{"id":"GHSA-8qqm-fp2q-v734","revision":null,"records":[{"revision":"e8b5a8461cca4de8ad2f91204a6ffc65","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-65838","aliases":[],"title":"Skipper: an oversized declared-`Content-Length` body still hands OPA an empty `parsed_body`, so deny-on-presence Rego policies fail OPEN while the full payload reaches upstream","description":"Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.27.35, the opaAuthorizeRequestWithBody filter in filters/openpolicyagent/openpolicyagent.go can allow an oversized declared Content-Length request to bypass a deny-on-presence Rego policy because ExtractHttpBodyOptionally leaves OPA with an empty parsed_body while forwarding the complete request body upstream. This incomplete remediation of CVE-2026-50197 affects deployments that authorize request-body content and exceed -open-policy-agent-max-request-body-size, which defaults to 1 MB. Policy logic that does not reject input.attributes.request.http.truncated_body can therefore fail open and permit a forbidden payload to reach the protected service, while small bodies and the previously fixed chunked-body case are evaluated normally. This issue is fixed in version 0.27.35.","state":0,"publishedAt":"2026-09-14T20:01:27.862+00:00","modifiedAt":"2026-09-15T13:55:41.273+00:00","affected":[{"ecosystem":"Vendor product","name":"skipper","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"zalando\",\n                    \"product\": \"skipper\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.27.35\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734","https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507","https://github.com/zalando/skipper/releases/tag/v0.27.35"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-65838","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-65838","identifiers":["CVE-2026-65838"]},"retained":false,"historicalAffected":[]},{"revision":"1f2e88dc7b6d489bade883121450d765","observedAt":"2026-11-11T15:08:22.327+00:00","statement":{"source":"euvd","id":"EUVD-2026-78059","aliases":["CVE-2026-65838"],"title":"Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.27.35, the opaAuthorizeRequestWithBody filter in filters/openpolicyagent/openpolicyagent.go can allow an oversized declared Content-Length request to bypass a d…","description":"Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.27.35, the opaAuthorizeRequestWithBody filter in filters/openpolicyagent/openpolicyagent.go can allow an oversized declared Content-Length request to bypass a deny-on-presence Rego policy because ExtractHttpBodyOptionally leaves OPA with an empty parsed_body while forwarding the complete request body upstream. This incomplete remediation of CVE-2026-50197 affects deployments that authorize request-body content and exceed -open-policy-agent-max-request-body-size, which defaults to 1 MB. Policy logic that does not reject input.attributes.request.http.truncated_body can therefore fail open and permit a forbidden payload to reach the protected service, while small bodies and the previously fixed chunked-body case are evaluated normally. This issue is fixed in version 0.27.35.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":null}],"references":["https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734","https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507","https://github.com/zalando/skipper/releases/tag/v0.27.35"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78059","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 14, 2026, 8:01:27 PM","dateUpdated":"Sep 15, 2026, 1:55:41 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-78059","identifiers":["EUVD-2026-78059","CVE-2026-65838"]},"retained":false,"historicalAffected":[]},{"revision":"33965cc9bfdb44c2a7bb59060d3824d2","observedAt":"2026-10-25T15:18:45.851+00:00","statement":{"source":"nvd","id":"CVE-2026-65838","aliases":[],"title":"Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.27.35, the opaAuthorizeRequestWithBody filter in filters/openpolicyagent/openpolicyagent.go can allow an oversized declared Content-Length request to bypass a d…","description":"Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.27.35, the opaAuthorizeRequestWithBody filter in filters/openpolicyagent/openpolicyagent.go can allow an oversized declared Content-Length request to bypass a deny-on-presence Rego policy because ExtractHttpBodyOptionally leaves OPA with an empty parsed_body while forwarding the complete request body upstream. This incomplete remediation of CVE-2026-50197 affects deployments that authorize request-body content and exceed -open-policy-agent-max-request-body-size, which defaults to 1 MB. Policy logic that does not reject input.attributes.request.http.truncated_body can therefore fail open and permit a forbidden payload to reach the protected service, while small bodies and the previously fixed chunked-body case are evaluated normally. This issue is fixed in version 0.27.35.","state":0,"publishedAt":"2026-09-14T20:16:49.103+00:00","modifiedAt":"2026-09-16T13:42:48.383+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":8.2,"severity":"HIGH"}],"references":["https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507","https://github.com/zalando/skipper/releases/tag/v0.27.35","https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-65838","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-754"],"productCriteria":[],"sourceDates":{"published":"2026-09-14T20:16:49.103","lastModified":"2026-09-16T13:42:48.383"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-65838","identifiers":["CVE-2026-65838"]},"retained":false,"historicalAffected":[]},{"revision":"a78c93cc80b241bab0e395eb684261a5","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-8qqm-fp2q-v734","aliases":["CVE-2026-65838","GO-2026-6019"],"title":"Skipper: Incomplete fix for CVE-2026-50197: an oversized body can bypass OPA deny-on-presence Rego policies","description":"### Summary\n\nA wrong policy can be an open door. \nYou have to check `input.attributes.request.http.truncated_body` in your policy.