CVE-2026-2454

EUVD-2026-12510
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to handle incorrectly reported array lengths which allows malicious user to cause OOM errors and crash the server via sending corrupted msgpack frames within websocket messages to calls plugin. Mattermost Advisory ID: MMSA-2025-00537
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
MattermostCNA
5.8 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 31%
Affected Products (NVD)
VendorProductVersion
mattermostmattermost_server
10.11.0 ≤
𝑥
< 10.11.11
mattermostmattermost_server
11.2.0 ≤
𝑥
< 11.2.3
mattermostmattermost_server
11.3.0 ≤
𝑥
< 11.3.1
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mattermostmattermost
𝑥
≤ 11.3.0
CNA
mattermostmattermost
11.2.0 ≤
𝑥
≤ 11.2.2
CNA
mattermostmattermost
10.11.0 ≤
𝑥
≤ 10.11.10
CNA
Common Weakness Enumeration
References
https://mattermost.com/security-updates