CVE-2026-6540
CVE-2026-6540 · L7 policy bypass via unnormalized HTTP path matching
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.9 · High · EPSS 0.5% · Fix available
- Published
- Updated
Stack: containers
Affected products and versions
calico
- Versions
- ≥ 0, < 3.31.6: Affected (semver)
Update to 3.31.6
calico enterprise
- Versions
- ≥ 0, < 3.21.7: Affected (semver)
- ≥ 3.22.0, < 3.22.4: Affected (semver)
Update to 3.21.7; Update to 3.22.4
calico cloud
- Versions
- ≥ 0, < 22.4.0: Affected (semver)
Update to 22.4.0