{"id":"GHSA-r3jf-hm7q-qfw5","aliases":["CVE-2025-46556"],"title":"MantisBT Vulnerable to Denial-of-Service (DoS) via Excessive Note Length","description":"A lack of server-side validation for note length in MantisBT allows attackers to permanently corrupt issue activity logs by submitting extremely long notes (tested with 4,788,761 characters). Once such a note is added:\n\n### Impact\n- The entire activity stream becomes unviewable (UI fails to render).\n- New notes cannot be displayed, effectively breaking all future collaboration on the issue.\n\n### Patches\nFixed in 2.27.2.\n\n### Workarounds\nNone\n\n### Credits\nThanks to Mazen Mahmoud (@TheAmazeng) for reporting the vulnerability.","severity":"medium","score":6.5,"published":"2025-11-03T17:07:39.000Z","modified":"2025-11-04T17:17:47.060Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","ranges":[{"events":[{"introduced":"0"},{"fixed":"2.27.2"}],"type":"ECOSYSTEM"}],"versions":["2.10.0","2.10.1","2.11.0","2.11.1","2.12.0","2.12.1","2.12.2","2.13.0","2.13.1","2.13.2","2.14.0","2.15.0","2.15.1","2.16.0","2.16.1","2.17.0","2.17.1","2.17.2","2.18.0","2.18.1","2.19.0","2.19.1","2.20.0","2.20.1","2.21.0","2.21.1","2.21.2","2.21.3","2.22.0","2.22.1","2.22.2","2.23.0","2.23.1","2.24.0","2.24.1","2.24.2","2.24.3","2.24.4","2.24.5","2.25.0","2.25.1","2.25.2","2.25.3","2.25.4","2.25.5","2.25.6","2.25.7","2.25.8","2.26.0","2.26.1","2.26.2","2.26.3","2.26.4","2.27.0","2.27.1","2.3.0","2.3.1","2.3.2","2.3.3","2.4.0","2.4.1","2.4.2","2.5.0","2.5.1","2.5.2","2.6.0","2.7.0","2.7.1","2.8.0","2.8.1","2.9.0","2.9.1"],"fixed":["2.27.2"]}],"references":["https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5","https://nvd.nist.gov/vuln/detail/CVE-2025-46556","https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234","https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238","https://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361","https://github.com/mantisbt/mantisbt"],"sources":[{"name":"OSV","id":"GHSA-r3jf-hm7q-qfw5","modified":"2025-11-04T17:17:47.060930Z","url":"https://osv.dev/vulnerability/GHSA-r3jf-hm7q-qfw5"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5}]}