diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5cc55c7f..17823827 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- CMCD does not protect against non-Finite numeric values [#45](https://github.com/streaming-video-technology-alliance/common-media-library/issues/45)
+
 
 ## [0.5.1] - 2023-11-16
 
diff --git a/lib/src/cta/utils/isValid.ts b/lib/src/cta/utils/isValid.ts
index a6f7183e..10fb12c4 100644
--- a/lib/src/cta/utils/isValid.ts
+++ b/lib/src/cta/utils/isValid.ts
@@ -1,3 +1,9 @@
 import { CmValue } from '../CmValue';
 
-export const isValid = (value: CmValue) => value != null && value !== '' && value !== false;
+export const isValid = (value: CmValue) => {
+	if (typeof value === 'number') {
+		return Number.isFinite(value);
+	}
+
+	return value != null && value !== '' && value !== false;
+};
diff --git a/lib/src/structuredfield/serialize/serializeBareItem.ts b/lib/src/structuredfield/serialize/serializeBareItem.ts
index 0a27c5ed..d5b444dc 100644
--- a/lib/src/structuredfield/serialize/serializeBareItem.ts
+++ b/lib/src/structuredfield/serialize/serializeBareItem.ts
@@ -39,6 +39,10 @@ import { serializeToken } from './serializeToken.js';
 export function serializeBareItem(value: any) {
 	switch (typeof value) {
 		case 'number':
+			if (!Number.isFinite(value)) {
+				throw serializeError(value, BARE_ITEM);
+			}
+
 			if (Number.isInteger(value)) {
 				return serializeInteger(value);
 			}
diff --git a/lib/test/cmcd/encodeCmcd.test.ts b/lib/test/cmcd/encodeCmcd.test.ts
index f52da3d5..0a457ad8 100644
--- a/lib/test/cmcd/encodeCmcd.test.ts
+++ b/lib/test/cmcd/encodeCmcd.test.ts
@@ -10,6 +10,11 @@ describe('encodeCmcd', () => {
 		equal(encodeCmcd(null as any), '');
 	});
 
+	it('ignore invalid values', () => {
+		// @ts-expect-error
+		equal(encodeCmcd({ mtp: NaN, br: Infinity, nor: '', sid: undefined, cid: null, su: false }), '');
+	});
+
 	it('returns encoded string', () => {
 		equal(encodeCmcd(CMCD_INPUT), CMCD_STRING);
 	});
diff --git a/lib/test/structuredfield/serializeBareItem.test.ts b/lib/test/structuredfield/serializeBareItem.test.ts
index 59268473..b109f50a 100644
--- a/lib/test/structuredfield/serializeBareItem.test.ts
+++ b/lib/test/structuredfield/serializeBareItem.test.ts
@@ -5,4 +5,6 @@ import { serializeBareItem } from '../../src/structuredfield/serialize/serialize
 test('serializeBareItem', () => {
 	assert.throws(() => serializeBareItem([]), /failed to serialize "\[\]" as Bare Item/);
 	assert.throws(() => serializeBareItem({}), /failed to serialize "{}" as Bare Item/);
+	assert.throws(() => serializeBareItem(NaN), /failed to serialize "NaN" as Bare Item/);
+	assert.throws(() => serializeBareItem(Infinity), /failed to serialize "Infinity" as Bare Item/);
 });