{"items":[{"id":"NVI-00016023","kind":"vulnerability","title":"Skipper: Unbounded Request Body Read in Admission Webhook Causes Memory Exhaustion DoS","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-cwxq-rc9x-2jvv","CVE-2026-54247"],"plain_summary":"GitHub lists this reviewed advisory for github.com/zalando/skipper. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-02c8d8fa277fb4bb78fcaf3e18d107c3"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-17T18:14:10.000Z","value":"4.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-0748a75bd7422f889fff9a1845b1f228"},{"kind":"CVSS","as_of":"2026-09-16T17:17:20.600Z","value":"4.3 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-02c8d8fa277fb4bb78fcaf3e18d107c3"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0748a75bd7422f889fff9a1845b1f228","url":"https://github.com/advisories/GHSA-cwxq-rc9x-2jvv","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cwxq-rc9x-2jvv","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T09:59:26.779Z"},{"id":"sr-02c8d8fa277fb4bb78fcaf3e18d107c3","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54247","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-54247","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T01:48:12.360Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0748a75bd7422f889fff9a1845b1f228"],"technology":"github.com/zalando/skipper","known_exclusions":[],"conditions_summary":"## Summary\n\nThe Kubernetes admission webhook handler reads the entire request body using `io.ReadAll(r.Body)` without any size limit. Any client that can reach the webhook port within the cluster can send a multi-GB payload, causing the skipper process to exhaust memory and be OOM-killed. This disrupts all Kubernetes admission control, potentially blocking all pod creation and updates.\n\n## Vulnerable Code\n\n```go\n// dataclients/kubernetes/admission/admission.go:76\nbody, err := io.ReadAll(r.Body)  // <-- NO SIZE LIMIT\nif err != nil {\n    log.Errorf(\"Failed to read request: %v\", err)\n    w.WriteHeader(http.StatusInternalServerError)\n    invalidRequests.WithLabelValues(admitterName).Inc()\n    return\n}\n\nvar review admissionReview\nerr = json.Unmarshal(body, &review)\n```\n\nFor comparison, the OPA filter has a body size limit:\n\n```go\n// filters/openpolicyagent/openpolicyagent.go:68-70\nconst DefaultMaxRequestBodySize = 1 << 20 // 1MB\n\n// OPA uses a bufferedBodyReader with size limits\n```\n\n## Attack Path\n\n1. Attacker identifies the admission webhook endpoint (default: `:9443/admission` or configured path)\n2. Attacker sends: `POST /admission HTTP/1.1, Content-Type: application/json` with a mul","public_affected_ranges":["< 0.26.22"]}],"null_published_at":"2026-11-08T19:53:44.016Z","source_updated_at":"2026-07-17T18:14:10.000Z","source_disclosed_at":"2026-07-17T18:14:08.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-04T09:59:26.779Z"},{"id":"NVI-00016023","kind":"vulnerability","title":"Skipper: Unbounded Request Body Read in Admission Webhook Causes Memory Exhaustion DoS","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cwxq-rc9x-2jvv","CVE-2026-54247"],"plain_summary":"GitHub lists this reviewed advisory for github.com/zalando/skipper. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0748a75bd7422f889fff9a1845b1f228"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-07-17T18:14:10.000Z","value":"4.3 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-0748a75bd7422f889fff9a1845b1f228"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-0748a75bd7422f889fff9a1845b1f228","url":"https://github.com/advisories/GHSA-cwxq-rc9x-2jvv","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cwxq-rc9x-2jvv","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T09:59:26.779Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0748a75bd7422f889fff9a1845b1f228"],"technology":"github.com/zalando/skipper","known_exclusions":[],"conditions_summary":"## Summary\n\nThe Kubernetes admission webhook handler reads the entire request body using `io.ReadAll(r.Body)` without any size limit. Any client that can reach the webhook port within the cluster can send a multi-GB payload, causing the skipper process to exhaust memory and be OOM-killed. This disrupts all Kubernetes admission control, potentially blocking all pod creation and updates.\n\n## Vulnerable Code\n\n```go\n// dataclients/kubernetes/admission/admission.go:76\nbody, err := io.ReadAll(r.Body)  // <-- NO SIZE LIMIT\nif err != nil {\n    log.Errorf(\"Failed to read request: %v\", err)\n    w.WriteHeader(http.StatusInternalServerError)\n    invalidRequests.WithLabelValues(admitterName).Inc()\n    return\n}\n\nvar review admissionReview\nerr = json.Unmarshal(body, &review)\n```\n\nFor comparison, the OPA filter has a body size limit:\n\n```go\n// filters/openpolicyagent/openpolicyagent.go:68-70\nconst DefaultMaxRequestBodySize = 1 << 20 // 1MB\n\n// OPA uses a bufferedBodyReader with size limits\n```\n\n## Attack Path\n\n1. Attacker identifies the admission webhook endpoint (default: `:9443/admission` or configured path)\n2. Attacker sends: `POST /admission HTTP/1.1, Content-Type: application/json` with a mul","public_affected_ranges":["< 0.26.22"]}],"null_published_at":"2026-11-04T10:04:27.866Z","source_updated_at":"2026-07-17T18:14:10.000Z","source_disclosed_at":"2026-07-17T18:14:08.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-04T09:59:26.779Z"}],"next_cursor":null,"snapshot_revision":"42594"}