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CVE-2025-46556

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

Published: Nov 4, 2025Updated: Nov 7, 2025 Sources: CVE List NVD GHSACWE-770
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 74.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-770

Affected Products

mantisbtmantisbt
On-premWeb App
Enterprise Software / itsm-monitoring
mantisbt/mantisbtPackagistOSS Libraries
mantisbtoss-projectEnterprise Softwareaka mantis bt
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5
github.com
https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234
github.com
https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238
github.com
and 3 more references View all →

Timeline

Published
Nov 4, 2025
Last Updated
Nov 7, 2025

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