🛡️ CVE-2025-46556 — mantisbt
Description
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.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
Weakness class
CVE-2025-46556 is classified as CWE-770: Allocation of Resources Without Limits. Resources are allocated on request with no cap, so a client can exhaust them.
Affected software
CVE-2025-46556 is recorded against 2 packages.
- mantisbt (fixed in 2.27.2)
- mantisbt/mantisbt (fixed in 2.27.2)
Timeline and source
Published on 4 November 2025 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.
References
Details
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| mantisbt | — | 2.27.2 |
| mantisbt/mantisbt | — | 2.27.2 |
References
Similar Threats
- Critical CVE-2026-30849
- High CVE-2026-33517
- High CVE-2026-33548
- Critical CVE-2025-47776
- Medium CVE-2025-55155
Vulnerability Monitoring
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