diff --git a/src/index.test.js b/src/index.test.js
index 2bf1e23..120ad17 100644
--- a/src/index.test.js
+++ b/src/index.test.js
@@ -1,5 +1,6 @@
 import { describe, it, expect } from 'vitest';
 import formatDuration from '$lib/formatDuration';
+import { safePath } from '$lib/server/safePath';
 
 describe('formatDuration test', () => {
     it('converts 120 seconds to "2:00"', () => {
@@ -21,4 +22,26 @@ describe('formatDuration test', () => {
     it('converts 3601 seconds to "1:00:01"', () => {
         expect(formatDuration(3601)).toBe('1:00:01');
     });
+});
+
+describe('safePath test', () => {
+    const base = "data/subdir";
+    it('rejects empty string', () => {
+        expect(safePath('', { base })).toBe(null);
+    });
+    it('accepts a regular path', () => {
+        expect(safePath('subsubdir/file.txt', { base })).toBe('data/subdir/subsubdir/file.txt');
+    });
+    it('rejects path with ..', () => {
+        expect(safePath('../file.txt', { base })).toBe(null);
+    });
+    it('accepts path with .', () => {
+        expect(safePath('./file.txt', { base })).toBe('data/subdir/file.txt');
+    });
+    it('accepts path traversal within base', () => {
+        expect(safePath('subsubdir/../file.txt', { base })).toBe('data/subdir/file.txt');
+    });
+    it('rejects path with subdir if noSubDir is true', () => {
+        expect(safePath('subsubdir/file.txt', { base, noSubDir: true })).toBe(null);
+    });
 });
\ No newline at end of file
diff --git a/src/lib/server/database/loadData.ts b/src/lib/server/database/loadData.ts
index ad1848a..ff5e610 100644
--- a/src/lib/server/database/loadData.ts
+++ b/src/lib/server/database/loadData.ts
@@ -1,6 +1,7 @@
 import fs from 'fs';
 import { globalMemoryStorage, songData, songNameCache } from '$lib/server/cache.js';
 import { getDirectoryHash } from '../dirHash';
+import { safePath } from '../safePath';
 
 const dataPath = './data/song/';
 
@@ -25,7 +26,12 @@ export async function loadData() {
     songNameCache.flushAll();
     for (const songID of songList) {
         try {
-            const fileContentString = fs.readFileSync(dataPath + songID + '.json').toString();
+            const normPath = safePath(songID + '.json', { base: dataPath });
+            if (!normPath) {
+                console.error(`[load-song-data] Invalid path for song ID ${songID}`);
+                continue;
+            }
+            const fileContentString = fs.readFileSync(normPath).toString();
             const data = JSON.parse(fileContentString);
             songData.set(songID, data);
             const metadata: MusicMetadata = data;
diff --git a/src/lib/server/dirHash.ts b/src/lib/server/dirHash.ts
index 856ca5c..19ef295 100644
--- a/src/lib/server/dirHash.ts
+++ b/src/lib/server/dirHash.ts
@@ -12,7 +12,7 @@ export function getDirectoryHash(dir: string): string {
 
         files.forEach(file => {
             const filePath = path.join(currentDir, file);
-            const stats = fs.statSync(filePath);
+            const stats = fs.lstatSync(filePath);
 
             if (stats.isDirectory()) {
                 traverseDirectory(filePath);
@@ -30,7 +30,7 @@ export function getDirectoryHash(dir: string): string {
 
     // Create hash from file details
     const hash = crypto.createHash('sha256');
-    hash.update(fileDetails.join('|'));
+    hash.update(fileDetails.join('\x00'));
 