\n\n### Description\n\nIncomplete fix for CVE-2026-50197: an oversized declared-`Content-Length` body still hands OPA an empty `parsed_body`, so deny-on-presence Rego policies fail OPEN while the full payload reaches upstream.\n\nThe CVE-2026-50197 fix (commit `3152f3b0`, PR #4041, v0.26.10) substituted `expectedSize = maxBodyBytes`\nonly when `req.ContentLength < 0` (chunked / HTTP/2 without content-length). But when a request declares a\n`Content-Length` larger than `maxBodyBytes`, `expectedSize > maxBodyBytes`, the body-extraction `if` is\nskipped entirely, and `ExtractHttpBodyOptionally` returns `rawBodyBytes = nil` — so OPA evaluates an empty\n`parsed_body`, while the full forbidden payload still flows to the upstream. A deny-on-presence policy\n(`default allow = true; allow = false if input.parsed_body.<forbidden>`) — the exact Rego shape the\nadvisory describes — fails OPEN. The fix's own comment reasons only about `ContentLength == -1`; the\noversized branch was never considered, and the added PoC test only covers small bodies.\n\n### Affected code\n\n- `filters/openpolicyagent/openpolicyagent.go` `ExtractHttpBodyOptionally`: the\n  `expectedSize <= maxBodyBytes` gate lets an oversized declared body fall through to\n  `return req.Body, nil, func() {}, nil` (OPA sees an empty document).\n- Corroborated by Skipper's own unit test \"Read body exhausting max bytes\" (`{ \"welcome\": \"world\" }`,\n  `maxBodySize: 5` → `bodyInPolicy: \"\"`).\n\n### Steps to reproduce\n\nSee attached `docker-compose.yml` (official `golang` image) + `setup.sh` + `exploit.sh`, which run a real\nSkipper proxy (`proxytest`) with a real OPA control plane (`opasdktest`),\n`WithMaxRequestBodyBytes(32)`, policy `allow = false if input.parsed_body.action == \"delete\"`, route\n`* -> opaAuthorizeRequestWithBody(\"test\") -> upstream`:\n- `{\"action\":\"delete\"}` (19B ≤ 32) → **403** (denied).\n- `{\"action\":\"delete\",\"pad\":\"X..64\"}` (> 32) → **200**, upstream received the full body (BYPASS).\n- small chunked `{\"action\":\"delete\"}` → **403** (positive control: the original CVE is fixed).\n\n(Library-tier: validated via Skipper's real proxy test harness, not a deploy of the official image; benign\noracle = status diff + upstream-received body; no RCE.)\n\n### Impact\n\nDeployments authorizing on request-body content via `opaAuthorizeRequestWithBody` + deny-on-presence Rego\ncan be bypassed by inflating the request body past `-open-policy-agent-max-request-body-size` (default\n1 MB); the full payload still reaches the upstream.\n\n### Mitigation\n\nDocument how policy owners should block requests with oversized body.\n\nExample deny by default and use \"allow if\" no oversized body:\n```rego\ndefault allow := false\n\nallow if {\n    input.attributes.request.http.truncated_body == false\n    # ... body-based conditions\n}\n```\n\nExample allow by default and use \"deny if\" an oversized body:\n```rego\ndefault deny := false\n\ndeny if {\n    input.attributes.request.http.truncated_body == true\n    # ... body-based conditions\n}\n```\n\nDocumentation is published by https://github.com/zalando/skipper/releases/tag/v0.27.26\n\n### Credit\n\nReported as part of an incomplete-patch measurement study (responsible disclosure).","state":0,"publishedAt":"2026-07-17T21:49:48+00:00","modifiedAt":"2026-09-25T17:15:05.9482442+00:00","affected":[{"ecosystem":"Go","name":"github.com/zalando/skipper","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.27.26"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734","https://nvd.nist.gov/vuln/detail/CVE-2026-65838","https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507","https://github.com/zalando/skipper","https://github.com/zalando/skipper/releases/tag/v0.27.26","https://github.com/zalando/skipper/releases/tag/v0.27.35"],"sourceUrl":"https://github.com/advisories/GHSA-8qqm-fp2q-v734","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-8qqm-fp2q-v734","identifiers":["GHSA-8qqm-fp2q-v734","CVE-2026-65838","GO-2026-6019"]},"retained":false,"historicalAffected":[]},{"revision":"34c195147d2e4b0eb0502efd88b60e37","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6019","aliases":["CVE-2026-65838","GHSA-8qqm-fp2q-v734"],"title":"Skipper: Incomplete fix for CVE-2026-50197: an oversized body can bypass OPA deny-on-presence Rego policies in github.com/zalando/skipper","description":"Skipper: Incomplete fix for CVE-2026-50197: an oversized body can bypass OPA deny-on-presence Rego policies in github.com/zalando/skipper","state":0,"publishedAt":"2026-07-22T20:36:35+00:00","modifiedAt":"2026-09-15T11:55:56.9993834+00:00","affected":[{"ecosystem":"Go","name":"github.com/zalando/skipper","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.27.26"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734","https://github.com/zalando/skipper/releases/tag/v0.27.26"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6019","license":"OSV · upstream source license applies","key":"osv:GO-2026-6019","identifiers":["GO-2026-6019","CVE-2026-65838","GHSA-8qqm-fp2q-v734"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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