CVE-2026-128083
Laravel: Task Output Injection - Concurrency Process
Laravel is a web application framework. Prior to 12.71.0 and 13.40.0, Laravel's Concurrency::run process driver can treat a forged internal result message in child standard output as framework output. An application route must invoke Concurrency::run, and a task must write attacker-controlled bytes at the start of the child's standard output that form a complete JSON document followed by gzip magic bytes. Under those application-specific conditions, an attacker can forge the internal result message and achieve remote code execution. The affected behavior is not exposed by default and requires application code that routes untrusted input into task output. This issue is fixed in versions 12.71.0 and 13.40.0.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| framework laravel |
>= 13.0.0, < 13.40.0 (affected) < 12.71.0 (affected) |
CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 2.3 low |
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/laravel/framework/security/advisories/GHSA-63hm-g96r-2m2qCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/laravel/framework/pull/62297CNA: GitHub_M · x_refsource_MISC
- https://github.com/laravel/framework/commit/0f904940d176d51db1105cc925136f01bb69e92cCNA: GitHub_M · x_refsource_MISC
- https://github.com/laravel/framework/commit/c37133b89b30a86eb404537151edd8944e938f0aCNA: GitHub_M · x_refsource_MISC
- https://github.com/laravel/framework/releases/tag/v12.71.0CNA: GitHub_M · x_refsource_MISC
- https://github.com/laravel/framework/releases/tag/v13.40.0CNA: GitHub_M · x_refsource_MISC
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