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TI-2026-40393 Aliases CVE-2026-55998

Cluster Existence Oracle via Unauthenticated Import Endpoint

Priority LOW 30CWE-204Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-204.

Summary

The endpoint /v3/import/{token}_{clusterId}.yaml retrieves the cluster object before validating the token. When a valid cluster ID references a cluster that has private registry secrets configured, a nil pointer dereference in pkg/systemtemplate/private_registry.go causes the request to return HTTP 502 Bad Gateway. For cluster IDs that do not exist, the endpoint returns HTTP 200. This observable difference in response codes constitutes a reliable enumeration oracle.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00343 27th percentileScored 2026-11-07
Fix Fixed Rancher (SUSE): 2.14.4, 2.13.8, 2.12.12 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
SUSERancher2.14.0 to before 2.14.4; 2.13.0 to before 2.13.8; 2.12.0 to before 2.12.12; 2.11.0 to before 2.11.162.14.4, 2.13.8, 2.12.12, 2.11.16Patch availableCNA
  • Rancher VendorSUSE Affected 2.14.0 to before 2.14.4; 2.13.0 to before 2.13.8; 2.12.0 to before 2.12.12; 2.11.0 to before 2.11.16 Fixed in 2.14.4, 2.13.8, 2.12.12, 2.11.16 Patch available CNA

Remediation

  • Fix · CNA Rancher (SUSE) Fixed in 2.14.4, 2.13.8, 2.12.12, 2.11.16

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    SUSE Rancher 2.11.16, 2.12.12 and 2 more versions

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-40391 Unauthenticated Denial-of-Service via TLS SAN Stuffing in Rancher and cattle-cluster-agentPriority LOW 20
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55998

References

Other 2

  • TI-2016-03560 Unspecified vulnerability in Adobe Flash Player 21.0.0.242 and earlier allows remote… KEVCVSS 3.1CRITICAL 9.8
  • TI-2016-03506 Adobe Flash Player 21.0.0.226 and earlier allows remote attackers to execute arbitrary… KEVCVSS 3.1CRITICAL 9.8
  • TI-2016-02888 Unspecified vulnerability in Oracle Java SE 6u113, 7u99, and 8u77; Java SE Embedded 8u77… KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-04302 Use-after-free vulnerability in the BitmapData class in the ActionScript 3 (AS3)… KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-04301 Use-after-free vulnerability in the DisplayObject class in the ActionScript 3 (AS3)… KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-04298 Use-after-free vulnerability in the ByteArray class in the ActionScript 3 (AS3)… KEVCVSS 3.1CRITICAL 9.8
See all 1331 →

Sources

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