CVE-2026-6540

Summary

Calico's Application Layer Policy (disabled by default), which enforces HTTP rules through Dikastes, fails to perform URL path normalization. As a result, HTTP requests using path-traversal segments, encoded slashes, or repeated slashes are not correctly evaluated by Prefix path rules. Dikastes authorizes the request under the permitted prefix while the downstream workload or a fronting proxy normalizes the path and serves the restricted endpoint. An attacker with network access and no special RBAC can potentially reach HTTP endpoints the policy was intended to restrict.

Affected Software

VendorProductVersion RangeStatus
TigeraCalico0 < 3.31.6affected
TigeraCalico Enterprise0 < 3.21.7affected
TigeraCalico Enterprise3.22.0 < 3.22.4affected
TigeraCalico Cloud0 < 22.4.0affected

Weaknesses

  • CWE-22: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-23: CWE-23 Relative Path Traversal

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References