Vulnerability · Published Nov 4, 2025 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity resource allocation without limits in mantisbt from mantisbt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 64.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	mantisbt/mantisbt	2.27.2	GHSA-r3jf-hm7q-qfw5

Affected products (as reported)

Vendor	Product	Versions
mantisbt	mantisbt	< 2.27.2

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5 x_refsource_CONFIRM
https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234 x_refsource_MISC
https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238 x_refsource_MISC
https://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361 x_refsource_MISC