CVE-2025-67746: Composer/composer Composer Is Vulnerable To ANSI Vulnerability

LOW
Advisory Identifier: GHSA-59pp-r3rg-353g
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CWE-74
Published
Advisory Summary

CVE-2025-67746 is a LOW composer is vulnerable to ansi vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Composer/composer libraries in the Packagist ecosystem. The issue involves composer is vulnerable to ansi sequence injection. Remediation is available by upgrading affected packages to version 2.2.26, 2.9.3.

CVE-2025-67746 at a Glance

CVE Identifier CVE-2025-67746
GHSA Identifier GHSA-59pp-r3rg-353g
Severity LOW
CVSS v3.1 Base Score N/A
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Composer/composer
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2025-67746

To remediate this vulnerability, upgrade all affected Composer/composer dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

composer/composer fixed: 2.2.26 
Upgrade composer/composer to 2.2.26
composer/composer fixed: 2.9.3 
Upgrade composer/composer to 2.9.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for composer/composer

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-67746, inspect your project dependencies for Composer/composer:

inspect dependencies for composer/composer

Analyze the terminal output to locate any version of Composer/composer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.2.26), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), where the product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. In Composer/composer, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact Attackers controlling remote sources that Composer downloads from might in some way inject ANSI control characters in the terminal output of various Composer commands, causing mangled output and potentially leading to confusion or DoS of the terminal application. There is no proven exploit and this has thus a low severity but Composer still published a CVE as it has potential for abuse, and Composer wants to be on the safe side informing users that they should upgrade. ### Patches 2.2.26 for 2.2 LTS or 2.9.3 for mainline.

CVE-2025-67746 Affected Composer/composer Versions

2 component(s)
Fixed Versions:
2.2.262.9.3
Product / Package Ecosystem Affected Versions Fixed Version
composer/composer
 Packagist
≥ 2.0.0
< 2.2.26
2.2.26
composer/composer
 Packagist
≥ 2.3.0
< 2.9.3
2.9.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/composer/composer/security/advisories/GHSA-59pp-r3rg-353g
NVD — CVE-2025-67746 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-67746
Security Fix Commit FIX COMMIT
https://github.com/composer/composer/commit/1d40a95c9d39a6b7f80d404ab30336c586da9917
Security Fix Commit FIX COMMIT
https://github.com/composer/composer/commit/5db1876a76fdef76d3c4f8a27995c434c7a43e71
Composer/composer Source Repository REPOSITORY
https://github.com/composer/composer
Composer/composer Release RELEASE
https://github.com/composer/composer/releases/tag/2.2.26
Composer/composer Release RELEASE
https://github.com/composer/composer/releases/tag/2.9.3

Frequently Asked Questions

What is CVE-2025-67746?
CVE-2025-67746 is a security vulnerability in Composer/composer involving Composer is vulnerable to ANSI sequence injection under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Composer/composer versions are affected?
Affected versions include releases prior to 2.2.26, 2.9.3 across affected packages: composer/composer.
What version fixes CVE-2025-67746?
Upgrading to 2.2.26, 2.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is composer/composer affected?
Yes, composer/composer is affected in releases prior to 2.2.26, 2.9.3. Upgrade your dependency to 2.2.26, 2.9.3 or later.
What CWE is associated with CVE-2025-67746?
CVE-2025-67746 is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.).
How can I check Packagist dependencies for CVE-2025-67746?
Run the dependency tree command: 'inspect dependencies for composer/composer'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-59pp-r3rg-353g",
  "modified" : "2025-12-31T22:17:32Z",
  "published" : "2025-12-30T17:44:10Z",
  "aliases" : [ "CVE-2025-67746" ],
  "summary" : "Composer is vulnerable to ANSI sequence injection",
  "details" : "### Impact\nAttackers controlling remote sources that Composer downloads from might in some way inject ANSI control characters in the terminal output of various Composer commands, causing mangled output and potentially leading to confusion or DoS of the terminal application.\n\nThere is no proven exploit and this has thus a low severity but Composer still published a CVE as it has potential for abuse, and Composer wants to be on the safe side informing users that they should upgrade.\n\n### Patches\n2.2.26 for 2.2 LTS or 2.9.3 for mainline.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "composer/composer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.2.26"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "composer/composer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.3.0"
      }, {
        "fixed" : "2.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/composer/composer/security/advisories/GHSA-59pp-r3rg-353g"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-67746"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/composer/composer/commit/1d40a95c9d39a6b7f80d404ab30336c586da9917"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/composer/composer/commit/5db1876a76fdef76d3c4f8a27995c434c7a43e71"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/composer/composer"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/composer/composer/releases/tag/2.2.26"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/composer/composer/releases/tag/2.9.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-12-30T17:44:10Z",
    "nvd_published_at" : "2025-12-30T16:15:47Z"
  }
}