CVE-2026-6540

UNKNOWN 0.0

L7 policy bypass via unnormalized HTTP path matching

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22 CWE-23
Vendor	tigera
Product	calico
Published	Jul 30, 2026
Last Updated	Jul 30, 2026

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Affected Versions

Tigera / Calico

0 < 3.31.6

Tigera / Calico Enterprise

0 < 3.21.7 3.22.0 < 3.22.4

Tigera / Calico Cloud

0 < 22.4.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/projectcalico/calico/pull/12531 github.com: https://github.com/projectcalico/calico/pull/12532 github.com: https://github.com/projectcalico/calico/pull/12533 tigera.io: https://www.tigera.io/security-bulletins/tta-2026-005/

Credits

Behnam Shobiri Seth Malaki Anthony Tam Matt Dupre