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.

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.

EPSS: 0.004 (30.2th percentile) — read the EPSS interpretation.

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.

Affected products

Mantisbt — versions < 2.27.2

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Patch, x_refsource_MISC)

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.