diff --git a/crypto/pubkey/rsa_pub.c b/crypto/pubkey/rsa_pub.c
index f1d57e0..fa36e42 100644
--- a/crypto/pubkey/rsa_pub.c
+++ b/crypto/pubkey/rsa_pub.c
@@ -63,6 +63,12 @@ int32_t psRsaDecryptPubExt(psPool_t *pool,
         return PS_ARG_FAIL;
     }
 
+    if (*outlen < key->size)
+    {
+        psTraceCrypto("Error on bad outlen parameter to psRsaDecryptPub\n");
+        return PS_ARG_FAIL;
+    }
+
     ptLen = inlen;
 
     /* Raw, in-place RSA decryption. */