diff --git a/parser/src/main/java/cn/qaiu/parser/PanBase.java b/parser/src/main/java/cn/qaiu/parser/PanBase.java
index 601534b..8bba7a0 100644
--- a/parser/src/main/java/cn/qaiu/parser/PanBase.java
+++ b/parser/src/main/java/cn/qaiu/parser/PanBase.java
@@ -20,6 +20,9 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.*;
+import java.net.InetAddress;
+import java.net.URL;
+import java.net.UnknownHostException;
 import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -201,6 +204,76 @@ public abstract class PanBase implements IPanTool, Closeable {
         }
     }
 
+    /**
+     * SSRF 防护: 校验通用自定义域名解析器 (CE/Ce4/Kd/Other 等) 即将请求的目标主机,
+     * 拒绝解析到回环/内网/链路本地/组播等非公网地址的域名, 阻止攻击者通过可控 DNS
+     * 记录 (或直接填写内网域名) 让服务端向内网/云元数据接口发起请求。
+     * <p>
+     * 必须在子类 parse() 中构造出 baseUrl/发起任何 clientSession 请求之前调用。
+     *
+     * @param url 从 shareLinkInfo.getShareUrl() 解析出的 URL
+     * @throws IOException 当主机无法解析或解析结果落入禁止的地址段时抛出
+     */
+    protected static void assertPublicHost(URL url) throws IOException {
+        String host = url.getHost();
+        InetAddress[] addresses;
+        try {
+            addresses = InetAddress.getAllByName(host);
+        } catch (UnknownHostException e) {
+            throw new IOException("无法解析目标主机: " + host, e);
+        }
+        if (addresses.length == 0) {
+            throw new IOException("无法解析目标主机: " + host);
+        }
+        for (InetAddress addr : addresses) {
+            if (isDisallowedAddress(addr)) {
+                throw new IOException("目标地址不允许访问(内网/回环/链路本地/组播): "
+                        + host + " -> " + addr.getHostAddress());
+            }
+        }
+    }
+
+    /**
+     * 判断地址是否落入禁止访问的范围: 0.0.0.0/8, 10/8, 127/8, 169.254/16(含云元数据
+     * 169.254.169.254), 172.16/12, 192.168/16, 100.64/10(CGNAT), 224/4~255/4(组播/保留),
+     * 以及对应的 IPv6 回环/链路本地/唯一本地地址(fc00::/7)/组播地址; IPv4-映射的 IPv6
+     * 地址(::ffff:a.b.c.d) 会先还原为 IPv4 再判断，避免绕过。
+     */
+    private static boolean isDisallowedAddress(InetAddress addr) {
+        byte[] bytes = addr.getAddress();
+        if (bytes.length == 16 && isIPv4Mapped(bytes)) {
+            byte[] v4 = new byte[4];
+            System.arraycopy(bytes, 12, v4, 0, 4);
+            bytes = v4;
+        }
+        if (bytes.length == 4) {
+            int b0 = bytes[0] & 0xFF;
+            int b1 = bytes[1] & 0xFF;
+            if (b0 == 0) return true;                          // 0.0.0.0/8
+            if (b0 == 10) return true;                         // 10.0.0.0/8
+            if (b0 == 127) return true;                        // 127.0.0.0/8 loopback
+            if (b0 == 169 && b1 == 254) return true;            // 169.254.0.0/16 (含云元数据 169.254.169.254)
+            if (b0 == 172 && b1 >= 16 && b1 <= 31) return true; // 172.16.0.0/12
+            if (b0 == 192 && b1 == 168) return true;            // 192.168.0.0/16
+            if (b0 == 100 && b1 >= 64 && b1 <= 127) return true;// 100.64.0.0/10 CGNAT
+            return b0 >= 224;                                   // 224.0.0.0/4 组播 + 240.0.0.0/4 保留
+        }
+        // IPv6
+        if (addr.isAnyLocalAddress() || addr.isLoopbackAddress()
+                || addr.isLinkLocalAddress() || addr.isSiteLocalAddress()
+                || addr.isMulticastAddress()) {
+            return true;
+        }
+        return bytes.length == 16 && (bytes[0] & 0xFE) == 0xFC; // fc00::/7 unique local
+    }
+
+    private static boolean isIPv4Mapped(byte[] b) {
+        for (int i = 0; i < 10; i++) {
+            if (b[i] != 0) return false;
+        }
+        return (b[10] & 0xFF) == 0xFF && (b[11] & 0xFF) == 0xFF;
+    }
+
     protected String baseMsg() {
         if (shareLinkInfo.getShareUrl() != null) {
             return shareLinkInfo.getPanName() + "-" + shareLinkInfo.getType() + ": url=" + shareLinkInfo.getShareUrl();
diff --git a/parser/src/main/java/cn/qaiu/parser/impl/Ce4Tool.java b/parser/src/main/java/cn/qaiu/parser/impl/Ce4Tool.java
index 6cdb1c4..a481700 100644
--- a/parser/src/main/java/cn/qaiu/parser/impl/Ce4Tool.java
+++ b/parser/src/main/java/cn/qaiu/parser/impl/Ce4Tool.java
@@ -37,6 +37,7 @@ public class Ce4Tool extends PanBase {
         
         try {
             URL url = new URL(shareLinkInfo.getShareUrl());
+            assertPublicHost(url);
             String baseUrl = url.getProtocol() + "://" + url.getHost();
             // 如果有端口，拼接上端口
             if (url.getPort() != -1) {
diff --git a/parser/src/main/java/cn/qaiu/parser/impl/CeTool.java b/parser/src/main/java/cn/qaiu/parser/impl/CeTool.java
index 7daac1f..204899e 100644
--- a/parser/src/main/java/cn/qaiu/parser/impl/CeTool.java
+++ b/parser/src/main/java/cn/qaiu/parser/impl/CeTool.java
@@ -43,6 +43,7 @@ public class CeTool extends PanBase {
         String pwd = shareLinkInfo.getSharePassword();
         try {
             URL url = new URL(shareLinkInfo.getShareUrl());
+            assertPublicHost(url);
             String baseUrl = url.getProtocol() + "://" + url.getHost();
             // 如果有端口，拼接上端口
             if (url.getPort() != -1) {