Lucene search
+L

PT-2026-42750

🗓️ 22 May 2026 00:00:00Reported by Positive TechnologiesType 
ptsecurity
 ptsecurity
🔗 dbugs.ptsecurity.com👁 27 Views

Mattermost versions 10.11.x to 11.6.x allow unauthenticated remote crash via crafted msgpack WebSocket frames.

Related
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-5740
22 May 202610:22
–attackerkb
bdu_fstec
BDU FSTEC
msgpack Module DoS
1 Jun 202600:00
–bdu_fstec
circl
Circl
CVE-2026-5740
22 May 202612:45
–circl
cnnvd
CNNVD
Mattermost security vulnerabilities
22 May 202600:00
–cnnvd
cve
CVE
CVE-2026-5740
22 May 202610:22
–cve
cvelist
Cvelist
CVE-2026-5740 Unauthenticated WebSocket binary frame causes denial of service in Mattermost Server
22 May 202610:22
–cvelist
euvd
EUVD
EUVD-2026-31426
22 May 202610:22
–euvd
github
Github Security Blog
Mattermost doesn't properly validate msgpack-encoded WebSocket frames before memory allocation
26 May 202613:30
–github
mend
Mend
CVE-2026-5740
22 May 202610:22
–mend
nvd
NVD
CVE-2026-5740
22 May 202611:16
–nvd
Rows per page

Data

Build on a solid foundation with Vulners data

We provide the essential building blocks for cybersecurity solutions with comprehensive, structured, and constantly updated vulnerability and exploits data

Api

Power your application with Vulners API

The Vulners REST API offers reliable, high-performance access to vulnerability intelligence, with 99.9% SLA uptime and CDN-backed data delivery for seamless global access

App

Assess and manage vulnerabilities with Vulners tools

Built on top of Vulners' database and SDK, end-user solutions give security professionals and developers lightweight and powerful tools for vulnerability remediation

30 Jul 2026 00:00Current
7.7High risk
Vulners AI Score7.7
CVSS 27.8
CVSS 3.17.5
EPSS0.0034
SSVC
27