CVE-2025-46556: Mantisbt/mantisbt Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-r3jf-hm7q-qfw5
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CVSS 6.5
CWE-770
Published
Advisory Summary

CVE-2025-46556 is a MODERATE (CVSS 6.5) denial of service vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Mantisbt/mantisbt libraries in the Packagist ecosystem. The issue involves mantisbt vulnerable to denial-of-service (dos) via excessive note length. Remediation is available by upgrading affected packages to version 2.27.2.

CVE-2025-46556 at a Glance

CVE Identifier CVE-2025-46556
GHSA Identifier GHSA-r3jf-hm7q-qfw5
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Mantisbt/mantisbt
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2025-46556

To remediate this vulnerability, upgrade all affected Mantisbt/mantisbt dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mantisbt/mantisbt fixed: 2.27.2 
Upgrade mantisbt/mantisbt to 2.27.2
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for mantisbt/mantisbt

How to Check if You Are Affected

To determine whether your application is affected by CVE-2025-46556, inspect your project dependencies for Mantisbt/mantisbt:

inspect dependencies for mantisbt/mantisbt

Analyze the terminal output to locate any version of Mantisbt/mantisbt in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.27.2), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. In Mantisbt/mantisbt, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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: ### Impact - The entire activity stream becomes unviewable (UI fails to render). - New notes cannot be displayed, effectively breaking all future collaboration on the issue. ### Patches Fixed in 2.27.2. ### Workarounds None ### Credits Thanks to Mazen Mahmoud (@TheAmazeng) for reporting the vulnerability.

CVE-2025-46556 Affected Mantisbt/mantisbt Versions

1 component(s)
Fixed Versions:
2.27.2
Product / Package Ecosystem Affected Versions Fixed Version
mantisbt/mantisbt
 Packagist
< 2.27.2
2.27.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5
NVD — CVE-2025-46556 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-46556
Security Fix Commit FIX COMMIT
https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234
Security Fix Commit FIX COMMIT
https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238
Security Fix Commit FIX COMMIT
https://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361
Mantisbt/mantisbt Source Repository REPOSITORY
https://github.com/mantisbt/mantisbt

Frequently Asked Questions

What is CVE-2025-46556?
CVE-2025-46556 is a security vulnerability in Mantisbt/mantisbt involving MantisBT Vulnerable to Denial-of-Service (DoS) via Excessive Note Length under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Mantisbt/mantisbt versions are affected?
Affected versions include releases prior to 2.27.2 across affected packages: mantisbt/mantisbt.
What version fixes CVE-2025-46556?
Upgrading to 2.27.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is mantisbt/mantisbt affected?
Yes, mantisbt/mantisbt is affected in releases prior to 2.27.2. Upgrade your dependency to 2.27.2 or later.
What is the CVSS score of CVE-2025-46556?
CVE-2025-46556 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2025-46556?
CVE-2025-46556 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check Packagist dependencies for CVE-2025-46556?
Run the dependency tree command: 'inspect dependencies for mantisbt/mantisbt'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r3jf-hm7q-qfw5",
  "modified" : "2025-11-04T16:55:30Z",
  "published" : "2025-11-03T17:07:39Z",
  "aliases" : [ "CVE-2025-46556" ],
  "summary" : "MantisBT Vulnerable to Denial-of-Service (DoS) via Excessive Note Length",
  "details" : "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" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "mantisbt/mantisbt"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.27.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/security/advisories/GHSA-r3jf-hm7q-qfw5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-46556"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/commit/c99a41272532ba49b5c8dccb7797afead9864234"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/commit/d5cec6bffb44d54bd412c186b9baa409b1aa4238"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mantisbt/mantisbt/commit/e9119c68b4a0eaa0bbde3deb121e81f5f7157361"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mantisbt/mantisbt"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-11-03T17:07:39Z",
    "nvd_published_at" : "2025-11-04T01:15:33Z"
  }
}