CVE-2025-46556 json
MantisBT is Vulnerable to Denial-of-Service (DoS) attack via Excessive Note Length
published 2025-11-03 12 mo ago modified 2026-10-19 21 d ago also EUVD-2025-37509 , GHSA-r3jf-hm7q-qfw5
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist mantisbt/mantisbt 2.27.2
- mantisbt mantisbt 2.27.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 12 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | mantisbt/mantisbt | <2.27.2 |
2.27.2 |
Affected products
- mantisbt mantisbt
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234
web, patch
-
github.com
/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238
web, patch
-
github.com
/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361
web, patch
-
github.com
/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-46556
advisory
-
github.com
/mantisbt/mantisbt
package
Sources
- CVE List CVE-2025-46556
- GitHub Advisory GHSA-r3jf-hm7q-qfw5
- NVD CVE-2025-46556
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.