# CVE-2026-45793: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-45793
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0102
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 8, 2026

## Description

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

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | composer Debian 12.15 (bookworm) | 2.5.5-1+deb12u5 | [DEBIAN-CVE-2026-45793](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45793.md) | May 15, 2026 |
| Linux | composer Debian 13.5 (trixie) | 2.8.8-1+deb13u3 | [DEBIAN-CVE-2026-45793](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45793.md) | May 15, 2026 |
| Linux | composer Debian 14 | 2.10.0-1 | [DEBIAN-CVE-2026-45793](https://patchblox.com/security/data/fix/linux/debian-cve-2026-45793.md) | May 15, 2026 |
| Linux | composer amzn 2023 | 2.9.8-1.amzn2023.0.1 | [ALAS2023-2026-1800](https://patchblox.com/security/data/fix/linux/alas2023-2026-1800.md) | Jun 8, 2026 |
| Linux | php-composer2 opensuse-leap 16.0 | 2.8.9-160000.6.1 | [OPENSUSE-SU-2026:21970-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21970-1.md) | Sep 29, 2026 |
| Linux | php-composer2 sles 15.6 | 2.6.4-150600.3.12.1 | [SUSE-SU-2026:3105-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3105-1.md) | Jul 17, 2026 |
| Linux | php-composer2 sles 15.7 | 2.6.4-150600.3.23.1 | [SUSE-SU-2026:4288-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4288-1.md) | Sep 22, 2026 |
| Linux | php-composer2 sles 15.7 | 2.6.4-150600.3.12.1 | [SUSE-SU-2026:3105-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3105-1.md) | Jul 17, 2026 |
| Linux | php-composer2 sles 16.0 | 2.8.9-160000.6.1 | [SUSE-SU-2026:23943-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23943-1.md) | Sep 29, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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