Denial of Service via Unbounded Memory Allocation in Integration Actions
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible, 8.0.0-20260127165411-fe3052073dc6, 5.3.2-0.20260127165411-fe3052073dc6, and 3 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Mattermost Mattermost
From 11.3.0 · through 11.3.0; From 11.2.0 · through 11.2.2; From 10.11.0 · through 10.11.10
- github.com/mattermost/mattermost-serverGo
From 10.11.0-rc1+incompatible · fixed in 10.11.11+incompatible; From 11.2.0-rc1+incompatible · fixed in 11.2.3+incompatible; From 11.3.0-rc1+incompatible · fixed in 11.3.1+incompatible
- github.com/mattermost/mattermost-server/v5Go
All versions
- github.com/mattermost/mattermost-server/v6Go
All versions
- github.com/mattermost/mattermost/server/v8Go
fixed in 8.0.0-20260127165411-fe3052073dc6
- github.com/mattermost/mattermost-serverGo
fixed in 5.3.2-0.20260127165411-fe3052073dc6
- github.com/mattermost/mattermost-serverGo
From 10.11.0-rc1 · fixed in 10.11.11
- github.com/mattermost/mattermost-serverGo
From 11.2.0-rc1 · fixed in 11.2.3
- github.com/mattermost/mattermost-serverGo
From 11.3.0-rc1 · fixed in 11.3.1