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CVE-2026-17459— perwendel spark SparkJava ExternalResourceHandler.jav staticFiles.externalLocation symlink

Quick assessment

Affected
perwendel spark
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.

perwendel Spark是perwendel个人开发者开源的一个用于 Java 8 的轻量级 Web 框架。 perwendel Spark 2.9.4及之前版本存在后置链接漏洞，该漏洞源于对文件src/main/java/spark/resource/ExternalResourceHandler.jav中staticFiles.externalLocation参数的操纵，可能导致符号链接跟随。

CVSS 4.3 · Medium EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 5

VendorProduct Version RangeStatus
perwendel spark 2.9.0 affected
2.9.1 affected
2.9.2 affected
2.9.3 affected
2.9.4 affected
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I. Basic Information for CVE-2026-17459

Vulnerability Information
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Vulnerability Title
perwendel spark SparkJava ExternalResourceHandler.jav staticFiles.externalLocation symlink
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in perwendel spark up to 2.9.4. This vulnerability affects the function staticFiles.externalLocation of the file src/main/java/spark/resource/ExternalResourceHandler.jav of the component SparkJava. Executing a manipulation can lead to symlink following. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
perwendel Spark 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
perwendel Spark是perwendel个人开发者开源的一个用于 Java 8 的轻量级 Web 框架。 perwendel Spark 2.9.4及之前版本存在后置链接漏洞，该漏洞源于对文件src/main/java/spark/resource/ExternalResourceHandler.jav中staticFiles.externalLocation参数的操纵，可能导致符号链接跟随。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
perwendel spark 2.9.0 cpe:2.3:a:perwendel:spark:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-17459

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III. Intelligence Information for CVE-2026-17459

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Exploits & Public PoCs for CVE-2026-17459 (1)

IV. Related Vulnerabilities

Same weakness: CWE-61

V. Comments for CVE-2026-17459

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