---
id: CVE-2024-24988
aliases:
  - GHSA-6mx3-9qfh-77gj
  - BIT-mattermost-2024-24988
  - GO-2024-2589
title: Mattermost denial of service through long emoji value
summary: Mattermost denial of service through long emoji value
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
vendor: mattermost
product: github.com/mattermost/mattermost/server/v8
ecosystem: go
affected:
  - 'github.com/mattermost/mattermost/server/v8 >= 9.3.0, < 9.3.1'
  - 'github.com/mattermost/mattermost/server/v8 >= 9.2.0, < 9.2.5'
patched:
  - github.com/mattermost/mattermost/server/v8 9.3.1
  - github.com/mattermost/mattermost/server/v8 9.2.5
published: '2024-02-29'
updated: '2026-08-07'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-6mx3-9qfh-77gj'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2024-24988'
  - url: 'https://github.com/mattermost/mattermost'
  - url: 'https://mattermost.com/security-updates'
tags:
  - osv
  - go
epss: 0.0068
epssPercentile: 0.50252
ingestedAt: '2026-08-07T19:14:15.941Z'
---

## Overview

Mattermost fails to properly validate the length of the emoji value in the custom user status, allowing an attacker to send multiple times a very long string as an emoji value causing high resource consumption and possibly crashing the server.



## Affected packages

- `github.com/mattermost/mattermost/server/v8 >= 9.3.0, < 9.3.1`
- `github.com/mattermost/mattermost/server/v8 >= 9.2.0, < 9.2.5`

## Remediation

Upgrade to a patched release:

- `github.com/mattermost/mattermost/server/v8 9.3.1`
- `github.com/mattermost/mattermost/server/v8 9.2.5`