EUVD-2026-42363Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Requires local access to debug output and non-default -vvv flag (AC:H, AV:L, PR:L); only credential confidentiality is impacted, no integrity or availability effect.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionCVE.org
Composer is a dependency Manager for the PHP language. Prior to 2.2.29 and 2.10.2, when Composer is run with -vvv debug verbosity, it could print a credential embedded in the username slot of a repository or package URL, such as a GitHub Personal Access Token in https://TOKEN@host/, to debug output because AuthHelper, Url::sanitize, and ProcessExecutor did not sanitize username-only URL credentials. This issue is fixed in versions 2.2.29 and 2.10.2.
AnalysisAI
Credential leakage in Composer PHP dependency manager exposes sensitive tokens - such as GitHub Personal Access Tokens embedded in repository URLs - to debug output when the tool is invoked with the -vvv verbosity flag. Affected versions prior to 2.2.29 (LTS branch) and 2.10.2 fail to sanitize username-slot URL credentials (e.g., https://TOKEN@host/) across three components: AuthHelper, Url::sanitize, and ProcessExecutor. …
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Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two concurrent conditions: Composer must be invoked with the -vvv (triple-verbose) debug flag, and at least one repository or package source must be configured with a credential embedded in the URL userinfo component (e.g., https://TOKEN@host/ format). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 4.7 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N) accurately reflects the constrained exploitation conditions: local access, high complexity due to the non-default -vvv flag requirement, and low-privilege execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A developer or CI/CD pipeline invokes Composer with -vvv to debug a package resolution failure against a private GitHub registry configured with a PAT in the URL (https://TOKEN@github.com/org/repo). Composer prints the unsanitized URL to stdout, which is captured in the CI/CD build log. … |
| Remediation | Upgrade Composer to version 2.2.29 (LTS branch) or 2.10.2 (stable branch), which apply credential sanitization in AuthHelper, Url::sanitize, and ProcessExecutor. … Detailed patch versions, workarounds, and compensating controls in full report. |
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