Allocation of Resources Without Limits or Throttling in Vert.x - CVE-2026-6860
Published: September 11, 2026
Vulnerability identifier: #VU148980
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-6860
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in the server-side SNI SslContext cache when handling TLS connections with server name indication. A remote attacker can send TLS connections with distinct server name indications to cause a denial of service.
Affected software
Vert.x
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2026-6860
Install security update from vendor's website.
Vert.x - addressed in versions 4.5.26, 5.0.12
Red Hat build of Keycloak - addressed in versions 26.4.13, 26.6.4
Red Hat build of Keycloak - addressed in versions 26.4.13, 26.6.4