CVE-2026-26246
Memory Exhaustion via PSD Processing in Mattermost Server
Publication date: 2026-03-16
Last updated on: 2026-03-18
Assigner: Mattermost, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mattermost | mattermost_server | From 10.11.0 (inc) to 10.11.11 (exc) |
| mattermost | mattermost_server | From 11.2.0 (inc) to 11.2.3 (exc) |
| mattermost | mattermost_server | From 11.3.0 (inc) to 11.3.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-789 | The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in Mattermost versions 11.3.0 and earlier in the 11.3.x series, 11.2.2 and earlier in the 11.2.x series, and 10.11.10 and earlier in the 10.11.x series. It occurs because the software fails to properly limit memory allocation when processing PSD image files.
An authenticated attacker can exploit this by uploading a specially crafted PSD file, which causes the server to exhaust its memory resources.
This leads to a denial of service condition on the server.
How can this vulnerability impact me? :
The primary impact of this vulnerability is a denial of service (DoS) on the Mattermost server.
By uploading a specially crafted PSD file, an authenticated attacker can cause the server to consume excessive memory, potentially leading to server crashes or unavailability.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know