---
id: CVE-2026-122233
title: FrankenPHP before 1.13.4 Cross-Request Response Header Leak in Worker Mode
summary: >-
  FrankenPHP before 1.13.4 contains an information disclosure vulnerability in
  worker mode that fails to clear last HTTP stream response headers between
  requests, because the reset only happens in RSHUTDOWN, which worker requests
  skip. Lat…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-488
vendor: php
product: frankenphp
affected:
  - frankenphp < 1.13.4
published: '2026-11-04'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T21:06:41.065Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-122233'
references:
  - url: 'https://github.com/php/frankenphp/security/advisories/GHSA-pmvg-8483-mw84'
    label: GitHub Security Advisory (GHSA-pmvg-8483-mw84)
  - url: >-
      https://github.com/php/frankenphp/commit/3fade63bb1c1d246926ed8a00520015f94cdc819
  - url: 'https://github.com/php/frankenphp/releases/tag/v1.13.4'
    label: frankenphp v1.13.4 Release Notes
  - url: >-
      https://www.vulncheck.com/advisories/frankenphp-before-1.13.4-cross-request-response-header-leak-in-worker-mode
    label: >-
      VulnCheck Advisory: FrankenPHP before 1.13.4 Cross-Request Response Header
      Leak in Worker Mode
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.593Z'
epss: 0.00233
epssPercentile: 0.14247
---

## Overview

FrankenPHP before 1.13.4 contains an information disclosure vulnerability in worker mode that fails to clear last HTTP stream response headers between requests, because the reset only happens in RSHUTDOWN, which worker requests skip. Later requests calling http_get_last_response_headers() can read headers fetched by earlier requests on the same worker thread, exposing other users' Set-Cookie or token headers from backend APIs.

## Affected

- `frankenphp < 1.13.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.