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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-46556
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-11-04 01:15:33 UTC
Updated2026-10-19 13:10:00 UTC
DescriptionMantis 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mantisbt Mantisbt All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mantisbt Mantisbt affected < 2.27.2 Not specified

References

ReferenceSourceLinkTags
github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead986... [email protected] github.com Patch
github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa... [email protected] github.com Patch
github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f715... [email protected] github.com Patch
github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5 [email protected] github.com Vendor Advisory
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