CVE-2025-46556 MEDIUM

CVE-2025-46556: MantisBT is Vulnerable to Denial-of-Service (DoS) attack via Excessive Note Length

Vendor Mantisbt
Product mantisbt
Weakness CWE-770 · Uncontrolled resource consumption
Published November 4, 2025
Last update November 6, 2025
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.27.1 and below allow attackers to permanently corrupt issue activity logs by submitting extremely long notes (tested with 4,788,761 characters) due to a lack of server-side validation of note length. Once such a note is added, the activity stream UI fails to render; therefore, new notes cannot be displayed, effectively breaking all future collaboration on the issue. This issue is fixed in version 2.27.2.

Key dates

02Disclosure timeline

November 4, 2025 CVE published
November 6, 2025 Record updated