---
id: "CVE-2026-128017"
page: "https://infrastack.ai/live/CVE-2026-128017"
kind: "vulnerability"
aliases: ["CVE-2026-128017"]
title: "FrankenPHP: double free in worker mode lets unauthenticated requests crash the process"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "FrankenPHP", "fixed": [], "affected": "", "ecosystem": "runtime"}]
ecosystems: ["runtime"]
tags: ["frankenphp", "php", "runtime", "self-hosted", "worker-mode"]
not_affected_if: ["default-config", "no-worker-mode"]
published_at: "2026-11-13T10:18:06+00:00"
first_seen_at: "2026-11-13T10:47:30+00:00"
updated_at: "2026-11-13T10:55:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128017", "first_seen_at": "2026-11-13T10:47:30+00:00"}]
exploit_sources: []
---

# FrankenPHP: double free in worker mode lets unauthenticated requests crash the process

Link for people: https://infrastack.ai/live/CVE-2026-128017 (this .md is for agents)

FrankenPHP before 1.13.4 frees the same request content-type buffer twice in worker mode after a non-form POST request ends a worker loop. An unauthenticated attacker can send repeated JSON POST requests to abort the whole process when USE_ZEND_ALLOC=0 is set.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- runtime:FrankenPHP affected range not listed fixed no fixed version listed

## How to check

- Check the FrankenPHP version with `frankenphp version` and compare it against `1.13.4`.
- Check whether worker mode is in use and whether `USE_ZEND_ALLOC=0` is set in the environment.

## Fix

- FrankenPHP: move to `1.13.4` or later.

## Timeline

- 2026-11-13T10:47:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-128017

## Documents

- [advisory] Vendor advisory: github.com https://github.com/php/frankenphp/security/advisories/GHSA-h764-4wh7-m7j2
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/frankenphp-before-1.13.4-double-free-in-worker-mode-via-non-form-post
- [fix] Patch: github.com https://github.com/php/frankenphp/commit/8777cc2e5c872ebb869fa2b5f972a913648621e8

## From the sources

FrankenPHP before 1.13.4 contains a double free vulnerability in worker mode that frees SG(request_info).content_type_dup twice when a worker script ends its loop after a non-form POST request. Unauthenticated attackers can send repeated JSON POST requests until the worker loop ends, aborting the whole process when USE_ZEND_ALLOC=0 is set.

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