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CVE-2026-44594— esm.sh: Path Traversal via package.json browser field allows reading arbitrary server files

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 137及之前版本存在安全漏洞，该漏洞源于esbuild插件处理package.json中browser字段时存在本地文件包含漏洞，允许攻击者发布npm包导致服务器在构建过程中读取并返回主机文件系统中的任意文件。

CVSS 7.5 · High EPSS 0.48% · P40

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
esm-dev esm.sh <= 137 affected
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I. Basic Information for CVE-2026-44594

Vulnerability Information
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Vulnerability Title
esm.sh: Path Traversal via package.json browser field allows reading arbitrary server files
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, a Local File Inclusion (LFI) vulnerability exists in the esbuild plugin's handling of the browser field in package.json. An attacker can publish an npm package that causes the server to read and return arbitrary files from the host filesystem during the build process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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 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 137及之前版本存在安全漏洞，该漏洞源于esbuild插件处理package.json中browser字段时存在本地文件包含漏洞，允许攻击者发布npm包导致服务器在构建过程中读取并返回主机文件系统中的任意文件。
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 <= 137 -

II. Public POCs for CVE-2026-44594

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6688 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-44594

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Vendor Advisories for CVE-2026-44594 (1)

IV. Related Vulnerabilities

Same product: esm.sh
Same vendor: esm-dev
Same weakness: CWE-22

V. Comments for CVE-2026-44594

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