# CVE-2026-128015: FrankenPHP before 1.13.4 Use-After-Free via putenv() During Request Shutdown

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

FrankenPHP before 1.13.4 contains a use-after-free vulnerability that leaves a dangling pointer to a freed environment table when putenv() is called during request shutdown. Attackers triggering putenv() in shutdown functions, destructors, or session handlers can crash the process on the next getenv() call or leak previous request environment values.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/php/frankenphp/commit/ab174aa6c27738b9ee56c97ac276d152bfb38f5e

## Affected products and versions

- php / frankenphp (github.com/dunglas/frankenphp): ≥ 0; < 1.13.4 (affected, semver); 1.13.4 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.3 (high); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H; source: CNA: VulnCheck

- CVSS 4.0: 8.3 (high); CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/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: 6.5 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-416

## Exploit evidence

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

## References

- https://github.com/php/frankenphp/security/advisories/GHSA-rgpj-f2qx-xwhf (CNA: VulnCheck; vendor-advisory)

- https://github.com/php/frankenphp/commit/ab174aa6c27738b9ee56c97ac276d152bfb38f5e (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/frankenphp-before-1.13.4-use-after-free-via-putenv-during-request-shutdown (CNA: VulnCheck; third-party-advisory)

- https://github.com/php/frankenphp/commit/ab174aa6c27738b9ee56c97ac276d152bfb38f5e (disclosure@vulncheck.com)

- https://github.com/php/frankenphp/security/advisories/GHSA-rgpj-f2qx-xwhf (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/frankenphp-before-1.13.4-use-after-free-via-putenv-during-request-shutdown (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-128015; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-128015; retrieved 2026-11-13; source updated 2026-11-13

Revision: 2c7e87017a9c4c557e9f16cc53653f0e3a3f5c5105b0801d58a07556090d1133

Canonical: https://y2.dev/cve/CVE-2026-128015

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