Vulnerability Description
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.NewDecoder(io.TeeReader(r.Body, &bodyBuffer)) under an http.HandlerFunc without an http.MaxBytesReader or equivalent body-size limit. A pod-network client can send one oversized POST to an admission webhook, causing the decoder and bodyBuffer to retain amplified copies of the request until the controller pod exhausts memory and is OOM-killed. Every downstream consumer using the shared webhook server inherits the vulnerable behavior, including Knative, Tekton, KEDA, Sigstore policy-controller, and Kpack. For consumers configured with failurePolicy=Fail, loss of the controller can interrupt admission; with failurePolicy=Ignore, the affected webhook is unavailable while other admissions continue. This issue is fixed in version 0.0.0-20260531000007-52dbd5ece63f.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/knative/pkg/commit/52dbd5ece63fe6d2d340ecbebec160550f460818
- https://github.com/knative/pkg/pull/3363
- https://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj
FAQ
What is CVE-2026-54462?
CVE-2026-54462 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 att...
How severe is CVE-2026-54462?
CVE-2026-54462 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54462?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.