PT-2026-46988 · Go · Github.Com/Siderolabs/Omni

Published

2026-06-05

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Updated

2026-06-05

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CVE-2026-45723

CVSS v3.1

2.7

Low

VectorAV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

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 constrained to the configured image-factory host; the attacker cannot redirect Omni to an arbitrary external server.
  • Confidentiality Impact: Low: error body content from unintended image-factory endpoints is reflected back to the operator, potentially leaking server-internal information.
  • Integrity Impact: None: only HTTP GET requests are issued; no write operations are performed.
  • Availability Impact: None.

Impact

  • Same-host path traversal: An authenticated Operator can force Omni to issue GET requests to arbitrary URL paths on the configured image-factory server, bypassing the intended versioned overlay API structure.
  • Error-body disclosure: HTTP error responses from unintended image-factory endpoints are reflected back to the operator, potentially leaking server-internal diagnostics or sensitive path content.
  • Internal network probing: In deployments using a private image-factory instance on an internal network, the attacker can probe endpoint existence and partial responses through error-text differences.
  • Depth control: By varying the number of ../ prefixes in talosVersion, the attacker can reach any path hierarchy on the image-factory host.

Credit

This vulnerability was discovered and reported by bugbunny.ai.

Fix

RCE

SSRF

Generation of Error Message Containing Sensitive Information

Path traversal

Related Identifiers

CVE-2026-45723
GHSA-C66C-VQ6W-FVH5

Affected Products

Github.Com/Siderolabs/Omni