Medium 6.5Published Nov 3, 2025

CVE-2025-46556MantisBT is Vulnerable to Denial-of-Service (DoS) attack via Excessive Note Length

Updated under an hour ago (Oct 27, 2026, 2:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for mantisbt

Exploited in the last 30 days

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: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Nov 6, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mantisbt mantisbt mantisbt:mantisbt (from the name)	before 2.27.2	CNA record
mantisbt mantisbt mantisbt:mantisbt	before 2.27.2	NVD

References

References

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5	x-refsource-confirm, vendor-advisory
https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234	x-refsource-misc, patch
https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238	x-refsource-misc, patch
https://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.