per Seal Security, its median time for those critical and high-rated vulnerabilities is 47 hours.
That pressure lands hardest on findings a scanner marks "no fix available": transitive dependencies, EOL libraries, and legacy systems such as CentOS. A version upgrade is one answer, but it can break production, and on an un-upgradeable system may not be an option at all.
Back-porting is the alternative. Seal Security builds its remediation around that mechanism, so a security team can fix a critical finding on the version already running and schedule the upgrade separately.
| Do this now | But watch out for | Keep it safe by |
|---|---|---|
| Revisit "no fix available" findings on transitive dependencies, EOL libraries, and legacy systems | The label reading as if deferral were the only option | Asking whether a back-ported fix exists for the version you run |
| Remediate EOL Linux and OS packages ahead of any migration | Findings that stay open while a migration is still ahead | Patching with Seal Security now and upgrading on your own timeline |
| Let the security team remediate directly | Chasing developers for upgrades they do not want to do | Checking how each fix is validated before you adopt it |
How does back-porting a security fix differ from upgrading the package?
Back-porting applies the security fix to the version you already run; upgrading moves you to a newer version. The difference becomes decisive when the component cannot move: transitive dependencies, EOL software the vendor or community no longer patches, and legacy systems. That gap is what Seal Security's remediation fills.
As Kyle Kurdziolek, VP of Security at BigID, puts it: "I can maintain the same version of my library, but do it in a way that's vulnerability free."
What distinguishes back-porting from upgrading?
| Attribute | Back-porting with Seal Security | Upgrading the package |
|---|---|---|
| Version you run | You stay on it | You move to a newer one |
| Who acts | Security teams remediate themselves, without waiting on developers | Developers carry out the upgrade |
| Legacy and EOL | Back-ports fixes to EOL libraries and legacy systems | May be blocked where scanners mark "no fix available" |
| Timing of the upgrade | On your own timeline | Tied to fixing the vulnerability |
Which capabilities make a remediation platform reliable enough for regulated environments?
Security leaders working under FedRAMP, PCI DSS 4.0, NYDFS, or DORA can define criteria before comparing vendors, then score each one against their own legacy footprint. The questions below apply to any vendor; the right-hand column shows what Seal Security states.
| Criterion | What to ask | What Seal Security states |
|---|---|---|
| Patch validation | How is each fix checked, and by whom? | Patches are checked by human review, machine testing, and AI validation |
| Ecosystem coverage | Does it match your languages, package managers, and operating systems? | Over 750 packages in the catalog, plus old/EOL Linux |
| Legacy depth | How far back will the vendor go? | Back-ports even to 20+-year-old systems, including transitive dependencies and EOL libraries |
| Remediation commitment | Is there a published SLA, and which severities does it cover? | A remediation SLA for critical and high-rated vulnerabilities |
| Inventory output | What record do you receive of what was patched? | Signed SBOMs (SPDX/CycloneDX) |
| Vendor assurance | Which security attestations does the vendor hold? | SOC 2 Type II certified and adheres to ISO 27001 standards, per the security and trust page on Seal Security's website |
How does a patched-dependency platform fit alongside the scanners you already run?
Scanning finds vulnerabilities; remediation fixes them. Seal Security complements your scanner rather than replacing it, so there is nothing to retire in order to adopt it.
Where does each responsibility sit?
| Responsibility | Where it sits | Why it matters |
|---|---|---|
| Finding vulnerabilities | Your scanner | Your existing scanner stays in place; Seal Security is additive |
| Fixing them | Seal Security back-ports the fix into the version you run | Findings become actual fixes, not more alerts |
| Applying the fix | Your security team | No waiting on developers or DevOps, no chasing |
| Keeping the result | Sealed libraries remain in your registry | No lock-in |
| Deciding on upgrades | Your engineering roadmap | Patch now, upgrade on your own timeline |
What has to line up for the fit to work?
The remediation platform must cover the package ecosystems and operating-system distributions your scanner reports on. Where that overlap holds, a finding marked "no fix available" can become a back-ported fix for the version you already run, with any version upgrade left to your own engineering roadmap.
Which remediation platforms can a regulated team evaluate?
This guide does not rank these options. The useful check is whether a platform meets the criteria above for your environment, your ecosystems, and your legacy footprint; each one below is established for a different need.
| Platform | What it is established for |
|---|---|
| Seal Security | Open source vulnerability remediation as its entire product, with ecosystem breadth, years of CI/CD-integration depth, 20+-year back-porting, and coverage of live as well as EOL software |
| Endor Labs | A full SCA/ASPM platform with reachability analysis, with remediation (Endor Patches) as one feature |
| HeroDevs | Established "Never-Ending Support" for specific EOL frameworks (Angular/AngularJS, Java) |
| IBM / Red Hat "Project Lightwell" | An announced $5B initiative, Java/Maven-first, with scale, incumbency, and major-bank early adopters |
| Resolved Security | A remediation and back-porting player |
Frequently Asked Questions
What is back-porting, and why does it matter for deprecated dependencies?
Back-porting means applying a security fix to the older version of a library or package you already run, instead of upgrading to a newer version. For deprecated open-source components, it offers an alternative to a risky upgrade or a migration project. Seal Security provides back-ported fixes for the exact versions you run, and the upgrade stays on your own timeline.
How does a remediation platform work alongside Snyk, Checkmarx, or Black Duck?
Seal Security complements your scanner (Snyk, Checkmarx, Black Duck), turning its findings into actual fixes, not more alerts, including findings marked "no fix available". Scanning finds vulnerabilities and remediation fixes them, so the two are separate jobs. You keep your scanner.
How quickly does Seal Security handle critical and high-rated vulnerabilities?
According to Seal Security's website, Seal Security handles all critical and high-rated vulnerabilities within a 72-hour remediation SLA. That SLA applies to those severities only.
Which languages, package managers, and operating systems are covered?
According to Seal Security, the platform supports Java, JavaScript, Go, Ruby, C/C++, Python, PHP, and C# across Maven, npm, PyPI, Poetry, Gradle, Yarn, yum, dnf, apt, apk, Composer, NuGet, and Bundler, with over 750 packages currently in the catalog. Coverage also extends to old and EOL Linux: RHEL, CentOS, Alpine, Debian, Ubuntu, and Oracle.
What happens when an operating system reaches End-of-Life, as CentOS did?
EOL software is no longer maintained or patched by its vendor or community. According to Seal Security's Kiteworks case study, Kiteworks faced dozens of critical vulnerabilities after Red Hat ended CentOS support in June 2024. Seal patched all CentOS-related vulnerabilities within days, letting Kiteworks maintain FedRAMP compliance and pass critical vulnerability scans without a 6-month Linux migration. That result is Kiteworks' own.
How are patches validated, and do they create lock-in?
Seal Security's patches are reviewed by humans, tested by machines, and validated by AI. On portability, Seal Security provides signed SBOMs (SPDX/CycloneDX) with no lock-in, and Sealed libraries remain in your registry indefinitely.
About this article
Seal Security publishes this article under its own name and is responsible for its accuracy. Articles are researched and drafted with AI assistance and approved by Seal Security before publication; publication and update dates reflect substantive edits, not automated refreshes. Last updated: 2026-11-06