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CVE-2026-59948— Composer: Arbitrary file write outside vendor via malicious transitive package name

Quick assessment

Affected
composer composer
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.

Composer是Composer组织开源的一个应用软件。提供一个声明,管理和安装PHP项目的依赖项。 Composer 1.0版本至2.2.29之前版本和2.3.0版本至2.10.2之前版本存在安全漏洞，该漏洞源于依赖解析结果写入或安装前未正确验证包名，可能导致来自不受信任仓库的恶意构造包在安装或更新时将文件写入vendor目录和项目目录之外。

CVSS 7.0 · High EPSS 0.16% · P5

Affected Version Matrix 2

VendorProduct Version RangeStatus
composer composer >= 1.0, < 2.2.29 affected
>= 2.3.0, < 2.10.2 affected
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I. Basic Information for CVE-2026-59948

Vulnerability Information
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Vulnerability Title
Composer: Arbitrary file write outside vendor via malicious transitive package name
Source: CVE Program / CVE List V5
Vulnerability Description
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, a maliciously crafted package from an untrusted repository other than Packagist.org or Private Packagist can cause Composer to write attacker-controlled files outside the vendor directory and outside the project during install or update by using an invalid package name that is not correctly validated before dependency-resolution results are written or installed. This issue is fixed in versions 2.2.29 and 2.10.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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
Composer 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Composer是Composer组织开源的一个应用软件。提供一个声明,管理和安装PHP项目的依赖项。 Composer 1.0版本至2.2.29之前版本和2.3.0版本至2.10.2之前版本存在安全漏洞，该漏洞源于依赖解析结果写入或安装前未正确验证包名，可能导致来自不受信任仓库的恶意构造包在安装或更新时将文件写入vendor目录和项目目录之外。
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
composer composer >= 1.0, < 2.2.29 -

II. Public POCs for CVE-2026-59948

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8339 chars
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POC zip download
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III. Intelligence Information for CVE-2026-59948

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Patches & Fixes for CVE-2026-59948 (3)

Vendor Advisories for CVE-2026-59948 (1)

Vendor Pages for CVE-2026-59948 (1)

Same Patch Batch · composer · 2026-07-08 · 3 CVEs total

CVE-2026-59946 6.1 MEDIUM Composer: Path traversal in package bin field lets dependencies chmod arbitrary host files
CVE-2026-59947 4.7 MEDIUM Composer: URL-embedded HTTP-Basic username leaks to verbose logs (GitHub PAT exposure)

IV. Related Vulnerabilities

Same product: composer
Same vendor: composer
Same weakness: CWE-22

V. Comments for CVE-2026-59948

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