Memory Exhaustion Vulnerability in Mattermost by Mattermost
CVE-2026-25780

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 March 2026

What is CVE-2026-25780?

Mattermost versions 11.3.x up to 11.3.0, 11.2.x up to 11.2.2, and 10.11.x up to 10.11.10 are susceptible to a vulnerability that fails to properly bound memory allocation while processing DOC files. An authenticated attacker can exploit this flaw by uploading a specially crafted DOC file, leading to potential server memory exhaustion and denial of service, disrupting the service for legitimate users.

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Affected Version(s)

Mattermost 11.3.0

Mattermost 11.2.0 <= 11.2.2

Mattermost 10.11.0 <= 10.11.10

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Juho Forsén
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