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Vulnerabilities CVE-2026-6540

CVE-2026-6540

High
Open
TLP:CLEAR

L7 policy bypass via unnormalized HTTP path matching

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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.

Details

CVSS Score
7.9
EPSS Score
0.37%

29.7th percentile

CVSS 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
Confidence
90%
Published
Jul 30, 2026
Last Modified
Jul 30, 2026
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