---
id: "CVE-2026-128014"
page: "https://infrastack.ai/live/CVE-2026-128014"
kind: "vulnerability"
aliases: ["CVE-2026-128014"]
title: "FrankenPHP: bundled Brotli decoder flaw lets crafted data crash or run code"
severity: "critical"
cvss: 9.2
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["frankenphp", "php", "runtime", "self-hosted"]
not_affected_if: ["no-brotli-decompression", "non-static-build", "other-packaging"]
published_at: "2026-11-13T10:18:06+00:00"
first_seen_at: "2026-11-13T10:47:30+00:00"
updated_at: "2026-11-13T10:48:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128014", "first_seen_at": "2026-11-13T10:47:30+00:00"}]
exploit_sources: []
---

# FrankenPHP: bundled Brotli decoder flaw lets crafted data crash or run code

Link for people: https://infrastack.ai/live/CVE-2026-128014 (this .md is for agents)

FrankenPHP standalone static binaries from 1.8.0 before 1.13.2 include a PHP brotli extension linked to Brotli 1.2.0, which has an out-of-bounds write in its decoder. An unauthenticated remote attacker can send crafted data to applications that pass it to brotli_uncompress_add(), crashing the FrankenPHP process and possibly leaking memory or running code.

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

## How to check

- Run `frankenphp version` on each host and check whether it reports a version from `1.8.0` up to, but not including, `1.13.2`.
- Check whether the application calls `brotli_uncompress_add()` on data it receives from outside.

## Fix

- FrankenPHP standalone static binaries: `1.13.2`

## Timeline

- 2026-11-13T10:47:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-128014

## Documents

- [advisory] Vendor advisory: github.com https://github.com/php/frankenphp/security/advisories/GHSA-p746-jj3f-94p8
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/frankenphp-1.8.0-before-1.13.2-out-of-bounds-write-via-bundled-brotli-decoder

## From the sources

FrankenPHP standalone static binaries 1.8.0 before 1.13.2 bundle the PHP brotli extension statically linked with Brotli 1.2.0, whose decoder contains an out-of-bounds write (CVE-2026-111497). Unauthenticated remote attackers can send crafted data to applications that pass it to brotli_uncompress_add() to crash the entire FrankenPHP process, and possibly cause memory disclosure or code execution.

---

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