Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate 7zip archive structure before processing which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted 7zip file with excessive folder declarations.. Mattermost Advisory ID: MMSA-2026-00573
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Mon, 18 May 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Mon, 18 May 2026 09:45:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Mon, 18 May 2026 08:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to validate 7zip archive structure before processing which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted 7zip file with excessive folder declarations.. Mattermost Advisory ID: MMSA-2026-00573 | |
| Title | Memory Exhaustion via Malicious 7zip File Upload | |
| Weaknesses | CWE-789 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-05-18T12:43:56.170Z
Reserved: 2026-04-15T10:30:19.937Z
Link: CVE-2026-6340
Updated: 2026-05-18T12:43:49.626Z
Status : Undergoing Analysis
Published: 2026-05-18T08:16:14.450
Modified: 2026-05-18T17:32:38.127
Link: CVE-2026-6340
No data.
OpenCVE Enrichment
Updated: 2026-05-18T10:00:13Z