From 7bd14a28873e9d02715ec1bc76d5fd3ba053cbf0 Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@zoso.dev>
Date: Mon, 4 Aug 2025 06:48:42 -0700
Subject: [PATCH] Validate mnemonic input type and format.

---
 src/lib/bip39-mnemonic.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/lib/bip39-mnemonic.ts b/src/lib/bip39-mnemonic.ts
index 7265c02..1305a39 100644
--- a/src/lib/bip39-mnemonic.ts
+++ b/src/lib/bip39-mnemonic.ts
@@ -87,7 +87,14 @@ export class Bip39Mnemonic {
 	* @param {string} mnemonic - Mnemonic phrase to validate
 	* @returns {boolean} True if the mnemonic phrase is valid
 	*/
-	static async validate (mnemonic: string): Promise<boolean> {
+	static async validate (mnemonic: string): Promise<boolean>
+	static async validate (mnemonic: unknown): Promise<boolean> {
+		if (typeof mnemonic !== 'string') {
+			return false
+		}
+		if (!/^(?:[a-z]{3,8} ){11,23}[a-z]{3,8}$/i.test(mnemonic)) {
+			return false
+		}
 		const words = mnemonic.normalize('NFKD').split(' ')
 		if (words.length % 3 !== 0) {
 			return false
-- 
2.47.3