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GHSA-r3jf-hm7q-qfw5

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

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-46556

Packages

EcosystemPackageAffectedFixed in
Packagist mantisbt/mantisbt < 2.27.2 2.27.2

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.