Vulnerability · Published Jul 30, 2026 · Assigned by Tigera
CVE-2026-6540L7 policy bypass via unnormalized HTTP path matching
High 7.9
In plain English
A high-severity path traversal in Calico from Tigera. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Tigera | Calico | 0 – before 3.31.6 |
| Tigera | Calico Enterprise | 0 – before 3.21.73.22.0 – before 3.22.4 |
| Tigera | Calico Cloud | 0 – before 22.4.0 |
Weakness: CWE-22, CWE-23 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:L