Resource exhaustion in Mantisbt
CVE-2025-46556
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Mantisbt — versions < 2.27.2
Weakness classification (CWE)
References
- github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5 (Vendor Advisory)
- github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234 (Patch)
- github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238 (Patch)
- github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361 (Patch)
Frequently asked questions
- What is CVE-2025-46556?
- CVE-2025-46556 is a medium-severity vulnerability in Mantisbt, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2025-11-04.
- How severe is CVE-2025-46556?
- Medium severity. CVSS v3 base score is 6.5 out of 10.