CVE-2026-12882
- Source
- https://cve.org/CVERecord?id=CVE-2026-12882
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12882.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-12882
- Downstream
- Published
- 2026-09-14T10:30:39Z
- Modified
- 2026-10-09T02:49:21Z
- Severity
-
- 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- Mattermost Markdown autolink parsing denial of service
- Details
-
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 parse Markdown autolinks with unmatched trailing closing parentheses in linear time, which allows an authenticated user with permission to create posts to cause excessive server CPU consumption and degrade availability for other users via specially crafted post or message attachment content. Mattermost Advisory ID: MMSA-2026-00703
- Database specific
{ "cna_assigner": "Mattermost", "cwe_ids": [ "CWE-407" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12882.json", "unresolved_ranges": [ { "extracted_events": [ { "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" }, { "introduced": "11.9.0" }, { "last_affected": "11.9.0" } ], "source": "AFFECTED_FIELD" } ] }- References
Affected packages
Git / github.com/mattermost/mattermost
Affected ranges
- Type
- GIT
- Repo
- https://github.com/mattermost/mattermost
- Events
-
IntroducedFixedIntroducedFixedIntroducedFixedIntroducedFixed
- Database specific
-
Show details
{ "cpe": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "10.11.0" }, { "fixed": "10.11.23" }, { "introduced": "11.7.0" }, { "fixed": "11.7.8" }, { "introduced": "11.8.0" }, { "fixed": "11.8.5" }, { "introduced": "11.9.0" }, { "fixed": "11.9.1" } ], "source": "CPE_RANGE" }
Affected versions
@mattermost/client@10.*
@mattermost/client@10.11.0
@mattermost/client@11.*
@mattermost/client@11.7.0
@mattermost/client@11.8.0
@mattermost/client@11.9.0
@mattermost/shared@11.*
@mattermost/shared@11.7.0
@mattermost/shared@11.8.0
@mattermost/shared@11.9.0
@mattermost/types@10.*
@mattermost/types@10.11.0
@mattermost/types@11.*
@mattermost/types@11.7.0
@mattermost/types@11.8.0
@mattermost/types@11.9.0
mattermost-redux@10.*
mattermost-redux@10.11.0
mattermost-redux@11.*
mattermost-redux@11.7.0
mattermost-redux@11.8.0
mattermost-redux@11.9.0
v10.*
v10.11.0
v10.11.0-rc3
v10.11.1
v10.11.1-rc1
v10.11.10
v10.11.11
v10.11.11-rc1
v10.11.11-rc2
v10.11.12
v10.11.13
v10.11.13-rc1
v10.11.14
v10.11.14-rc1
v10.11.15
v10.11.15-rc1
v10.11.16
v10.11.17
v10.11.18
v10.11.19
v10.11.19-rc1
v10.11.2
v10.11.2-rc1
v10.11.2-rc2
v10.11.20
v10.11.21
v10.11.22
v10.11.3
v10.11.4
v10.11.4-rc1
v10.11.4-rc2
v10.11.4-rc3
v10.11.5
v10.11.6
v10.11.7
v10.11.8
v10.11.9
v10.11.9-rc1
v11.*
v11.7.0
v11.7.1
v11.7.2
v11.7.3
v11.7.4
v11.7.5
v11.7.5-rc1
v11.7.6
v11.7.7
v11.8.0
v11.8.0-rc5
v11.8.1
v11.8.2
v11.8.3
v11.8.4
v11.9.0