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Mattermost fails to limit the size of responses from integration action endpoints

🗓️ 16 Mar 2026 15:30:43Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 26 Views

Mattermost fails to limit response size at integration endpoints, enabling authenticated memory exhaustion and denial of service.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-2456
16 Mar 202611:06
–attackerkb
bdu_fstec
BDU FSTEC
Mattermost Uncontrolled Resource Consumption DoS
13 May 202600:00
–bdu_fstec
circl
Circl
CVE-2026-2456
16 Feb 202600:00
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
16 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-2456
16 Mar 202611:06
–cve
cvelist
Cvelist
CVE-2026-2456 Denial of Service via Unbounded Memory Allocation in Integration Actions
16 Mar 202611:06
–cvelist
euvd
EUVD
EUVD-2026-12383
16 Mar 202615:30
–euvd
mend
Mend
CVE-2026-2456
16 Mar 202611:06
–mend
nvd
NVD
CVE-2026-2456
16 Mar 202614:19
–nvd
osv_ghsa
osv_ghsa
GHSA-34G8-9FPP-46CH Mattermost fails to limit the size of responses from integration action endpoints
16 Mar 202615:30
–osv_ghsa
Rows per page
Vulners
Node
OR
mattermostmattermost-serverRange11.3.0-rc1–11.3.1go
mattermostmattermost-serverRange11.2.0-rc1–11.2.3go
mattermostmattermost-serverRange10.11.0-rc1–10.11.11go
mattermostmattermost-serverRange<5.3.2-0.20260127165411-fe3052073dc6go
mattermostmattermostRange<8.0.0-20260127165411-fe3052073dc6go

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17 Mar 2026 20:01Current
6.5Medium risk
Vulners AI Score6.5
CVSS 3.15.3 - 5.7
EPSS0.00168
SSVC
26