---
id: CVE-2026-38999
title: >-
  A Null Pointer Dereference in the mk_sched_event_close function
  (mk_server/mk_scheduler.c) of Monkey through commit 4fb0c16 allows attackers
  to cause a Denial of Service (DoS) via sending a crafted HTTP request to the
  server.
summary: >-
  A Null Pointer Dereference in the mk_sched_event_close function
  (mk_server/mk_scheduler.c) of Monkey through commit 4fb0c16 allows attackers
  to cause a Denial of Service (DoS) via sending a crafted HTTP request to the
  server.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
published: '2026-09-16'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:00:03.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-38999'
references:
  - url: >-
      https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2026.md
    label: cve@mitre.org
  - url: 'https://github.com/monkey/monkey/issues/427'
    label: cve@mitre.org
  - url: 'https://github.com/monkey/monkey/issues/427'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.014
epssPercentile: 0.71354
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-22T16:05:04.983997Z'
ingestedAt: '2026-09-16T19:02:30.737Z'
---

## Overview

A Null Pointer Dereference in the mk_sched_event_close function (mk_server/mk_scheduler.c) of Monkey through commit 4fb0c16 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

## Remediation

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