L7 policy bypass via unnormalized HTTP path matching

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-6540
StatePUBLISHED
AssignerTigera
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-30 15:16:37 UTC
Updated2026-07-30 17:16:34 UTC
DescriptionCalico'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.

Risk And Classification

Primary CVSS: v4.0 7.9 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.003680000 probability, percentile 0.295260000 (date 2026-07-31)

Problem Types: CWE-22 | CWE-23 | CWE-22 CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-23 CWE-23 Relative Path Traversal

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary7.9HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:L/E:X/C...
4.0CNACVSS7.9HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
High
Sub Integrity
High
Sub Availability
Low

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tigera Calico affected 3.31.6 semver Not specified
CNA Tigera Calico Enterprise affected 3.21.7 semver Not specified
CNA Tigera Calico Enterprise affected 3.22.0 3.22.4 semver Not specified
CNA Tigera Calico Cloud affected 22.4.0 semver Not specified

References

ReferenceSourceLinkTags
www.tigera.io/security-bulletins/tta-2026-005 [email protected] www.tigera.io
github.com/projectcalico/calico/pull/12532 [email protected] github.com
github.com/projectcalico/calico/pull/12533 [email protected] github.com
github.com/projectcalico/calico/pull/12531 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Behnam Shobiri (en)

CNA: Seth Malaki (en)

CNA: Anthony Tam (en)

CNA: Matt Dupre (en)

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