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OpenAdvisories
Medium · 6.5 CVE-2025-46556 EUVD-2025-37509GHSA-r3jf-hm7q-qfw5

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

Published Nov 4, 2025 · Updated Nov 6, 2025 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
mantisbt mantisbt < 2.27.2 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist mantisbt/mantisbt < 2.27.2 2.27.2 GHSA-r3jf-hm7q-qfw5

References