Omni: Operator can traverse image-factory API paths via unsanitized talos_version in CreateSchematic

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-45723: 0.49% estimated exploitation activity in the next 30 days; percentile 42.46 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary managementServer.CreateSchematic (internal/backend/grpc/schematics.go) passes the caller-controlled TalosVersion field directly to imageFactoryClient.OverlaysVersions, which embeds it verbatim into a fmt.Sprintf("/version/%s/overlays/official", talosVersion) path template. url.URL.JoinPath resolves any ../ sequences in that path, allowing an authenticated Operator to rewrite the URL path and force Omni to issue HTTP GET requests to unintended paths on the configured image-factory server. Error body content from those unintended endpoints is returned to the caller. Severity - Attack Vector: Network: exploited via the gRPC CreateSchematic API endpoint. - Attack Complexity: Low: once the attacker holds an Operator credential and has identified a media ID with an overlay, exploitation is a single API call. - Privileges Required: High: role.Operator is required, which has administrative capabilities on Omni. - User Interaction: None. - Scope: Unchanged: the traversal is…

Published by the source

5 Jun 2026, 15:25 UTC

Last modified by the source

5 Jun 2026, 15:25 UTC

Source last checked

26 Oct 2026, 15:23 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-c66c-vq6w-fvh5

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# Patch Next advisory brief: CVE-2026-45723

Advisory: Omni: Operator can traverse image-factory API paths via unsanitized `talos_version` in CreateSchematic
IDs: CVE-2026-45723, GHSA-c66c-vq6w-fvh5
Record: https://patchnext.com/advisories/cve-2026-45723 (revision 1, source checked 26 Oct 2026, 15:23 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/siderolabs/omni 1.7.3, 1.6.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/siderolabs/omni: affected < 1.6.6; >= 1.7.0, < 1.7.3; fixed in 1.6.6, 1.7.3

## Suggested inspection (read-only)
- Go github.com/siderolabs/omni: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/siderolabs/omni.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-c66c-vq6w-fvh5 (GitHub-reviewed advisory GHSA-c66c-vq6w-fvh5 lists affected ranges: Go github.com/siderolabs/omni >=0 =1.7.0 <1.7.3)

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