# CVE-2026-128026: FrankenPHP 1.5.0 before 1.13.0 Cross-Request Environment Leakage via putenv

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

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- php / frankenphp (github.com/dunglas/frankenphp): ≥ 1.5.0; < 1.13.0 (affected, semver); 1.13.0 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N; source: CNA: VulnCheck

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 6.4 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-488

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/php/frankenphp/security/advisories/GHSA-996f-w38m-f574 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/frankenphp-1.5.0-before-1.13.0-cross-request-environment-leakage-via-putenv (CNA: VulnCheck; third-party-advisory)

- https://github.com/php/frankenphp/security/advisories/GHSA-996f-w38m-f574 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/frankenphp-1.5.0-before-1.13.0-cross-request-environment-leakage-via-putenv (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-128026; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-128026; retrieved 2026-11-13; source updated 2026-11-13

Revision: 98fe1c006937715bf53bd4afd33535cdb01904f6ebe6404dd7f1cb77d08a2007

Canonical: https://y2.dev/cve/CVE-2026-128026

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