diff --git a/go/go.mod b/go/go.mod
index 68638c04e30..65d59972f02 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -23,7 +23,7 @@ require (
 	github.com/klauspost/compress v1.20.0
 	github.com/microcosm-cc/bluemonday v1.0.27
 	github.com/nikolalohinski/gonja/v2 v2.9.0
-	github.com/ossf/osv-schema/bindings/go v0.0.0-20260902031056-b388a18021a3
+	github.com/ossf/osv-schema/bindings/go v0.0.0-20260924053548-8e3305dedc07
 	github.com/package-url/packageurl-go v0.1.7
 	github.com/pandatix/go-cvss v0.6.4
 	github.com/prometheus/client_golang v1.24.1
diff --git a/go/go.sum b/go/go.sum
index 75b765b290f..3473da2ef0a 100644
--- a/go/go.sum
+++ b/go/go.sum
@@ -235,6 +235,8 @@ github.com/onsi/gomega v1.37.0 h1:CdEG8g0S133B4OswTDC/5XPSzE1OeP29QOioj2PID2Y=
 github.com/onsi/gomega v1.37.0/go.mod h1:8D9+Txp43QWKhM24yyOBEdpkzN8FvJyAwecBgsU4KU0=
 github.com/ossf/osv-schema/bindings/go v0.0.0-20260902031056-b388a18021a3 h1:mNqW4tPTIPcx3KL5qZCByAHiTwGcwD/eCEfKOEvLA4g=
 github.com/ossf/osv-schema/bindings/go v0.0.0-20260902031056-b388a18021a3/go.mod h1:aW9XJyUJfg0r+HogMGMagTt4hF6ibBkH/FZenG/KiyE=
+github.com/ossf/osv-schema/bindings/go v0.0.0-20260924053548-8e3305dedc07 h1:iSGN4UeIRS7B8jKaOsisArXvD7poOLUgEwcAIHuvTC4=
+github.com/ossf/osv-schema/bindings/go v0.0.0-20260924053548-8e3305dedc07/go.mod h1:aW9XJyUJfg0r+HogMGMagTt4hF6ibBkH/FZenG/KiyE=
 github.com/package-url/packageurl-go v0.1.7 h1:iFWg6tzAjLA6F/qX3M5nZaiMHJgc+p2zxVyr/fY+sZY=
 github.com/package-url/packageurl-go v0.1.7/go.mod h1:nKAWB8E6uk1MHqiS/lQb9pYBGH2+mdJ2PJc2s50dQY0=
 github.com/pandatix/go-cvss v0.6.4 h1:9w2RCO/Q4UTiJyEgpCHRiVc6CfrsFEnkoX+OtATqKio=
diff --git a/go/osv/ecosystem/ecosystem.go b/go/osv/ecosystem/ecosystem.go
index 9ae50baf1a5..18b6dfd2423 100644
--- a/go/osv/ecosystem/ecosystem.go
+++ b/go/osv/ecosystem/ecosystem.go
@@ -70,6 +70,7 @@ var ecosystems = map[osvconstants.Ecosystem]ecosystemFactory{
 	osvconstants.EcosystemPub:                        func(p *Provider, _ string) Ecosystem { return pubEcosystem{p: p} },
 	osvconstants.EcosystemPyPI:                       func(p *Provider, _ string) Ecosystem { return pypiEcosystem{p: p} },
 	osvconstants.EcosystemRedHat:                     statelessFactory[rpmEcosystem],
+	osvconstants.EcosystemRedHatLightwell:            redHatLightwellFactory,
 	osvconstants.EcosystemRockyLinux:                 statelessFactory[rpmEcosystem],
 	osvconstants.EcosystemRoot:                       rootEcosystemFactory,
 	osvconstants.EcosystemRubyGems:                   func(p *Provider, _ string) Ecosystem { return rubyGemsEcosystem{p: p} },
diff --git a/go/osv/ecosystem/red_hat_lightwell.go b/go/osv/ecosystem/red_hat_lightwell.go
new file mode 100644
index 00000000000..c0abf874953
--- /dev/null
+++ b/go/osv/ecosystem/red_hat_lightwell.go
@@ -0,0 +1,24 @@
+package ecosystem
+
+import (
+	"github.com/ossf/osv-schema/bindings/go/osvconstants"
+)
+
+// redHatLightwellFactory builds the Ecosystem for a "Red Hat Lightwell:<base>"
+// OSV ecosystem, e.g. "Red Hat Lightwell:Maven" or "Red Hat Lightwell:PyPI".
+//
+// Red Hat Lightwell republishes upstream artifacts carrying a backport version
+// marker (Maven ".rhlw-NNNNN", PyPI "+rhlw.N") that sorts within the base
+// ecosystem's own version space, so version semantics delegate to the base
+// ecosystem named by the ":" suffix. An unsupported suffix yields a nil
+// Ecosystem, which Provider.Get reports as "not found".
