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CVE-2026-59946— Composer: Path traversal in package bin field lets dependencies chmod arbitrary host files

Quick assessment

Affected
composer composer
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.

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 2.2.29之前版本和2.10.2之前版本存在安全漏洞，该漏洞源于包含“..”路径段的包二进制条目解析到安装目录之外，导致在composer install、update或require过程中将现有主机文件修改为全局可读和可执行模式。

CVSS 6.1 · Medium EPSS 0.17% · P6

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-2026-59946

Vulnerability Information
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Vulnerability Title
Composer: Path traversal in package bin field lets dependencies chmod arbitrary host files
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 Composer package bin entry containing .. path segments can resolve outside the package install directory and cause Composer's binary installation flow to chmod an existing host file to a world-readable and world-executable mode during composer install, update, or require. 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:L/PR:N/UI:R/S:U/C:H/I:L/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
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 2.2.29之前版本和2.10.2之前版本存在安全漏洞，该漏洞源于包含“..”路径段的包二进制条目解析到安装目录之外，导致在composer install、update或require过程中将现有主机文件修改为全局可读和可执行模式。
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-2026-59946

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III. Intelligence Information for CVE-2026-59946

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Patches & Fixes for CVE-2026-59946 (3)

Vendor Advisories for CVE-2026-59946 (1)

Vendor Pages for CVE-2026-59946 (1)

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

CVE-2026-59948 7.0 HIGH Composer: Arbitrary file write outside vendor via malicious transitive package name
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-2026-59946

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