CVE-2026-6540Disclosure(tigera / calico)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

tigera CVEs Back to dashboard

0.0/ 10 priority

Sources & remediation

Patch / fix

Vendor / third-party advisories

https://www.tigera.io/security-bulletins/tta-2026-005/

Weakness type (CWE)

CWE-22CWE-23

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

calico

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

tigera

Products

calico

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Full discourse1 post

CyberSignal | Cybersecurity News@XQOPTRX46d
Disclosure
☸️ Calico network policy bypass disclosed CVE-2026-6540 affects Calico's optional Application Layer Policy. Improper URL normalization means crafted paths containing traversal segments, encoded slashes or repeated slashes may be authorized under an allowed prefix while reaching a restricted endpoint after normalization. 🔎 Source: Calico / Tenable. #Kubernetes #Calico #CloudSecurity #CVE #CyberSecurity
Post summary
The post announces CVE-2026-6540, detailing a URL normalization bypass in Calico’s policy enforcement, but provides no PoC, exploit, patch, or evidence of active exploitation.
0000035
34 followersView on X

CPE platform detail3 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

3 of 3 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	tigera	calico	-	-	-
App	tigera	calico	-	-	-
App	tigera	calico	-	-	-

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