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CVE-2025-59342— esm.sh writes arbitrary files via path traversal in `X-Zone-Id` header

Quick assessment

Affected
esm-dev esm.sh
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

esm.sh是esm.sh开源的一个内容分发网络。 esm.sh 136及之前版本存在安全漏洞，该漏洞源于X-Zone-Id HTTP标头处理不当，可能导致路径遍历攻击。

AI Predicted 8.2 Difficulty: Easy EPSS 3.01% · P87

Public Exploits 2

ExploitDB · 1 EDB-52461 [webapps]
Nuclei · 1 CVE-2025-59342.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-59342

Vulnerability Information
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Vulnerability Title
esm.sh writes arbitrary files via path traversal in `X-Zone-Id` header
Source: CVE Program / CVE List V5
Vulnerability Description
esm.sh is a nobuild content delivery network(CDN) for modern web development. In 136 and earlier, a path-traversal flaw in the handling of the X-Zone-Id HTTP header allows an attacker to cause the application to write files outside the intended storage location. The header value is used to build a filesystem path but is not properly canonicalized or restricted to the application’s storage base directory. As a result, supplying ../ sequences in X-Zone-Id causes files to be written to arbitrary directories. Version 136.1 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’../filedir’
Source: CVE Program / CVE List V5
Vulnerability Title
esm.sh 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
esm.sh是esm.sh开源的一个内容分发网络。 esm.sh 136及之前版本存在安全漏洞，该漏洞源于X-Zone-Id HTTP标头处理不当，可能导致路径遍历攻击。
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
esm-dev esm.sh <= 136 -

II. Public POCs for CVE-2025-59342

# POC Description Source Link Shenlong Link
1 Exploit Path Traversal in esm-dev https://github.com/byteReaper77/CVE-2025-59342 POC Details
2 esm.sh <= 136 contains a path traversal caused by improper canonicalization of the X-Zone-Id HTTP header, letting attackers write files outside the intended storage directory, exploit requires crafted header input. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-59342.yaml POC Details
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III. Intelligence Information for CVE-2025-59342

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Vendor Advisories for CVE-2025-59342 (1)

IV. Related Vulnerabilities

Same product: esm.sh
Same vendor: esm-dev
Same weakness: CWE-24

V. Comments for CVE-2025-59342

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