---
id: CVE-2026-54133
title: >-
  jmespath.php: jmespath.php has CompilerRuntime code injection via unescaped
  function names (CVE-2026-54133)
summary: >-
  A flaw was found in jmespath.php, a library for processing JSON documents in
  PHP applications. This vulnerability allows a remote attacker to execute
  arbitrary code by crafting a malicious JMESPath expression. The
  `JmesPath\CompilerRuntime…
severity: critical
cvss: 9.8
cvssSource: ghsa
cwe:
  - CWE-20
  - CWE-94
  - CWE-116
vendor: Red Hat
product: mtdowling/jmespath.php
affected:
  - mtdowling/jmespath.php < 2.9.1
patched:
  - mtdowling/jmespath.php 2.9.1
published: '2026-06-12'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:20:12+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54133.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54133.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-54133'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-54133'
  - url: >-
      https://github.com/jmespath/jmespath.php/security/advisories/GHSA-pcw8-m77r-2528
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54133'
  - url: >-
      https://github.com/FriendsOfPHP/security-advisories/blob/master/mtdowling/jmespath.php/CVE-2026-54133.yaml
  - url: 'https://github.com/advisories/GHSA-pcw8-m77r-2528'
tags:
  - csaf
  - vex
  - red-hat
  - ghsa
  - composer
epss: 0.00564
epssPercentile: 0.4447
aliases:
  - GHSA-pcw8-m77r-2528
ecosystem: composer
ingestedAt: '2026-08-18T20:22:15.558Z'
---

## Overview

A flaw was found in jmespath.php, a library for processing JSON documents in PHP applications. This vulnerability allows a remote attacker to execute arbitrary code by crafting a malicious JMESPath expression. The `JmesPath\CompilerRuntime` component fails to properly escape function names, leading to the generation and execution of attacker-controlled PHP code within the application's cache file. This could result in a complete compromise of the affected system.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54133.json)

**jmespath.php: jmespath.php has CompilerRuntime code injection via unescaped function names**. Released 2026-06-12, updated 2026-09-23.

Not affected:

- All currently supported Red Hat products

## Remediation

Refer to the advisory for fix availability.

## Package advisory (CVE-2026-54133)

Affected packages:

- `mtdowling/jmespath.php < 2.9.1`

Patched in:

- `mtdowling/jmespath.php 2.9.1`

Source: https://github.com/advisories/GHSA-pcw8-m77r-2528