CVE-2026-45720
Omni: TOCTOU race condition allows multiple concurrent uses of a single-use SAML session token
- 7.0HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 96% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By GitHub_M
- 4 months later
· 4 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 96% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.0.
Affected products
- affected < 1.6.6
- affected >= 1.7.0, < 1.7.3
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/siderolabs/omniGHSA-5x9f-6vg5-qg4m (opens in a new tab)
References
References7
- https://github.com/siderolabs/omni/security/advisories/GHSA-5x9f-6vg5-qg4m (opens in a new tab)x_refsource_CONFIRM
- https://github.com/siderolabs/omni/pull/2816 (opens in a new tab)x_refsource_MISC
- https://github.com/siderolabs/omni/commit/272d3f4dd00e778b39fde09afde35575fe13ef13 (opens in a new tab)x_refsource_MISC
- https://github.com/siderolabs/omni/commit/4c4c1e2d8226914f26774a309a91595f168ee921 (opens in a new tab)x_refsource_MISC
- https://github.com/siderolabs/omni/commit/ced79da6c032d2103803eb53343d0916cc957d2a (opens in a new tab)x_refsource_MISC
- https://github.com/siderolabs/omni/releases/tag/v1.6.6 (opens in a new tab)x_refsource_MISC
- https://github.com/siderolabs/omni/releases/tag/v1.7.3 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-82403 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-5x9f-6vg5-qg4m (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-45720)Record last updated .