TI-2026-33459 Aliases CVE-2026-45720 GHSA-5x9f-6vg5-qg4m

Omni: TOCTOU race condition allows multiple concurrent uses of a single-use SAML session token

LOW 32CWE-294Published 2026-09-17 · Updated 2026-09-17

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-294.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00143 3rd percentileScored 2026-11-07

Fix Fixed omni (siderolabs): 1.6.6, 1.7.3github.com/siderolabs/omni (Go): 1.6.6, 1.7.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
siderolabs	omni	before 1.6.6; 1.7.0 to before 1.7.3	1.6.6, 1.7.3	Patch available	CNA
—	github.com/siderolabs/omni (Go)	before 1.6.6	1.6.6	Patch available	GHSA-5x9f-6vg5-qg4m
—	github.com/siderolabs/omni (Go)	1.7.0 to before 1.7.3	1.7.3	Patch available	GHSA-5x9f-6vg5-qg4m

omni Vendorsiderolabs Affected before 1.6.6; 1.7.0 to before 1.7.3 Fixed in 1.6.6, 1.7.3 Patch available CNA
github.com/siderolabs/omni (Go) Vendor— Affected before 1.6.6 Fixed in 1.6.6 Patch available GHSA-5x9f-6vg5-qg4m
github.com/siderolabs/omni (Go) Vendor— Affected 1.7.0 to before 1.7.3 Fixed in 1.7.3 Patch available GHSA-5x9f-6vg5-qg4m

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:siderolabs:omni::::::::	—	—	siderolabs

cpe:2.3:a:siderolabs:omni:*:*:*:*:*:*:*:* Versions — — ·siderolabs

Remediation

Fix · CNA omni (siderolabs) Fixed in 1.6.6, 1.7.3
Fix · GHSA-5x9f-6vg5-qg4m github.com/siderolabs/omni (Go) Fixed in 1.6.6 Advisory →
Fix · GHSA-5x9f-6vg5-qg4m github.com/siderolabs/omni (Go) Fixed in 1.7.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-45720
2026-10-03 Alias added: GHSA-5x9f-6vg5-qg4m

References

Other 8

TI-2025-37275 Omni is Vulnerable to DoS via Empty Create/Update Resource Requests CVSS 3.1HIGH 7.5
TI-2025-38119 Omni leaks information via the API CVSS 3.1HIGH 8.6
TI-2022-16526 Talos worker join token can be used to get elevated access level to the Talos API CVSS 3.1HIGH 8.8
TI-2026-33464 Omni: Reader-level users can retrieve imported cluster CA keys via ResourceService CVSS 3.1HIGH 7.6
TI-2026-74326 Talos Linux support bundles include unredacted registry credentials CVSS 3.1LOW 3.3
TI-2026-33462 Omni: Operator can traverse image-factory API paths via unsanitized `talos_version` in CreateSchematic CVSS 3.1LOW 2.7

See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences