Description
Kyverno before 1.18.0 contains a server-side request forgery vulnerability in apiCall.service.url that 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, with response data reflected in admission error messages enabling non-blind data exfiltration.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| kyverno | kyverno | < 1.18.0 | 1.18.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | kyverno-1.17 | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/kyverno/kyverno | <= 1.17.1 | — | GHSA-qr4g-8hrp-c4rw |
| Go | github.com/kyverno/kyverno | all versions | — | GO-2026-5594 |
References
- GitHub Security Advisory (GHSA-qr4g-8hrp-c4rw) vendor-advisory
- VulnCheck Advisory: Kyverno before 1.18.0 Server-Side Request Forgery via apiCall third-party-advisory