composer: Composer is a dependency Manager for the PHP language
CVE-2026-45793 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-45793, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.
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_<id>_<base64url-JWT> 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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| composer · Debian 12.15 (bookworm) | 2.5.5-1+deb12u5 | DEBIAN-CVE-2026-45793 | May 15, 2026 |
| composer · Debian 13.5 (trixie) | 2.8.8-1+deb13u3 | DEBIAN-CVE-2026-45793 | May 15, 2026 |
| composer · Debian 14 | 2.10.0-1 | DEBIAN-CVE-2026-45793 | May 15, 2026 |
| composer · amzn 2023 | 2.9.8-1.amzn2023.0.1 | ALAS2023-2026-1800 | Jun 8, 2026 |
| php-composer2 · opensuse-leap 16.0 | 2.8.9-160000.6.1 | OPENSUSE-SU-2026:21970-1 | Sep 29, 2026 |
| php-composer2 · sles 15.6 | 2.6.4-150600.3.12.1 | SUSE-SU-2026:3105-1 | Jul 17, 2026 |
| php-composer2 · sles 15.7 | 2.6.4-150600.3.23.1 | SUSE-SU-2026:4288-1 | Sep 22, 2026 |
| php-composer2 · sles 15.7 | 2.6.4-150600.3.12.1 | SUSE-SU-2026:3105-1 | Jul 17, 2026 |
| php-composer2 · sles 16.0 | 2.8.9-160000.6.1 | SUSE-SU-2026:23943-1 | Sep 29, 2026 |
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