CVE-2025-67746: Composer is a dependency manager for PHP

Routine

MEDIUM 4.3UPGRADE

CVE-2025-67746 is a medium-severity flaw (CVSS 4.3) affecting composer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Composer is a dependency manager for PHP. In versions on the 2.x branch prior to 2.2.26 and 2.9.3, 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 we still publish a CVE

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-74
Published	2025-12-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: getcomposer

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-30 16:15 UTCPublished CVE record published
2026-06-17 09:58 UTCUpdated Record last modified

getcomposer composer UPGRADE

Affected: >= 2.0.0 and < 2.2.26 · >= 2.3.0 and < 2.9.3

Fixed in: 2.2.26, 2.9.3

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy composer || rpm -q composer || composer --version

2. UPGRADE to 2.2.26 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade composer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade composer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison composer sudo apt install composer=<VERSION_BEFORE_2.0.0> sudo apt-mark hold composer

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list composer sudo dnf downgrade composer-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add composer

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-67746?

composer: upgrade to 2.2.26, 2.9.3. Exact commands for each OS are on this page.

Is CVE-2025-67746 being exploited?

CVE-2025-67746 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-67746 affect?

CVE-2025-67746 affects composer. Severity is medium (CVSS 4.3). Composer is a dependency manager for PHP. In versions on the 2.x branch prior to 2.2.26 and 2.9.3, attackers controlling remote sources that Composer downloads from might in some way inject ANSI control characters in the terminal output of

How urgent is CVE-2025-67746?

Priority 25/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-40261 HIGH 8.8 UPGRADE Composer is a dependency manager for PHP
CVE-2026-40176 HIGH 7.8 UPGRADE Composer is a dependency manager for PHP
CVE-2025-3510 MEDIUM 6.4 UPGRADE The tagDiv Composer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple shortcodes
CVE-2024-24821 HIGH 8.8 UPGRADE Composer is a dependency Manager for the PHP language
CVE-2023-43655 MEDIUM 6.4 UPGRADE MITIGATE Composer is a dependency manager for PHP

References

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