diff --git a/src/wallets/solana/solanaClient.test.ts b/src/wallets/solana/solanaClient.test.ts
new file mode 100644
index 000000000..90c3190de
--- /dev/null
+++ b/src/wallets/solana/solanaClient.test.ts
@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest'
+
+import { UserInputValidationError } from '../../errors'
+import { SolanaClient } from './solanaClient'
+
+describe('SolanaClient.importAccount', () => {
+  it('rejects odd-length hex private keys before encryption', async () => {
+    const client = new SolanaClient()
+
+    await expect(
+      client.importAccount({ privateKey: `0x${'a'.repeat(63)}` }),
+    ).rejects.toThrow(UserInputValidationError)
+    await expect(
+      client.importAccount({ privateKey: `0x${'a'.repeat(63)}` }),
+    ).rejects.toThrow(
+      'Private key hex string must contain an even number of characters',
+    )
+  })
+})
diff --git a/src/wallets/solana/solanaClient.ts b/src/wallets/solana/solanaClient.ts
index f36caa6bc..d90331df0 100644
--- a/src/wallets/solana/solanaClient.ts
+++ b/src/wallets/solana/solanaClient.ts
@@ -225,9 +225,19 @@ export class SolanaClient {
       if (!/^[0-9a-fA-F]+$/.test(hex)) {
         throw new UserInputValidationError('Invalid hex string')
       }
+      if (hex.length % 2 !== 0) {
+        throw new UserInputValidationError(
+          'Private key hex string must contain an even number of characters',
+        )
+      }
       privateKeyBytes = Uint8Array.from(Buffer.from(hex, 'hex'))
     } else if (/^[0-9a-fA-F]+$/.test(options.privateKey)) {
       // Hex format without prefix
+      if (options.privateKey.length % 2 !== 0) {
+        throw new UserInputValidationError(
+          'Private key hex string must contain an even number of characters',
+        )
+      }
       privateKeyBytes = Uint8Array.from(Buffer.from(options.privateKey, 'hex'))
     } else {
       // Assume base58 format (standard Solana format)