CVE-2026-6540Network attack vector

HTTP policy bypass via raw path comparison

Published Jul 30, 2026 · Updated Jul 30, 2026

Path traversal in Tigera Calico, Calico Enterprise, and Calico Cloud allows remote attackers to reach restricted HTTP endpoints. Dikastes matchHTTPPaths compares the raw request target byte-for-byte with Prefix rules before a workload or proxy normalizes encoded separators, dot segments, or repeated slashes. Network reachability and enabled Application Layer Policy with Prefix rules are required; no Calico RBAC privileges are needed.

CVSS severity7.9
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Tigera Calico, Calico Enterprise, and Calico Cloud allows remote attackers to reach restricted HTTP endpoints. Dikastes matchHTTPPaths compares the raw request target byte-for-byte with Prefix rules before a workload or proxy normalizes encoded separators, dot segments, or repeated slashes. Network reachability and enabled Application Layer Policy with Prefix rules are required; no Calico RBAC privileges are needed.

The record

CVE
CVE-2026-6540
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
Tigera
Product
Calico
Classifications
CWE-23, CWE-22, T1211
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.31.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tigera · Calicoversion=0 <3.31.6
Tigera · Calico Enterpriseversion=0 <3.21.7; version=3.22.0 <3.22.4
Tigera · Calico Cloudversion=0 <22.4.0

Published CVSS scores

7.9TigeraCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1211Exploitation for Defense Evasion

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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