CVE-2026-6540 (GCVE-0-2026-6540)

Vulnerability from cvelistv5 – Published: 2026-07-30 14:45 – Updated: 2026-07-30 16:12
VLAI
Title
L7 policy bypass via unnormalized HTTP path matching
Summary
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.
Severity
7.9 (High)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-23 - Relative Path Traversal
Assigner
References
Impacted products
Vendor Product Version
Tigera Calico Affected: 0 , < 3.31.6 (semver)
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Tigera Calico Enterprise Affected: 0 , < 3.21.7 (semver)
Affected: 3.22.0 , < 3.22.4 (semver)
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Tigera Calico Cloud Affected: 0 , < 22.4.0 (semver)
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Date Public
2026-07-30 16:00
Credits
Behnam Shobiri Seth Malaki Anthony Tam Matt Dupre
Show details on NVD website
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.