CVE-2026-44593— esm.sh: Legacy Route Path Traversal Can Lead to RCE
Quick assessment
Affected
esm-dev esm.sh
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.
esm.sh是esm.sh开源的一个内容分发网络。 esm.sh 137及之前版本存在路径遍历漏洞，该漏洞源于旧版路由器在拼接路径组件时未进行清理，导致攻击者可以构造请求将数据写入服务器上的任意位置。
Possible ATT&CK Techniques 1 AI
T1048 · Exfiltration Over Alternative Protocol
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I. Basic Information for CVE-2026-44593
Vulnerability Information
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Vulnerability Title
esm.sh: Legacy Route Path Traversal Can Lead to RCE
Source: CVE Program / CVE List V5
Vulnerability Description
esm.sh is a no-build content delivery network (CDN) for web development. In 137 and earlier, the legacy router first retrieves a response from legacyServer, parses the incoming request path, and ultimately writes the data to storage via buildStorage.Put. The router concatenates the path components without sanitizing them, producing a storage key. When this key is used, the underlying file system resolves the relative segments and writes the file to the specified path. Thus an attacker can craft a request that writes data to arbitrary locations on the server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
esm.sh 路径遍历漏洞
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 137及之前版本存在路径遍历漏洞，该漏洞源于旧版路由器在拼接路径组件时未进行清理，导致攻击者可以构造请求将数据写入服务器上的任意位置。
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
II. Public POCs for CVE-2026-44593
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2026-44593 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-44593
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