diff --git a/packages/devframe/src/utils/serve-static.test.ts b/packages/devframe/src/utils/serve-static.test.ts
index f2797be5..24ed9b08 100644
--- a/packages/devframe/src/utils/serve-static.test.ts
+++ b/packages/devframe/src/utils/serve-static.test.ts
@@ -6,7 +6,7 @@ import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { H3, toNodeHandler } from 'h3'
 import { afterEach, describe, expect, it } from 'vitest'
-import { serveStaticHandler, serveStaticNodeMiddleware } from './serve-static'
+import { mountStaticHandler, serveStaticHandler, serveStaticNodeMiddleware } from './serve-static'
 
 interface Fixture {
   dir: string
@@ -167,6 +167,55 @@ describe('serveStaticHandler', () => {
   })
 })
 
+describe('mountStaticHandler', () => {
+  it('serves files when mounted at the root', async () => {
+    const dir = makeTmp('devframe-serve-root-')
+    writeFileSync(join(dir, 'index.html'), 'root-index', 'utf-8')
+    writeFileSync(join(dir, 'app.js'), 'root-app', 'utf-8')
+
+    const app = new H3()
+    mountStaticHandler(app, '/', dir)
+
+    const indexResponse = await app.request('/')
+    const assetResponse = await app.request('/app.js')
+    const missingResponse = await app.request('/missing.js')
+
+    expect(indexResponse.status).toBe(200)
+    expect(await indexResponse.text()).toBe('root-index')
+    expect(assetResponse.status).toBe(200)
+    expect(await assetResponse.text()).toBe('root-app')
+    expect(missingResponse.status).toBe(404)
+  })
+
+  it('keeps static bases with overlapping prefixes isolated', async () => {
+    const viteDir = makeTmp('devframe-serve-vite-')
+    const vitestDir = makeTmp('devframe-serve-vitest-')
+    writeFileSync(join(viteDir, 'index.html'), 'vite-index', 'utf-8')
+    writeFileSync(join(viteDir, 'favicon.svg'), 'vite', 'utf-8')
+    writeFileSync(join(vitestDir, 'favicon.svg'), 'vitest', 'utf-8')
+
+    const app = new H3()
+    mountStaticHandler(app, '/__devtools-vite/', viteDir)
+    mountStaticHandler(app, '/__devtools-vitest/', vitestDir)
+
+    const viteBaseResponse = await app.request('/__devtools-vite')
+    const viteBaseSlashResponse = await app.request('/__devtools-vite/')
+    const viteResponse = await app.request('/__devtools-vite/favicon.svg')
+    const vitestResponse = await app.request('/__devtools-vitest/favicon.svg')
+    const adjacentResponse = await app.request('/__devtools-vite-extra/favicon.svg')
+
+    expect(viteBaseResponse.status).toBe(200)
+    expect(await viteBaseResponse.text()).toBe('vite-index')
+    expect(viteBaseSlashResponse.status).toBe(200)
+    expect(await viteBaseSlashResponse.text()).toBe('vite-index')
+    expect(viteResponse.status).toBe(200)
+    expect(await viteResponse.text()).toBe('vite')
+    expect(vitestResponse.status).toBe(200)
+    expect(await vitestResponse.text()).toBe('vitest')
+    expect(adjacentResponse.status).toBe(404)
+  })
+})
+
 describe('serveStaticNodeMiddleware', () => {
   let fx: Fixture | undefined
 
diff --git a/packages/devframe/src/utils/serve-static.ts b/packages/devframe/src/utils/serve-static.ts
index a555e906..2b71a589 100644
--- a/packages/devframe/src/utils/serve-static.ts
+++ b/packages/devframe/src/utils/serve-static.ts
@@ -1,9 +1,9 @@
-import type { EventHandler, H3 } from 'h3'
+import type { EventHandler } from 'h3'
 import type { IncomingMessage, ServerResponse } from 'node:http'
 import { createReadStream } from 'node:fs'
 import { stat } from 'node:fs/promises'
 import { Readable } from 'node:stream'
-import { defineHandler, withBase } from 'h3'
+import { defineHandler, H3 } from 'h3'
 import { lookup } from 'mrmime'
 import { extname, join, normalize, resolve, sep } from 'pathe'
 
@@ -168,13 +168,11 @@ export function serveStaticHandler(
 }
 
 /**
- * Mount {@link serveStaticHandler} on an h3 app at `base`, handling the
- * route pattern and prefix-stripping required by h3 v2.
+ * Mount {@link serveStaticHandler} on an h3 app at `base`.
  *
- * h3 v2's `app.use(base, handler)` only matches the exact `base` path and
- * does not strip the prefix from `event.url.pathname`. Static serving
- * needs both subpath matching (`/base/**`) and the URL stripped so the
- * file resolver sees paths relative to `dir` — this helper bundles both.
+ * h3's sub-app mount provides segment-boundary matching and strips `base`
+ * from `event.url.pathname`, so the file resolver sees paths relative to
+ * `dir`.
  */
 export function mountStaticHandler(
   app: H3,
@@ -182,13 +180,9 @@ export function mountStaticHandler(
   dir: string,
   options?: ServeStaticOptions,
 ): void {
-  const trimmed = base.replace(/\/$/, '')
-  const handler = serveStaticHandler(dir, options)
-  if (trimmed === '') {
-    app.use('/**', handler)
-    return
-  }
-  app.use(`${trimmed}/**`, withBase(trimmed, handler))
+  const staticApp = new H3()
+  staticApp.use(serveStaticHandler(dir, options))
+  app.mount(base.replace(/\/$/, ''), staticApp)
 }
 
 /**