{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18678", "assignerOrgId": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb", "state": "PUBLISHED", "assignerShortName": "Kong", "dateReserved": "2026-08-03T15:20:46.760Z", "datePublished": "2026-08-12T18:49:45.530Z", "dateUpdated": "2026-08-13T14:47:36.551Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "02762ae7-200e-4b20-9b2b-a77d5b8fc4cb", "shortName": "Kong", "dateUpdated": "2026-08-12T18:49:45.530Z"}, "title": "Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate when no CA is configured", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-295", "description": "CWE-295 Improper Certificate Validation", "type": "CWE"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "Credential interception"}]}], "affected": [{"vendor": "Kong Inc.", "product": "Kong Mesh", "platforms": ["Linux"], "modules": ["kumactl"], "versions": [{"status": "affected", "version": "0", "lessThan": "2.7.26", "versionType": "semver"}, {"status": "affected", "version": "2.8.0", "lessThan": "2.9.16", "versionType": "semver"}, {"status": "affected", "version": "2.10.0", "lessThan": "2.11.14", "versionType": "semver"}, {"status": "affected", "version": "2.12.0", "lessThan": "2.12.11", "versionType": "semver"}, {"status": "affected", "version": "2.13.0", "lessThan": "2.13.7", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "When an operator adds an HTTPS control plane profile to kumactl without providing a CA certificate, kumactl disables TLS verification and sends API tokens over the unverified connection.\n\n\n\nAn attacker on the network path between the operator and the control plane can intercept user or admin API tokens and then act against the control plane as that user.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>When an operator adds an HTTPS control plane profile to <code>kumactl</code> without providing a CA certificate, <code>kumactl</code> disables TLS verification and sends API tokens over the unverified connection.</p><p>An attacker on the network path between the operator and the control plane can intercept user or admin API tokens and then act against the control plane as that user.</p>"}]}], "references": [{"url": "https://github.com/kumahq/kuma/security/advisories/GHSA-v95x-xhq5-4929", "name": "Upstream advisory GHSA-v95x-xhq5-4929", "tags": ["vendor-advisory"]}, {"url": "https://github.com/kumahq/kuma/pull/16777", "name": "kumahq/kuma#16777 (master)", "tags": ["patch"]}, {"url": "https://developer.konghq.com/mesh/changelog/", "name": "Kong MESH Changelog", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "ADJACENT", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.5, "vectorString": "CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H"}}], "configurations": [{"lang": "en", "value": "You are affected if you have kumactl profiles manually added against an HTTPS control plane endpoint without --ca-cert-file.\n\n\n\nYou are not affected if you use the default local profile, which uses plain HTTP.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>You are affected if you have <code>kumactl</code> profiles manually added against an HTTPS control plane endpoint without <code>--ca-cert-file</code>.</p><p>You are not affected if you use the default local profile, which uses plain HTTP.</p>"}]}], "workarounds": [{"lang": "en", "value": "When adding an HTTPS control plane profile to kumactl, always pass --ca-cert-file pointing at the control plane's serving CA. 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