knative.dev/pkg admission webhooks allow unbounded request-body memory exhaustion

⚠️ Update verification, 2026-05-19: C-2 confirmed end-to-end — 4.5× amplification observed worse than the advisory's conservative 2× claim Built a Go PoC cmd/poc-c2/main.go that runs the exact 8-line vulnerable snippet from webhook/admission.go:109-117 verbatim under the same http.HandlerFunc shap...

CVE-2026-54462 knative.dev/pkg admission webhooks allow unbounded request-body memory exhaustion

Knative pkg provides common packages shared across Knative repositories. Prior to 0.0.0-20260531000007-52dbd5ece63f, the knative.dev/pkg/webhook admissionHandler in webhook/admission.go decodes an attacker-supplied AdmissionReview through json.NewDecoderio.TeeReaderr.Body, &bodyBuffer under an...

CVE-2026-54462

The knative.dev/pkg shared library is vulnerable to a memory exhaustion attack in its admission webhook handler (located in webhook/admission.go). Because the json.NewDecoder uses an io.TeeReader without an http.MaxBytesReader or equivalent body-size limit, a pod-network client can send an oversi...

CVE-2026-54462 knative.dev/pkg admission webhooks allow unbounded request-body memory exhaustion

Knative pkg provides common packages shared across Knative repositories. Prior to 0.0.0-20260531000007-52dbd5ece63f, the knative.dev/pkg/webhook admissionHandler in webhook/admission.go decodes an attacker-supplied AdmissionReview through json.NewDecoderio.TeeReaderr.Body, &bodyBuffer under an...