PT-2026-25686 · Mattermost · Mattermost

Juho Forsén · Published 2026-03-16 · Updated 2026-03-16 · CVE-2026-26246

Mitre

CVSS v3.1

4.3

4.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when processing PSD image files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted PSD file. Mattermost Advisory ID: MMSA-2026-00572

Fix

Weakness Enumeration

CWE-789

Related Identifiers

CVE-2026-26246

Affected Products

Mattermost

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-26246 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://twitter.com/CVEnew/status/2033583662009356595 · Twitter Post