Medium
Denial of service via unbounded document content extraction in Mattermost Server
Type: advisorySources: OSV
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to bound the time and resource consumption of server-side document content extraction which allows an authenticated user with file-upload permission to degrade file uploads for all users on the server via repeatedly uploading small documents that are cheap to upload but expensive to extract, saturating the shared extraction worker pool.. Mattermost Advisory ID: MMSA-2026-00694
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-10600
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 19:47 UTC · Revision 1
Source evidence
Denial of service via unbounded document content extraction in Mattermost Server
core-osv · Original sourcePublished 27 Jul 2026, 14:13 UTC
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to bound the time and resource consumption of server-side document content extraction which allows an authenticated user with file-upload permission to degrade file uploads for all users on the server via repeatedly uploading small documents that are cheap to upload but expensive to extract, saturating the shared extraction worker pool.. Mattermost Advisory ID: MMSA-2026-00694
osv:CVE-2026-10600
Complete source record
{
"id": "3d938b4d52cfd67cf8653da41cbbbf8a6fd41abe128bdc6c68fc8cff2141ce91",
"url": "https://osv.dev/vulnerability/CVE-2026-10600",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Denial of service via unbounded document content extraction in Mattermost Server",
"summary": "Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to bound the time and resource consumption of server-side document content extraction which allows an authenticated user with file-upload permission to degrade file uploads for all users on the server via repeatedly uploading small documents that are cheap to upload but expensive to extract, saturating the shared extraction worker pool.. Mattermost Advisory ID: MMSA-2026-00694",
"evidence": "osv:CVE-2026-10600",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-10600",
"aliases": [
"CVE-2026-10600"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/mattermost/mattermost",
"type": "GIT",
"events": [
{
"introduced": "5b955468ea1ea8b56c0fb10feb258a36a767d7bb"
},
{
"fixed": "638007314e9dde1575d3caa167e1067b1c577204"
},
{
"introduced": "d4f4e78835e86e2e76f76bfe797623076f5c9835"
},
{
"fixed": "aa548ce407dac894c70983decc17fb263b1aa683"
},
{
"introduced": "a9e574a82633915f22071f0d7ca2b006f249ec2a"
},
{
"fixed": "e14401f2944912c0efc21f960ae64e23b04dfe80"
},
{
"introduced": "e8bd2b8a871cbeff6943bead62328478118188df"
},
{
"fixed": "358e15f91c4acbd39a2457913398681a65c95b18"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "10.11.0"
},
{
"fixed": "10.11.21"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.6.0"
},
{
"fixed": "11.6.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.7.0"
},
{
"fixed": "11.7.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.8.0"
},
{
"fixed": "11.8.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v11.6.5",
"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",
"v11.6.4",
"v10.11.19-rc1",
"v11.7.2",
"v11.6.3",
"v10.11.18",
"v11.7.1",
"v11.6.2",
"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",
"v11.6.1-rc1",
"v11.6.1",
"v10.11.14",
"v11.6.0",
"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-2026-10600.json"
}
}
],
"modified": "2026-10-28T02:30:38.779468588Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10600.json",
"https://mattermost.com/security-updates",
"https://nvd.nist.gov/vuln/detail/CVE-2026-10600"
],
"provider_metadata": {
"cwe_ids": [
"CWE-770"
],
"cna_assigner": "Mattermost",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "11.8.0"
},
{
"last_affected": "11.8.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandaloneSingleVersion"
}
]
},
{
"extracted_events": [
{
"range": [
{
"introduced": "11.7.0"
},
{
"last_affected": "11.7.3"
},
{
"introduced": "11.6.0"
},
{
"last_affected": "11.6.5"
},
{
"introduced": "10.11.0"
},
{
"last_affected": "10.11.20"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10600.json"
}
},
"related_cves": [
{
"value": "CVE-2026-10600",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 506333,
"published_at": "2026-07-27T14:13:29.962+00:00"
}