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CVE-2026-26233

🗓️ 26 Mar 2026 17:00:36Reported by redhat.comType 
redhatcve
 redhatcve
🔗 access.redhat.com👁 14 Views

Unauthenticated attackers can crash and restart Mattermost servers via HTTP/2 login flood on vulnerable versions.

Related
Refs
ReporterTitlePublishedViews
Family
circl
Circl
CVE-2026-26233
25 Mar 202618:22
–circl
cnnvd
CNNVD
Mattermost 安全漏洞
25 Mar 202600:00
–cnnvd
cve
CVE
CVE-2026-26233
25 Mar 202616:24
–cve
cvelist
Cvelist
CVE-2026-26233 Denial of Service via HTTP/2 single packet attack on login endpoint
25 Mar 202616:24
–cvelist
euvd
EUVD
EUVD-2026-15756
25 Mar 202618:31
–euvd
github
Github Security Blog
Mattermost doesn't rate limit login requests, allowing DoS
25 Mar 202618:31
–github
mend
Mend
CVE-2026-26233
25 Mar 202616:24
–mend
nvd
NVD
CVE-2026-26233
25 Mar 202617:16
–nvd
osv
OSV
GHSA-247X-7QW8-FP98 Mattermost doesn't rate limit login requests, allowing DoS
25 Mar 202618:31
–osv
osv
OSV
OPENSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb
30 Jul 202609:09
–osv
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26 Mar 2026 17:00Current
8High risk
Vulners AI Score8
CVSS 3.14.3 - 6.5
EPSS0.00523
14