CVE-2026-3114

[CVE-Katalog]

A flaw was found in Mattermost. Authenticated users with file upload permissions can exploit this vulnerability by uploading specially crafted zip archives, known as "zip bombs," which contain highly compressed entries. When these archives are decompressed, they exhaust server memory, leading to a denial of service (DoS) for the application. Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Schweregrad

Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Published

Mar 26, 2026, 4:21:19 PM UTC

Source

[NVD] · [CVE record]

EPSS

0.36% · Oct 27, 2026

{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "mattermost_server",
      "fixed_version": "10.11.12",
      "applicability_unknown": true
    },
    {
      "name": "mattermost_server",
      "fixed_version": "11.2.4",
      "applicability_unknown": true
    },
    {
      "name": "mattermost_server",
      "fixed_version": "11.3.2",
      "applicability_unknown": true
    },
    {
      "name": "mattermost_server",
      "fixed_version": "",
      "applicability_unknown": true
    }
  ]
}