CVE-2026-6540

L7 policy bypass via unnormalized HTTP path matching

Published Jul 30, 2026 CVSS 4.0 · 7.9 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Tigera
Tigera calico
Tigera calico Cloud
Tigera calico Enterprise
Vendors & Products Tigera
Tigera calico
Tigera calico Cloud
Tigera calico Enterprise
Type Values Removed Values Added
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.
Title L7 policy bypass via unnormalized HTTP path matching
Weaknesses CWE-22
CWE-23
References
Metrics cvssV4_0

{'score': 7.9, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Tigera
Published
Updated
Jul 30, 2026, 4:12 PM
Reserved
Apr 17, 2026, 5:41 PM
Status
Analyzed
Published
Jul 30, 2026, 3:16 PM
Modified
Aug 8, 2026, 1:10 AM