+func redHatLightwellFactory(p *Provider, suffix string) Ecosystem {
+	switch osvconstants.Ecosystem(suffix) {
+	case osvconstants.EcosystemMaven:
+		return mavenEcosystem{p: p}
+	case osvconstants.EcosystemPyPI:
+		return pypiEcosystem{p: p}
+	default:
+		return nil
+	}
+}
diff --git a/go/osv/ecosystem/red_hat_lightwell_test.go b/go/osv/ecosystem/red_hat_lightwell_test.go
new file mode 100644
index 00000000000..1083d21e252
--- /dev/null
+++ b/go/osv/ecosystem/red_hat_lightwell_test.go
@@ -0,0 +1,29 @@
+package ecosystem
+
+import (
+	"testing"
+)
+
+func TestRedHatLightwell_Get(t *testing.T) {
+	p := NewProvider(nil)
+
+	tests := []struct {
+		name  string
+		eco   string
+		found bool
+	}{
+		{"maven suffix delegates", "Red Hat Lightwell:Maven", true},
+		{"pypi suffix delegates", "Red Hat Lightwell:PyPI", true},
+		{"unsupported suffix", "Red Hat Lightwell:npm", false},
+		{"missing suffix", "Red Hat Lightwell", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			_, ok := p.Get(tt.eco)
+			if ok != tt.found {
+				t.Errorf("Get(%q) found = %v, want %v", tt.eco, ok, tt.found)
+			}
+		})
+	}
+}
diff --git a/go/purl/ecosystem_red_hat_lightwell.go b/go/purl/ecosystem_red_hat_lightwell.go
new file mode 100644
index 00000000000..b6b66bb9687
--- /dev/null
+++ b/go/purl/ecosystem_red_hat_lightwell.go
@@ -0,0 +1,39 @@
+package purl
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/ossf/osv-schema/bindings/go/osvconstants"
+	"github.com/package-url/packageurl-go"
+)
+
+//nolint:gochecknoinits // init is used here to register the ecosystem with the global PURL registry.
+func init() {
+	registerGenerator(osvconstants.EcosystemRedHatLightwell, generatorFunc(redHatLightwellGenerator))
+	// No reverse parser is registered on purpose: Red Hat Lightwell records carry
+	// pkg:maven / pkg:pypi PURLs, whose types are already owned by the Maven/PyPI
+	// parsers (registerParser panics on collision). PURL -> ecosystem resolution
+	// for Lightwell is done via explicit ecosystem queries rather than the shared
+	// pkg:maven/pkg:pypi types, which belong to the upstream ecosystems.
+}
+
+// redHatLightwellGenerator builds the PURL for a "Red Hat Lightwell:<base>"
+// package by delegating to the base ecosystem's registered generator, named by
+// the ":" suffix (e.g. "Red Hat Lightwell:Maven" -> pkg:maven, ":PyPI" -> pkg:pypi).
+func redHatLightwellGenerator(ecosystem, packageName string) (packageurl.PackageURL, error) {
+	_, suffix, _ := strings.Cut(ecosystem, ":")
+	base := osvconstants.Ecosystem(suffix)
+
+	switch base {
+	case osvconstants.EcosystemMaven, osvconstants.EcosystemPyPI:
+		gen, ok := generators[base]
+		if !ok {
+			return packageurl.PackageURL{}, fmt.Errorf("no PURL generator registered for base ecosystem %q", base)
+		}
+
+		return gen.generate(string(base), packageName)
+	default:
+		return packageurl.PackageURL{}, fmt.Errorf("unsupported Red Hat Lightwell ecosystem suffix %q", suffix)
+	}
+}
diff --git a/go/purl/ecosystem_red_hat_lightwell_test.go b/go/purl/ecosystem_red_hat_lightwell_test.go
new file mode 100644
index 00000000000..129c9a8ef25
--- /dev/null
+++ b/go/purl/ecosystem_red_hat_lightwell_test.go
@@ -0,0 +1,34 @@
+package purl
+
+import (
+	"testing"
+)
+
+func TestRedHatLightwellGenerate(t *testing.T) {
+	tests := []struct {
+		ecosystem   string
+		packageName string
+		want        string
+		wantErr     bool
+	}{
+		{"Red Hat Lightwell:Maven", "org.apache.commons:commons-lang3", "pkg:maven/org.apache.commons/commons-lang3", false},
+		{"Red Hat Lightwell:PyPI", "requests", "pkg:pypi/requests", false},
+		// Unsupported / missing suffix.
+		{"Red Hat Lightwell:npm", "foo", "", true},
+		{"Red Hat Lightwell", "foo", "", true},
+	}
+
+	for _, tt := range tests {
+		got, err := Generate(tt.ecosystem, tt.packageName)
+		if (err != nil) != tt.wantErr {
+			t.Errorf("Generate(%q, %q) error = %v, wantErr %v", tt.ecosystem, tt.packageName, err, tt.wantErr)
+			continue
+		}
+		if tt.wantErr {
+			continue
+		}
+		if got != tt.want {
+			t.Errorf("Generate(%q, %q) = %q, want %q", tt.ecosystem, tt.packageName, got, tt.want)
+		}
+	}
+}