CVE-2026-54462 knative.dev/pkg admission webhooks allow unbounded request-body memory exhaustion
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-54462?
CVE-2026-54462 is a medium-severity vulnerability in knative pkg, published on 27 Oct 2026.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-54462?
2 open source packages ship an affected version, including knative.dev/pkg.
| Package | Affected | Fixed in |
|---|---|---|
knative.dev/pkg Go | All versions | 0.0.0-20260531000007-52dbd5ece63f |
knative.dev/pkg Go | All versions | 0.0.0-20260531000007-52dbd5ece63f |
How do I fix CVE-2026-54462?
Upgrade knative.dev/pkg to 0.0.0-20260531000007-52dbd5ece63f or later.
Is CVE-2026-54462 being exploited?
There is no known exploitation of CVE-2026-54462 in the wild and no public exploit code.
Sources
Also known as ECHO-b911-ff02-ef59, GHSA-2hw4-c9m4-f2fj, GHSA-j8gc-gxpv-w8rg.