# CVE-2026-128083: Laravel: Task Output Injection - Concurrency Process

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- laravel / framework: >= 13.0.0, < 13.40.0 (affected); < 12.71.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 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; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-502

## 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-2m2q (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/laravel/framework/pull/62297 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/laravel/framework/commit/0f904940d176d51db1105cc925136f01bb69e92c (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/laravel/framework/commit/c37133b89b30a86eb404537151edd8944e938f0a (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/laravel/framework/releases/tag/v12.71.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/laravel/framework/releases/tag/v13.40.0 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-128083; retrieved 2026-11-13; source updated 2026-11-13

Revision: 844351f8b53c2388ff604e0e6f98bee72881c918c9030a72ff4f16c4e5c5c249

Canonical: https://y2.dev/cve/CVE-2026-128083

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