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CVE-2026-102740— AsyncHttpClient: Resumable download index store is created world-readable and follows a planted symlink

Quick assessment

Affected
AsyncHttpClient async-http-client
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AsyncHttpClient 库允许 Java 应用程序执行 HTTP 请求并异步处理 HTTP 响应。在版本 2.0.0 至 2.16.1 以及 3.0.12 之前，PropertiesBasedResumableProcessor 使用可预测的共享路径 （默认权限）并通过跟随符号链接的文件操作来存储可恢复下载的状态。能够读取该共享存储的本地用户可以获取下载 URL，其中包括嵌入的用户信息或查询令牌。能够写入或预先创建受影响共享存储目录的本地用户可以植入一个符号链接，客户端在保存状态时会跟随该链接，从而截断并覆

CVSS 5.8 · Medium

Possible ATT&CK Techniques 1 AI

T1552.006 · Group Policy Preferences

Affected Version Matrix 2

VendorProduct Version RangeStatus
AsyncHttpClient async-http-client >= 2.0.0, < 2.16.1 affected
>= 3.0.0, < 3.0.12 affected
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I. Basic Information for CVE-2026-102740

Vulnerability Information
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Vulnerability Title
AsyncHttpClient: Resumable download index store is created world-readable and follows a planted symlink
Source: CVE Program / CVE List V5
Vulnerability Description
The AsyncHttpClient library allows Java applications to execute HTTP requests and asynchronously process HTTP responses. From 2.0.0 until 2.16.1 and 3.0.12, PropertiesBasedResumableProcessor stores resumable download state at the predictable shared path $java.io.tmpdir/ahc/ResumableAsyncHandler.properties with default permissions and link-following file operations. A local user who can read the shared store can see download URLs, including embedded user information or query tokens. A local user who can write within or pre-create the affected shared store directory can plant a symbolic link that the client follows when saving state, truncating and overwriting a target file writable by the client process. The filesystem path is used when ResumableAsyncHandler decorates another AsyncHandler, while the no-argument constructors use a no-op processor and are unaffected. This issue is fixed in versions 2.16.1 and 3.0.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
AsyncHttpClient async-http-client >= 2.0.0, < 2.16.1 -

II. Public POCs for CVE-2026-102740

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III. Intelligence Information for CVE-2026-102740

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Patches & Fixes for CVE-2026-102740 (4)

Vendor Advisories for CVE-2026-102740 (1)

Vendor Pages for CVE-2026-102740 (1)

IV. Related Vulnerabilities

Same product: async-http-client
Same vendor: AsyncHttpClient
Same weakness: CWE-61

V. Comments for CVE-2026-102740

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