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

What is CVE-2025-46556?

CVE-2025-46556 is a medium-severity denial of service vulnerability in Mantisbt Mantisbt, published on 4 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-770

Which versions are affected by CVE-2025-46556?

2 open source packages ship an affected version, including mantisbt/mantisbt. It affects 1 product.

Products include Mantisbt Mantisbt.

How do I fix CVE-2025-46556?

Upgrade mantisbt/mantisbt to 2.27.2 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-46556 being exploited?

There is no known exploitation of CVE-2025-46556 in the wild and no public exploit code.

Other vulnerabilities in Mantisbt Mantisbt

• CVE-2019-15074 MantisBT allows cross-site scripting (XSS) via crafted filename Critical 9.6
• CVE-2026-30849 MantisBT SOAP API has an authentication bypass vulnerability on MySQL Critical 9.3
• CVE-2025-47776 MantisBT: Authentication bypass for some passwords due to PHP type juggling High 8.8
• CVE-2017-7615 MantisBT allows arbitrary password reset High 8.8
• CVE-2026-33517 MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation High 8.6

All Mantisbt Mantisbt vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-r3jf-hm7q-qfw5.