CVE-2026-6540

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-07-30 15:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-08 01:10 UTC Last updatedMost recent change to the record

Details

Published

2026-07-30 15:16 UTC

Last modified

2026-08-08 01:10 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-22 · Path traversal

Record status

Analyzed

Affected

• Tigera Calico < 3.21.7
• Tigera Calico < 3.31.6
• Tigera Calico ≤ 22.4.0
• Tigera Calico < 3.22.4
• Tigera Calico < 3.32.1

Attack profile CVSS 4.0 · 7.9

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

None