Medium
Boards archive import endpoint allows resource exhaustion via zip bomb and file size limit bypass in Mattermost
Type: advisorySources: OSV
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk consumption via a crafted .boardarchive file uploaded to the import endpoint.. Mattermost Advisory ID: MMSA-2026-00713
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-14298
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:10 UTC · Revision 1
Source evidence
Boards archive import endpoint allows resource exhaustion via zip bomb and file size limit bypass in Mattermost
core-osv · Original sourcePublished 13 Aug 2026, 08:03 UTC
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk consumption via a crafted .boardarchive file uploaded to the import endpoint.. Mattermost Advisory ID: MMSA-2026-00713
osv:CVE-2026-14298
Complete source record
{
"id": "b9d4b6e50f79c5651868f5dd084979e5b62bbf624078d540539b0619b42584c2",
"url": "https://osv.dev/vulnerability/CVE-2026-14298",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Boards archive import endpoint allows resource exhaustion via zip bomb and file size limit bypass in Mattermost",
"summary": "Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to limit decompressed content size and enforce the configured maximum file size in the Boards archive import handler, which allows an authenticated user to cause memory exhaustion or unbounded disk consumption via a crafted .boardarchive file uploaded to the import endpoint.. Mattermost Advisory ID: MMSA-2026-00713",
"evidence": "osv:CVE-2026-14298",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-14298",
"aliases": [
"CVE-2026-14298"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost",
"type": "GIT",
"events": [
{
"introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
},
{
"fixed": "075d003e1391ff0b24eca1e63b0222eb46eaded6"
},
{
"introduced": "a9e574a82633915f22071f0d7ca2b006f249ec2a"
},
{
"fixed": "d42004bb3046de3ed176938a34b1a70c1c3d9421"
},
{
"introduced": "e8bd2b8a871cbeff6943bead62328478118188df"
},
{
"fixed": "d9c17e42b19c27dfac0ebe6840d954a41e626890"
},
{
"introduced": "583461af10fc9b2aef2871c722fc4376db695832"
},
{
"fixed": "1f738d345805168964a55e5860aac9c747dceb78"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.11.0"
},
{
"fixed": "10.11.23"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.7.0"
},
{
"fixed": "11.7.8"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.8.0"
},
{
"fixed": "11.8.5"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.9.0"
},
{
"fixed": "11.9.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v11.8.4",
"v11.7.7",
"v10.11.22",
"v11.9.0",
"mattermost-redux@11.9.0",
"@mattermost/types@11.9.0",
"@mattermost/shared@11.9.0",
"@mattermost/client@11.9.0",
"v11.8.3",
"v10.11.21",
"v11.7.6",
"v11.8.2",
"v11.7.5-rc1",
"v11.7.5",
"v11.8.1",
"v11.7.4",
"v11.7.3",
"v10.11.20",
"v11.8.0-rc5",
"v11.8.0",
"mattermost-redux@11.8.0",
"@mattermost/types@11.8.0",
"@mattermost/shared@11.8.0",
"@mattermost/client@11.8.0",
"v10.11.19",
"v10.11.19-rc1",
"v11.7.2",
"v10.11.18",
"v11.7.1",
"v10.11.17",
"v10.11.16",
"v11.7.0",
"mattermost-redux@11.7.0",
"@mattermost/types@11.7.0",
"@mattermost/shared@11.7.0",
"@mattermost/client@11.7.0",
"v10.11.15-rc1",
"v10.11.15",
"v10.11.14",
"v10.11.14-rc1",
"v10.11.13",
"v10.11.13-rc1",
"v10.11.12",
"v10.11.11-rc2",
"v10.11.11",
"v10.11.11-rc1",
"v10.11.10",
"v10.11.9",
"v10.11.9-rc1",
"v10.11.8",
"v10.11.7",
"v10.11.6",
"v10.11.5",
"v10.11.4-rc3",
"v10.11.4",
"v10.11.4-rc2",
"v10.11.4-rc1",
"v10.11.3",
"v10.11.2-rc2",
"v10.11.2",
"v10.11.2-rc1",
"v10.11.1",
"v10.11.1-rc1",
"v10.11.0-rc3",
"v10.11.0",
"mattermost-redux@10.11.0",
"@mattermost/types@10.11.0",
"@mattermost/client@10.11.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-14298.json"
}
}
],
"modified": "2026-10-28T02:30:30.517527160Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14298.json",
"https://mattermost.com/security-updates",
"https://nvd.nist.gov/vuln/detail/CVE-2026-14298"
],
"provider_metadata": {
"cwe_ids": [
"CWE-409"
],
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "11.9.0"
},
{
"last_affected": "11.9.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "11.8.0"
},
{
"last_affected": "11.8.4"
},
{
"introduced": "11.7.0"
},
{
"last_affected": "11.7.7"
},
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.22"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14298.json"
}
},
"related_cves": [
{
"value": "CVE-2026-14298",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 497715,
"published_at": "2026-08-13T08:03:00.397+00:00"
}