CVE-2025-63656: High severity Monkey Monkey HTTP Server vulnerability

Published Jan 29, 2026
·
Updated

An out-of-bounds read in the headercmp function (mkserver/mkhttpparser.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

Affected Software

2 affected components
Monkey Monkey HTTP Server
Monkey-project Monkey<=1.8.5

Event History

Jan 29, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Data Sourced
via NVD·08:16 PM
DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

1

What is the severity of CVE-2025-63656?

CVE-2025-63656 is classified as a high severity vulnerability due to its potential to enable Denial of Service (DoS) attacks.

2

How do I fix CVE-2025-63656?

To fix CVE-2025-63656, update the Monkey HTTP Server to version 1.8.6 or later where the vulnerability has been addressed.

3

What systems are affected by CVE-2025-63656?

CVE-2025-63656 affects versions of the Monkey HTTP Server up to and including 1.8.5.

4

What kind of attack is facilitated by CVE-2025-63656?

CVE-2025-63656 allows attackers to leverage an out-of-bounds read to perform Denial of Service (DoS) attacks on the server.

5

What does the header_cmp function do in relation to CVE-2025-63656?

In CVE-2025-63656, the header_cmp function is vulnerable due to an out-of-bounds read which can be exploited by sending crafted HTTP requests.

Contact

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