GHSA-34g8-9fpp-46ch

Suggest an improvement
Source
https://github.com/advisories/GHSA-34g8-9fpp-46ch
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-34g8-9fpp-46ch/GHSA-34g8-9fpp-46ch.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-34g8-9fpp-46ch
Aliases
Published
2026-03-16T15:30:43Z
Modified
2026-03-26T21:11:03.241919Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Mattermost fails to limit the size of responses from integration action endpoints
Details

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 Mattermost fails to limit the size of responses from integration action endpoints, which allows an authenticated attacker to cause server memory exhaustion and denial of service via a malicious integration server that returns an arbitrarily large response when a user clicks an interactive message button. Mattermost Advisory ID: MMSA-2026-00571

Database specific 
{
    "github_reviewed": true,
    "nvd_published_at": "2026-03-16T14:19:29Z",
    "cwe_ids": [
        "CWE-789"
    ],
    "github_reviewed_at": "2026-03-17T20:01:22Z",
    "severity": "MODERATE"
}
References

Affected packages

Go
github.com/mattermost/mattermost/server/v8

Package

Name
github.com/mattermost/mattermost/server/v8
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost/server/v8

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
8.0.0-20260127165411-fe3052073dc6

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-34g8-9fpp-46ch/GHSA-34g8-9fpp-46ch.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.3.2-0.20260127165411-fe3052073dc6

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-34g8-9fpp-46ch/GHSA-34g8-9fpp-46ch.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
10.11.0-rc1
Fixed
10.11.11

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-34g8-9fpp-46ch/GHSA-34g8-9fpp-46ch.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
11.2.0-rc1
Fixed
11.2.3

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-34g8-9fpp-46ch/GHSA-34g8-9fpp-46ch.json"
github.com/mattermost/mattermost-server

Package

Name
github.com/mattermost/mattermost-server
View open source insights on deps.dev
Purl
pkg:golang/github.com/mattermost/mattermost-server

Affected ranges

Type
SEMVER
Events
Introduced
11.3.0-rc1
Fixed
11.3.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-34g8-9fpp-46ch/GHSA-34g8-9fpp-46ch.json"