Memory Exhaustion Vulnerability in Mattermost Products
CVE-2026-26246

4.3MEDIUM

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 March 2026

What is CVE-2026-26246?

Certain versions of Mattermost are susceptible to a memory exhaustion vulnerability triggered by the processing of specially crafted PSD image files. An authenticated attacker can exploit this flaw by uploading a malicious PSD file, leading to server memory exhaustion and potential Denial of Service (DoS). It is crucial for users of Mattermost versions 11.3.x, 11.2.x, and 10.11.x to take immediate action to mitigate this risk.

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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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