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    CVE-2023-43655

    Composer is a dependency manager for PHP. Users publishing a composer.phar to a public web-accessible server where the composer.phar can be executed as a php file may be subject to a remote code execution vulnerability if PHP also has `register_argc_argv` enabled in php.ini. Versions 2.6.4, 2.2.22 and 1.10.27 patch this vulnerability. Users are advised to upgrade. Users unable to upgrade should make sure `register_argc_argv` is disabled in php.ini, and avoid publishing composer.phar to the web as this is not best practice.

    Published:Sep 29, 2023
    Last Modified:Jun 18, 2025
    EPS:Sep 29, 2023
    EPSS Score:0.02259
    CVSS Score:6.4

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Docker
    Product
    Composer
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Getcomposer
    Product
    Composer

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-105 HTTP Request Splitting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-273 HTTP Response Smuggling
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-34 HTTP Response Splitting
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-51 Poison Web Service Registry
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-6 Argument Injection
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-76 Manipulating Web Input to File System Calls
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-83 XPath Injection
    CAPEC-84 XQuery Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

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    References

    https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120d
    https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968c
    https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9c
    https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hf
    https://lists.debian.org/debian-lts-announce/2024/03/msg00030.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/66H2WKFUO255T3BZTL72TNYJYH2XM5FG/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/7AWYAUZNH565NWPIKGEIYBWHYNM5JGAE/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/KFOPGPW2KS37O3KJWBRGTUWHTXCQXBS2/
    https://github.com/composer/composer/commit/4fce14795aba98e40b6c4f5047305aba17a6120d
    https://github.com/composer/composer/commit/955a48e6319c8962e5cd421b07c00ab3c728968c
    https://github.com/composer/composer/commit/95e091c921037b7b6564942845e7b738f6b95c9c
    https://github.com/composer/composer/security/advisories/GHSA-jm6m-4632-36hf
    https://lists.debian.org/debian-lts-announce/2024/03/msg00030.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/66H2WKFUO255T3BZTL72TNYJYH2XM5FG/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/7AWYAUZNH565NWPIKGEIYBWHYNM5JGAE/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/KFOPGPW2KS37O3KJWBRGTUWHTXCQXBS2/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High