MantisBT Vulnerable to Denial-of-Service (DoS) via Excessive Note Length
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-46556US | high7.5 | — | ||
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 not… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/mantisbt/mantisbtPACKAGE
- https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234WEB
- https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238WEB
- https://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361WEB
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5WEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-46556ADVISORY
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