---
title: "CVE-2026-38999: Monkey - Denial of Service"
description: "Monkey contains a null pointer dereference caused by improper handling in mk_sched_event_close function, letting attackers cause denial of service via crafted HTTP requests, exploit requires sending crafted requests."
url: https://panop.io/threat-heartbeat/CVE-2026-38999/
---

# CVE-2026-38999 Monkey - Denial of Service

Monkey contains a null pointer dereference caused by improper handling in mk\_sched\_event\_close function, letting attackers cause denial of service via crafted HTTP requests, exploit requires sending crafted requests.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

1.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-38999)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-476](https://cwe.mitre.org/data/definitions/476.html)

## Vendor fix

Update to the latest version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-38999](https://nvd.nist.gov/vuln/detail/CVE-2026-38999)
- [https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2026.md](https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2026.md)
- [https://github.com/monkey/monkey/issues/427](https://github.com/monkey/monkey/issues/427)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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