     return hash.digest('hex');
 }
\ No newline at end of file
diff --git a/src/lib/server/safePath.ts b/src/lib/server/safePath.ts
new file mode 100644
index 0000000..52dc095
--- /dev/null
+++ b/src/lib/server/safePath.ts
@@ -0,0 +1,22 @@
+import path from 'path';
+
+export function safePath(pathIn: string, options: { base: string, noSubDir?: boolean }): string | null {
+    const base = options.base.endsWith('/') ? options.base : options.base + '/';
+    if (!pathIn.startsWith("./")) {
+        pathIn = "./" + pathIn;
+    }
+    pathIn = path.join(base, pathIn);
+    const normBase = path.normalize(base);
+    const normPath = path.normalize(pathIn);
+
+    if (normPath !== normBase && normPath.startsWith(normBase)) {
+        if (options.noSubDir) {
+            let rel = path.relative(normBase, normPath);
+            if (rel.indexOf(path.sep) !== -1) {
+                return null;
+            }
+        }
+        return normPath;
+    }
+    return null;
+}
\ No newline at end of file
diff --git a/src/routes/api/database/song/[id]/+server.ts b/src/routes/api/database/song/[id]/+server.ts
index c546949..7b03ee5 100644
--- a/src/routes/api/database/song/[id]/+server.ts
+++ b/src/routes/api/database/song/[id]/+server.ts
@@ -1,31 +1,43 @@
+import { safePath } from '$lib/server/safePath';
 import { getCurrentFormattedDateTime } from '$lib/songUpdateTime';
 import { json, error } from '@sveltejs/kit';
 import fs from 'fs';
 import type { RequestHandler } from './$types';
 
 export const GET: RequestHandler = async ({ params }) => {
-    const filePath = `./data/song/${params.id}.json`;
-    if (!fs.existsSync(filePath)) {
+    const filePath = safePath(`${params.id}.json`, { base: './data/song' });
+    if (!filePath) {
+        return error(404, {
+            message: "No correspoding song."
+        });
+    }
+    let data;
+    try { data = fs.readFileSync(filePath); } catch (e) {
         return error(404, {
             message: "No corresponding song."
-        })
+        });
     }
-    const data = fs.readFileSync(filePath);
-	return json(JSON.parse(data.toString()));
+    return json(JSON.parse(data.toString()));
 }
 
 export const POST: RequestHandler = async ({ request, params }) => {
     const timeStamp = new Date().getTime();
-    if (!fs.existsSync("./data/pending/")) {
-        fs.mkdirSync("./data/pending");
+    try {
+        if (!fs.existsSync("./data/pending/")) {
+            fs.mkdirSync("./data/pending", { mode: 0o755 });
+        }
+        const filePath = `./data/pending/${params.id}-${timeStamp}.json`;
+        const data: MusicMetadata = await request.json();
+        data.updateTime = getCurrentFormattedDateTime();
+        fs.writeFileSync(filePath, JSON.stringify(data, null, 4), { mode: 0o644 });
+        return json({
+            "message": "successfully created"
+        }, {
+            status: 201
+        });
+    } catch (e) {
+        return error(500, {
+            message: "Internal server error."
+        });
     }
-    const filePath = `./data/pending/${params.id}-${timeStamp}.json`;
-    const data: MusicMetadata = await request.json();
-    data.updateTime = getCurrentFormattedDateTime();
-    fs.writeFileSync(filePath, JSON.stringify(data, null, 4));
-    return json({
-        "message": "successfully created"
-    }, {
-        status: 201
-    });
 }
\ No newline at end of file
diff --git a/src/routes/database/edit/[id]/+page.server.ts b/src/routes/database/edit/[id]/+page.server.ts
index 0699ca2..ce0f590 100644
--- a/src/routes/database/edit/[id]/+page.server.ts
+++ b/src/routes/database/edit/[id]/+page.server.ts
@@ -1,22 +1,21 @@
-import type { PageServerLoad } from './$types';
 import fs from 'fs';
-
+import type { PageServerLoad } from './$types';
+import { safePath } from '$lib/server/safePath';
 
 export const load: PageServerLoad = ({ params }) => {
-    const filePath = `./data/song/${params.id}.json`;
-    if (!fs.existsSync(filePath)) {
+    const filePath = safePath(`${params.id}.json`, { base: './data/song' });
+    if (!filePath) {
         return {
             songData: null
-        }
+        };
     }
-    const dataBuffer = fs.readFileSync(filePath);
     try {
+        const dataBuffer = fs.readFileSync(filePath);
         const data = JSON.parse(dataBuffer.toString());
         return {
             songData: data
         };
-    }
-    catch {
+    } catch {
         return {
             songData: null
         }