CVE-2025-46556
MEDIUM6.5EPSS 0.06%MantisBT Vulnerable to Denial-of-Service (DoS) via Excessive Note Length
Published: 11/3/2025Modified: 11/4/2025
Also known as:GHSA-r3jf-hm7q-qfw5
Description
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.
Affected packages (1)
- Packagist/mantisbt/mantisbtfrom 0, < 2.27.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-46556
- PATCHhttps://github.com/mantisbt/mantisbt
- WEBhttps://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234
- WEBhttps://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238
- WEBhttps://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361
- WEBhttps://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5