diff --git a/frontend/src/components/PkgLogo.vue b/frontend/src/components/PkgLogo.vue
index 29ceb68..839ec77 100644
--- a/frontend/src/components/PkgLogo.vue
+++ b/frontend/src/components/PkgLogo.vue
@@ -57,11 +57,15 @@ const style = computed(() => {
 // - 其他主页 → 域名根路径 /favicon.ico
 // 加载失败一律回退首字母徽标
 const imgOk = ref(false)
+const actualSrc = ref('')
+
 const faviconUrl = computed(() => {
   const hp = props.homepage
   if (!hp) return ''
   try {
     const u = new URL(hp)
+    // 过滤明显无效的 GitHub 子域名（如 epeli.github.com，正确应为 *.github.io）
+    if (u.hostname.endsWith('.github.com') && u.hostname !== 'www.github.com') return ''
     if (u.hostname === 'github.com' || u.hostname === 'www.github.com') {
       const m = hp.match(/^https?:\/\/(?:www\.)?github\.com\/([^/?#]+)\/[^/?#]+/)
       if (m) return `https://github.com/${m[1]}.png`
@@ -71,15 +75,62 @@ const faviconUrl = computed(() => {
     return ''
   }
 })
-watch(faviconUrl, () => { imgOk.value = false })
+
+// ===== 共享 URL 探测缓存（跨组件全局）=====
+// 策略：用 fetch(no-cors) 预检代替直接 img.src。
+// fetch 的网络层失败（DNS/连接/超时）不会涌入控制台红色报错；
+// 同 URL 所有组件实例共用一个 Promise，避免重复并发。
+// 404 等 no-cors 下 opaque resolve，由 img @error 兜底（少量且可控）。
+const _urlCache = new Map()   // url -> { ok, expires }
+const _urlPending = new Map() // url -> Promise<boolean>
+const TTL = 24 * 3600 * 1000  // 失败缓存 24h，避免反复探测已知的死链
+const PROBE_TIMEOUT = 8000    // 探测超时 8s
+
+function getUrlCache(url) {
+  const entry = _urlCache.get(url)
+  if (!entry) return null
+  if (entry.expires < Date.now()) { _urlCache.delete(url); return null }
+  return entry.ok
+}
+
+async function probeUrl(url) {
+  const cached = getUrlCache(url)
+  if (cached !== null) return cached
+  if (_urlPending.has(url)) return _urlPending.get(url)
+
+  const p = (async () => {
+    try {
+      const ctrl = new AbortController()
+      const t = setTimeout(() => ctrl.abort(), PROBE_TIMEOUT)
+      await fetch(url, { mode: 'no-cors', signal: ctrl.signal, referrerPolicy: 'no-referrer' })
+      clearTimeout(t)
+      _urlCache.set(url, { ok: true, expires: Date.now() + TTL })
+      return true
+    } catch {
+      _urlCache.set(url, { ok: false, expires: Date.now() + TTL })
+      return false
+    }
+  })()
+
+  _urlPending.set(url, p)
+  try { return await p } finally { _urlPending.delete(url) }
+}
+
+watch([() => inView.value, () => faviconUrl.value], async ([v, url]) => {
+  if (!v || !url) { actualSrc.value = ''; imgOk.value = false; return }
+  const ok = await probeUrl(url)
+  if (ok) actualSrc.value = url
+  else { actualSrc.value = ''; imgOk.value = false }
+}, { immediate: true })
+
 function onImgOk() { imgOk.value = true }
 function onImgErr() { imgOk.value = false }
 </script>
 
 <template>
   <span ref="rootEl" class="pkg-logo" :style="style" :title="name">
-    <!-- 进入视口后才挂载 img 发起 favicon 请求；加载成功后显示，失败回退字母徽标 -->
-    <img v-if="faviconUrl && inView" class="fav" :class="{ on: imgOk }" :src="faviconUrl" alt="" @load="onImgOk" @error="onImgErr" />
+    <!-- fetch 预检通过后才挂载 img；加载成功后显示，失败回退字母徽标 -->
+    <img v-if="actualSrc" class="fav" :class="{ on: imgOk }" :src="actualSrc" alt="" referrerpolicy="no-referrer" @load="onImgOk" @error="onImgErr" />
     <span v-show="!imgOk" class="lt">{{ letter }}</span>
   </span>
 </template>