{"id":"UBUNTU-CVE-2026-45793","details":"Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\\IO\\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs_\u003cid\u003e_\u003cbase64url-JWT\u003e format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.","modified":"2026-07-22T11:42:43.070058046Z","published":"2026-07-15T17:16:00Z","upstream":["CVE-2026-45793"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45793"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-45793"},{"type":"REPORT","url":"https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2"}],"affected":[{"package":{"name":"composer","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/composer?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0~alpha10+20150602-1","1.0.0~alpha10+20150602-2","1.0.0~alpha11-1","1.0.0~alpha11-1ubuntu1","1.0.0~alpha11-2","1.0.0~alpha11-3","1.0.0~beta1-1ubuntu1","1.0.0~beta2-1","1.0.0~beta2-1ubuntu0.1~esm1","1.0.0~beta2-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.0~beta2-1ubuntu0.1~esm2","binary_name":"composer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45793.json"}},{"package":{"name":"composer","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/composer?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.1-1","1.5.2-1","1.6.2-1","1.6.3-1","1.6.3-1ubuntu0.1~esm1","1.6.3-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.6.3-1ubuntu0.1~esm2","binary_name":"composer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45793.json"}},{"package":{"name":"composer","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/composer?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.0-2","1.9.1-1","1.9.2-1","1.9.3-1","1.10.0-1","1.10.1-1","1.10.1-1ubuntu0.1~esm1","1.10.1-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.1-1ubuntu0.1~esm2","binary_name":"composer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45793.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}