{"id":"CVE-2026-6540","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-6540","generatedAt":"2026-10-28T02:55:28.747Z","title":"As a result, HTTP requests using path-traversal segments, encoded slashes, or repeated slashes are not correctly evaluated by Prefix path rules.","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.","published":"2026-07-30T15:16:38.000Z","lastModified":"2026-08-08T01:10:44.000Z","status":"Analyzed","sourceIdentifier":"psirt@tigera.io","cvss":{"version":"4.0","score":7.9,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-22","CWE-23"],"affected":["tigera/calico"],"epss":{"score":0.00539,"percentile":0.45106,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.54%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/projectcalico/calico/pull/12531","tags":["Issue Tracking","Patch"],"source":"psirt@tigera.io"},{"url":"https://github.com/projectcalico/calico/pull/12532","tags":["Issue Tracking","Patch"],"source":"psirt@tigera.io"},{"url":"https://github.com/projectcalico/calico/pull/12533","tags":["Issue Tracking","Patch"],"source":"psirt@tigera.io"},{"url":"https://www.tigera.io/security-bulletins/tta-2026-005/","tags":["Vendor Advisory"],"source":"psirt@tigera.io"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-6540","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}