PT-2026-25686 · Mattermost · Mattermost

Juho Forsén · Published 2026-02-13 · Updated 2026-03-27 · CVE-2026-26246

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.10 Mattermost versions 11.2.0 through 11.2.2 Mattermost versions 11.3.0

Description The software does not properly limit memory allocation when processing PSD image files. This allows an authenticated attacker to exhaust server memory and cause a denial of service by uploading a specially crafted PSD file.

Recommendations Update Mattermost to a version beyond 10.11.10. Update Mattermost to a version beyond 11.2.2. Update Mattermost to a version beyond 11.3.0.

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

CWE-789

Related Identifiers

BDU:2026-06568

CVE-2026-26246

GHSA-44MV-JQ72-GJ49

GO-2026-4727

SUSE-SU-2026:1135-1

Affected Products

Mattermost

References · 150

• https://osv.dev/vulnerability/SUSE-SU-2026:1135-1 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2026-4727 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-26246 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06568 · Security Note
• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-26246 · Security Note
• https://osv.dev/vulnerability/GHSA-44mv-jq72-gj49 · Vendor Advisory
• https://github.com/mattermost/mattermost · Note
• https://github.com/mattermost/mattermost/commit/38b413a27604e8721fbe008f8ec4b4e6c47ad4f0 · Note
• https://suse.com/security/cve/CVE-2026-22545 · Note
• https://suse.com/security/cve/CVE-2026-33281 · Note
• https://suse.com/security/cve/CVE-2026-33132 · Note
• https://suse.com/security/cve/CVE-2026-33191 · Note
• https://suse.com/security/cve/CVE-2026-33066 · Note
• https://suse.com/security/cve/CVE-2026-33315 · Note