L7 policy bypass via unnormalized HTTP path matching
Published Jul 30, 2026
7.9
HIGHCVSS 4.0
EPSS 0.54%
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.
Affected products
-
- Version 0StatusaffectedConstraints<3.31.6
- Version
-
- Version 0StatusaffectedConstraints<22.4.0
- Version
-
- Version 0StatusaffectedConstraints<3.21.7
- Version 3.22.0StatusaffectedConstraints<3.22.4
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tigera | Calico | unaffected |
| |||||||||
| Tigera | Calico Cloud | unaffected |
| |||||||||
| Tigera | Calico Enterprise | unaffected |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
1 other source (NVD) ▾
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Jul 30, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Jul–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.54% (0.00539) | 43.34th | v5 (v2026.06.15) |
| Jul 31, 2026 | 0.37% (0.00368) | 29.53th | v5 (v2026.06.15) |
References (4)
- https://github.com/projectcalico/calico/pull/12531 patchIssue Tracking
- https://github.com/projectcalico/calico/pull/12532 patchIssue Tracking
- https://github.com/projectcalico/calico/pull/12533 patchIssue Tracking
- https://www.tigera.io/security-bulletins/tta-2026-005/ vendor-advisoryVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/projectcalico/calico/pull/12531 | patchIssue Tracking | |
| https://github.com/projectcalico/calico/pull/12532 | patchIssue Tracking | |
| https://github.com/projectcalico/calico/pull/12533 | patchIssue Tracking | |
| https://www.tigera.io/security-bulletins/tta-2026-005/ | vendor-advisoryVendor Advisory |
Change history (0)
No recorded changes yet.