CVE-2026-128026
Deferred Deferred - Pending Action

FrankenPHP Environment Sandbox Bypass via putenv

Publication date: 2026-11-13

Last updated on: 2026-11-13

Assigner: VulnCheck

Description
FrankenPHP from 1.5.0 before 1.13.0 contains an incomplete environment sandbox vulnerability in which putenv writes to the process-wide OS environment via os.Setenv, leaking values across concurrent requests. Attackers reaching a request path that spawns child processes with the default environment through proc_open or exec can read secrets such as database passwords set by other requests.

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Meta Information

Published
2026-11-13
Last Modified
2026-11-13
Generated
2026-11-13
AI Q&A
2026-11-13
EPSS Evaluated
N/A
NVD
CVE-2026-128026
EUVD
EUVD-2026-125076

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
frankenphp frankenphp From 1.5.0 (inc) to 1.13.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-488 The product does not sufficiently enforce boundaries between the states of different sessions, causing data to be provided to, or used by, the wrong session.

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Executive Summary

FrankenPHP versions 1.5.0 to 1.12.0 have a flaw where the putenv function writes to the process-wide OS environment instead of isolating it per request. This causes secrets like database passwords set by one request to leak to other concurrent requests via child processes spawned by functions like proc_open or exec.

Detection Guidance

To detect this vulnerability, check if your FrankenPHP version is between 1.5.0 and 1.12.0. Run: frankenphp version. If vulnerable, inspect for unexpected environment variable leaks across requests, especially in multi-threaded deployments using putenv.

Impact Analysis

Attackers could exploit this to read sensitive data set by other users or requests, such as database credentials. This could lead to unauthorized access, data breaches, or further system compromise if the leaked secrets are used maliciously.

Compliance Impact

This vulnerability could lead to unauthorized exposure of personal or sensitive data, violating GDPR's data protection principles and HIPAA's requirements for safeguarding protected health information. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Upgrade FrankenPHP to version 1.13.0 or later. Avoid using putenv for sensitive data. If upgrading is not possible, restrict access to request paths that spawn child processes via proc_open or exec to reduce exposure.

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