CVE-2026-54462

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{"affected": [{"affectedData": [{"product": "pkg", "vendor": "knative", "versions": [{"status": "affected", "version": "< 0.0.0-20260531000007-52dbd5ece63f"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-54462", "lastModified": "2026-11-02T20:17:43.803", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54462", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-02T19:28:33.067745Z", "version": "2.0.3"}}]}, "published": "2026-10-27T17:17:01.110", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/knative/pkg/commit/52dbd5ece63fe6d2d340ecbebec160550f460818"}, {"source": "security-advisories@github.com", "url": "https://github.com/knative/pkg/pull/3363"}, {"source": "security-advisories@github.com", "url": "https://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "knative.dev/pkg: knative.dev/pkg: Denial of Service via oversized request body", "id": "2562245", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2562245"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["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.", "A flaw was found in knative.dev/pkg. The admission webhook handler does not enforce size restrictions on incoming HTTP request bodies. A network client can exploit this vulnerability by submitting an oversized request, causing the controller process to exhaust memory and crash. This results in a Denial of Service (DoS) that can disrupt admission review operations across dependent services."], "name": "CVE-2026-54462", "package_state": [{"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-controller-rhel10", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-controller-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-git-cloner-rhel10", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-git-cloner-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix 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"package_name": "openshift-builds/openshift-builds-rhel9-operator", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-waiters-rhel10", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-waiters-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-webhook-rhel10", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-webhook-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2", "fix_state": "Fix deferred", "package_name": 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"2026-10-27T16:12:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54462\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54462\nhttps://github.com/knative/pkg/commit/52dbd5ece63fe6d2d340ecbebec160550f460818\nhttps://github.com/knative/pkg/pull/3363\nhttps://github.com/knative/pkg/security/advisories/GHSA-2hw4-c9m4-f2fj"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.0.0-20260531000007-52dbd5ece63f)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "pkg", "source": "cna", "vendor": "knative"}, "product": "pkg", "vendor": "knative"}], "created": "2026-10-27T17:45:06.457574+00:00", "updated": "2026-10-28T22:12:36.706068+00:00", "vendors": ["knative", "knative$PRODUCT$pkg"]}