CVE-2026-25780: Mattermost fails to bound memory allocation when processing DOC files

March 16, 2026 (updated March 17, 2026)

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

References

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

Code Behaviors & Features

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