CVE-2026-25780

Description

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 DOC files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted DOC file.. Mattermost Advisory ID: MMSA-2026-00581

Affected packages (6)

• Go/github.com/mattermost/mattermost-serverfrom 0, < 5.3.2-0.20260123215601-86797c508c44
• Go/github.com/mattermost/mattermost-server>= 10.11.0-rc1+incompatible, < 10.11.11+incompatible, >= 11.2.0-rc1+incompatible, < 11.2.3+incompatible, >= 11.3.0-rc1+incompatible, < 11.3.1+incompatible
• Go/github.com/mattermost/mattermost-server/v5from 0
• Go/github.com/mattermost/mattermost-server/v6from 0
• Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20260123215601-86797c508c44
• Go/github.com/mattermost/mattermost/server/v8from 0, < 8.0.0-20260123215601-86797c508c44

CVSS scores

References (5)

• ADVISORYhttps://github.com/advisories/GHSA-xv2p-wchj-qjhp
• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-25780
• PATCHhttps://github.com/mattermost/mattermost
• WEBhttps://github.com/mattermost/mattermost/commit/86797c508c444e299b20889ce241fde505a402cc
• WEBhttps://mattermost.com/security-updates