CVE-2026-45720
Omni: TOCTOU race condition allows multiple concurrent uses of a single-use SAML session token
Omni manages Kubernetes on bare metal, virtual machines, or in a cloud. Prior to 1.6.6 and from 1.7.0 until 1.7.3, SAML.getSession in internal/pkg/auth/interceptor/saml.go checks SAMLAssertion.Used and marks it used in separate state operations. Concurrent requests carrying the same captured saml-session token can each observe the assertion as unused and obtain authentication as the victim before either update is visible. The attacker can invoke SAML-protected gRPC endpoints, use ConfirmPublicKey to create multiple persistent credentials tied to the victim, and generate audit entries attributed to the victim, with the resulting access potentially affecting confidentiality, integrity, and availability according to the victim's privileges. This issue is fixed in versions 1.6.6 and 1.7.3.
| CWE | CWE-294 CWE-367 |
| Vendor | siderolabs |
| Product | omni |
| Published | Sep 17, 2026 |
| Last Updated | Sep 17, 2026 |
Get instant alerts for siderolabs omni
Be the first to know when new high vulnerabilities affecting siderolabs omni are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H