CVE-2025-63651

HIGH

monkey < 1.8.5 - Denial of Service via mk_string_char_search Use-After-Free

Title source: llm

Description

A use-after-free in the mk_string_char_search function (mk_core/mk_string.c) of monkey commit f37e984 allows attackers to cause a Denial of Service (DoS) via sending a crafted HTTP request to the server.

References (2)

Core 2

Core References

Various Sources

https://github.com/archersec/security-advisories/blob/master/monkey/monkey-advisory-2025.md

View Writeup ZIP pw:eip

Issue Tracking

https://github.com/monkey/monkey/issues/426

Scores

CVSS v3 7.5

EPSS 0.0090

EPSS Percentile 55.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-416

Status published

Products (1)

monkey-project/monkey < 1.8.5

Published Jan 29, 2026

Tracked Since Feb 18, 2026