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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45720
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 20:16:49 UTC
Updated2026-09-24 21:25:27 UTC
DescriptionOmni 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.

Risk And Classification

Primary CVSS: v3.1 7 HIGH from [email protected]

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.001430000 probability, percentile 0.029270000 (date 2026-09-25)

Problem Types: CWE-294 | CWE-367 | CWE-294 CWE-294: Authentication Bypass by Capture-replay | CWE-367 CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED7HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Siderolabs Omni affected < 1.6.6 Not specified
CNA Siderolabs Omni affected >= 1.7.0, < 1.7.3 Not specified

References

ReferenceSourceLinkTags
github.com/siderolabs/omni/releases/tag/v1.7.3 [email protected] github.com
github.com/siderolabs/omni/commit/4c4c1e2d8226914f26774a309a91595f168ee921 [email protected] github.com
github.com/siderolabs/omni/commit/272d3f4dd00e778b39fde09afde35575fe13ef13 [email protected] github.com
github.com/siderolabs/omni/pull/2816 [email protected] github.com
github.com/siderolabs/omni/releases/tag/v1.6.6 [email protected] github.com
github.com/siderolabs/omni/security/advisories/GHSA-5x9f-6vg5-qg4m [email protected] github.com
github.com/siderolabs/omni/commit/ced79da6c032d2103803eb53343d0916cc957d2a [email protected] github.com
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