CVE-2026-6540
L7 policy bypass via unnormalized HTTP path matching
- Published
- Updated
- Reserved
- Assigned by
- Tigera
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| TigeraCNA (assigner) | 4.0 | High7.9 | 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 |
| NVDNVD · Analyzed | 4.0 | High7.9 | 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 (exploitation in 30 days)
- 0.54% · top 54% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.9.
Weakness
Affected products
- affected < 3.31.6
- affected < 3.21.7
- affected 3.22.0 – < 3.22.4
- affected < 22.4.0
References (4)
- https://github.com/projectcalico/calico/pull/12531 (opens in a new tab)patch
- https://github.com/projectcalico/calico/pull/12532 (opens in a new tab)patch
- https://github.com/projectcalico/calico/pull/12533 (opens in a new tab)patch
- https://www.tigera.io/security-bulletins/tta-2026-005/ (opens in a new tab)vendor-advisory
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-6540)Record last updated .