High [CVE-2026-84196] Server-Side Request Forgery via apiCall.service.url allows information disclosure.
This high-severity Red Hat Linux advisory covers CVE-2026-84196.
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Summary
A flaw was found in Kyverno. This server-side request forgery (SSRF) vulnerability in apiCall.service.url allows authenticated users to send arbitrary HTTP requests.
By injecting user-controlled input through variable substitution, attackers can target internal services, cloud metadata endpoints, and loopback addresses. The response data is reflected in admission error messages, enabling non-blind data exfiltration, which means sensitive information can be disclosed.
This allows attackers to make arbitrary HTTP requests to internal services, cloud metadata endpoints, and loopback addresses, leading to information disclosure through admission error messages. Red Hat severity: Important — CVSS 7.7 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).
Weakness: CWE-918.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Ensure that no policy interpolates request-controlled data into apiCall.service.url. Audit all Policy, ClusterPolicy, and GlobalContextEntry resources for {{ }} expressions in that field and replace them with static URLs. Where a dynamic value is genuinely required, move it into the request body or a header rather than the URL, or constrain it to a fixed allowlist of permitted values before substitution. Enforce this going forward with a ValidatingAdmissionPolicy that rejects policies containing variable substitution in apiCall.service.url.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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