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EUVD-2026-260256

fkie_cve-2025-46556

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.

GHSA-r3jf-hm7q-qfw5 — MantisBT Vulnerable to Denial-of-Service (DoS) via Excessive Note Length

Affected: Packagist: mantisbt/mantisbt

A lack of server-side validation for note length in MantisBT allows attackers to permanently corrupt issue activity logs by submitting extremely long notes (tested with 4,788,761 characters). Once such a note is added:

### Impact - The entire activity stream becomes unviewable (UI fails to render). - New notes cannot be displayed, effectively breaking all future collaboration on the issue.

### Patches Fixed in 2.27.2.

### Workarounds None

### Credits Thanks to Mazen Mahmoud (@TheAmazeng) for reporting the vulnerability.