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Low, CVSS 2.3amended

Laravel: Task Output Injection - Concurrency Process

CVE-2026-128083GHSA-63hm-g96r-2m2q

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (laravel/framework 13.40.0, 12.71.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist laravel/framework

    Affected
    < 12.71.0>= 13.0.0, < 13.40.0
    Fixed in
    13.40.0, 12.71.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
2.3 · 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 · score source
EPSS
  • CVE-2026-128083: 0.70% estimated exploitation activity in the next 30 days; percentile 53.87 (FIRST EPSS, 2026-11-14). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary If a concurrency task prints user-controlled text, an attacker can forge the framework's internal result message and achieve remote code execution in certain conditions

Pre-reqs Insecure code and insecure handling of user provided input (devs trust user-provided input) : 1. App has a route that reaches Concurrency::run() (Not by default, it requires app code) 2. The task writes user-controlled data to stdout (echo/print/`dd` of input, hand-built JSON via string concat, passthrough of tool output), and the user-controlled bytes can be made to start the child's stdout and form a complete JSON document followed by \x1f\x8b (Not by default, requires the specific coding pattern in the app code)

Patches * 13.40.0 * 12.71.0

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-63hm-g96r-2m2q

  2. Revision 1 · created ·

    Published from ghsa record GHSA-63hm-g96r-2m2q

Agent brief

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# Patch Next advisory brief: CVE-2026-128083

Advisory: Laravel: Task Output Injection - Concurrency Process
IDs: CVE-2026-128083, GHSA-63hm-g96r-2m2q
Record: https://patchnext.com/advisories/cve-2026-128083 (revision 2, source checked 14 Nov 2026, 08:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: laravel/framework 13.40.0, 12.71.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist laravel/framework: affected < 12.71.0; >= 13.0.0, < 13.40.0; fixed in 13.40.0, 12.71.0

## Suggested inspection (read-only)
- Packagist laravel/framework: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on laravel/framework.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-63hm-g96r-2m2q (GitHub-reviewed advisory GHSA-63hm-g96r-2m2q lists affected ranges: Packagist laravel/framework >=0 =13.0.0 <13.40.0)
- Verified: https://osv.dev/vulnerability/GHSA-63hm-g96r-2m2q (OSV record GHSA-63hm-g96r-2m2q lists affected ranges: Packagist laravel/framework >=0 =13.0.0 <13.40.0 (fixed))

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