diff --git a/bake/hcl_test.go b/bake/hcl_test.go
index ac507a9b..7ee8a259 100644
--- a/bake/hcl_test.go
+++ b/bake/hcl_test.go
@@ -608,7 +608,7 @@ func TestHCLAttrsCapsuleType(t *testing.T) {
 	target "app" {
 		attest = [
 			{ type = "provenance", mode = "max" },
-			"type=sbom,disabled=true",
+			"type=sbom,disabled=true,generator=foo,\"ENV1=bar,baz\",ENV2=hello",
 		]
 
 		cache-from = [
@@ -641,7 +641,7 @@ func TestHCLAttrsCapsuleType(t *testing.T) {
 	require.NoError(t, err)
 
 	require.Equal(t, 1, len(c.Targets))
-	require.Equal(t, []string{"type=provenance,mode=max", "type=sbom,disabled=true"}, stringify(c.Targets[0].Attest))
+	require.Equal(t, []string{"type=provenance,mode=max", "type=sbom,disabled=true,\"ENV1=bar,baz\",ENV2=hello,generator=foo"}, stringify(c.Targets[0].Attest))
 	require.Equal(t, []string{"type=local,dest=../out", "type=oci,dest=../out.tar"}, stringify(c.Targets[0].Outputs))
 	require.Equal(t, []string{"type=local,src=path/to/cache", "user/app:cache"}, stringify(c.Targets[0].CacheFrom))
 	require.Equal(t, []string{"type=local,dest=path/to/cache"}, stringify(c.Targets[0].CacheTo))
diff --git a/util/buildflags/attests_test.go b/util/buildflags/attests_test.go
index c18545f2..6e2c942f 100644
--- a/util/buildflags/attests_test.go
+++ b/util/buildflags/attests_test.go
@@ -13,16 +13,21 @@ func TestAttests(t *testing.T) {
 		attests := Attests{
 			{Type: "provenance", Attrs: map[string]string{"mode": "max"}},
 			{Type: "sbom", Disabled: true},
+			{Type: "sbom", Attrs: map[string]string{
+				"generator": "scanner",
+				"ENV1":      `"foo,bar"`,
+				"Env2":      "hello",
+			}},
 		}
 
-		expected := `[{"type":"provenance","mode":"max"},{"type":"sbom","disabled":true}]`
+		expected := `[{"type":"provenance","mode":"max"},{"type":"sbom","disabled":true},{"ENV1":"\"foo,bar\"","Env2":"hello","generator":"scanner","type":"sbom"}]`
 		actual, err := json.Marshal(attests)
 		require.NoError(t, err)
 		require.JSONEq(t, expected, string(actual))
 	})
 
 	t.Run("UnmarshalJSON", func(t *testing.T) {
-		in := `[{"type":"provenance","mode":"max"},{"type":"sbom","disabled":true}]`
+		in := `[{"type":"provenance","mode":"max"},{"type":"sbom","disabled":true},{"ENV1":"\"foo,bar\"","Env2":"hello","generator":"scanner","type":"sbom"}]`
 
 		var actual Attests
 		err := json.Unmarshal([]byte(in), &actual)
@@ -31,6 +36,11 @@ func TestAttests(t *testing.T) {
 		expected := Attests{
 			{Type: "provenance", Attrs: map[string]string{"mode": "max"}},
 			{Type: "sbom", Disabled: true, Attrs: map[string]string{}},
+			{Type: "sbom", Disabled: false, Attrs: map[string]string{
+				"generator": "scanner",
+				"ENV1":      `"foo,bar"`,
+				"Env2":      "hello",
+			}},
 		}
 		require.Equal(t, expected, actual)
 	})
@@ -41,7 +51,14 @@ func TestAttests(t *testing.T) {
 				"type": cty.StringVal("provenance"),
 				"mode": cty.StringVal("max"),
 			}),
+			cty.ObjectVal(map[string]cty.Value{
+				"type":      cty.StringVal("sbom"),
+				"generator": cty.StringVal("scan"),
+				"ENV1":      cty.StringVal(`foo,bar`),
+				"Env2":      cty.StringVal(`hello`),
+			}),
 			cty.StringVal("type=sbom,disabled=true"),
+			cty.StringVal(`type=sbom,generator=scan,"FOO=bar,baz",Hello=World`),
 		})
 
 		var actual Attests
@@ -50,7 +67,17 @@ func TestAttests(t *testing.T) {
 
 		expected := Attests{
 			{Type: "provenance", Attrs: map[string]string{"mode": "max"}},
+			{Type: "sbom", Attrs: map[string]string{
+				"generator": "scan",
+				"ENV1":      "foo,bar",
+				"Env2":      "hello",
+			}},
 			{Type: "sbom", Disabled: true, Attrs: map[string]string{}},
+			{Type: "sbom", Attrs: map[string]string{
+				"generator": "scan",
+				"FOO":       "bar,baz",
+				"Hello":     "World",
+			}},
 		}
 		require.Equal(t, expected, actual)
 	})
@@ -59,6 +86,11 @@ func TestAttests(t *testing.T) {
 		attests := Attests{
 			{Type: "provenance", Attrs: map[string]string{"mode": "max"}},
 			{Type: "sbom", Disabled: true},
+			{Type: "sbom", Attrs: map[string]string{
+				"generator": "scan",
+				"ENV1":      `"foo,bar"`,
+				"Env2":      "hello",
+			}},
 		}
 
 		actual := attests.ToCtyValue()
@@ -71,6 +103,12 @@ func TestAttests(t *testing.T) {
 				"type":     cty.StringVal("sbom"),
 				"disabled": cty.StringVal("true"),
 			}),
+			cty.MapVal(map[string]cty.Value{
+				"type":      cty.StringVal("sbom"),
+				"generator": cty.StringVal("scan"),
+				"ENV1":      cty.StringVal(`"foo,bar"`),
+				"Env2":      cty.StringVal("hello"),
+			}),
 		})
 
 		result := actual.Equals(expected)