CVE-2026-2456CWE-789

Denial of Service via Unbounded Memory Allocation in Integration Actions

Medium · published March 16, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
5.8
In the wild
Unconfirmed
What it is

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the size of responses from integration action endpoints, which allows an authenticated attacker to cause server memory exhaustion and denial of service via a malicious integration server that returns an arbitrarily large response when a user clicks an interactive message button.. Mattermost Advisory ID: MMSA-2026-00571

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00168 · 5.8th percentile
Weakness
CWE-789 · Memory Allocation with Excessive Size Value
Published
2026-03-16T11:06Z
EPSS history
Timeline
  • 16 MAR 11:06Z
    Denial of Service via Unbounded Memory Allocation in Integration Actions
    cvelistv5