{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6540","assignerOrgId":"e6d453f4-3dae-4941-bcea-9af25f4e824d","state":"PUBLISHED","assignerShortName":"Tigera","dateReserved":"2026-04-17T17:41:32.750Z","datePublished":"2026-07-30T14:45:04.068Z","dateUpdated":"2026-07-30T16:12:07.691Z"},"containers":{"cna":{"providerMetadata":{"orgId":"e6d453f4-3dae-4941-bcea-9af25f4e824d","shortName":"Tigera","dateUpdated":"2026-07-30T14:45:04.068Z"},"title":"L7 policy bypass via unnormalized HTTP path matching","datePublic":"2026-07-30T16:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-22","description":"CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]},{"descriptions":[{"lang":"en","cweId":"CWE-23","description":"CWE-23 Relative Path Traversal","type":"CWE"}]}],"affected":[{"vendor":"Tigera","product":"Calico","versions":[{"status":"affected","version":"0","lessThan":"3.31.6","versionType":"semver"}],"defaultStatus":"unaffected"},{"vendor":"Tigera","product":"Calico Enterprise","versions":[{"status":"affected","version":"0","lessThan":"3.21.7","versionType":"semver"},{"status":"affected","version":"3.22.0","lessThan":"3.22.4","versionType":"semver"}],"defaultStatus":"unaffected"},{"vendor":"Tigera","product":"Calico Cloud","versions":[{"status":"affected","version":"0","lessThan":"22.4.0","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>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.</p>"}]}],"references":[{"url":"https://github.com/projectcalico/calico/pull/12531","tags":["patch"]},{"url":"https://github.com/projectcalico/calico/pull/12532","tags":["patch"]},{"url":"https://github.com/projectcalico/calico/pull/12533","tags":["patch"]},{"url":"https://www.tigera.io/security-bulletins/tta-2026-005/","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","subIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subAvailabilityImpact":"LOW","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.9,"vectorString":"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"}}],"credits":[{"lang":"en","value":"Behnam Shobiri","type":"finder"},{"lang":"en","value":"Seth Malaki","type":"remediation developer"},{"lang":"en","value":"Anthony Tam","type":"remediation reviewer"},{"lang":"en","value":"Matt Dupre","type":"remediation reviewer"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-30T16:12:00.537090Z","id":"CVE-2026-6540","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-30T16:12:07.691Z"}}]}}