{"id":"CVE-2026-65838","published":"2026-09-14T20:01:27Z","modified":"2026-09-15T13:55:41Z","title":"Skipper: an oversized declared-`Content-Length` body still hands OPA an empty `parsed_body`, so deny-on-presence Rego…","vendor":"zalando","product":"skipper","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":8.2,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00464,"percentile":0.40097,"provenance":"source"},"cwes":[{"id":"CWE-754","name":"Improper Check for Unusual or Exceptional Conditions"}],"references":[{"url":"https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507","tags":["x_refsource_MISC"]},{"url":"https://github.com/zalando/skipper/releases/tag/v0.27.35","tags":["x_refsource_MISC"]}],"priority":{"score":13.8,"factors":[{"name":"EPSS percentile","points":8.02},{"name":"CVSS severity","points":5.74}]},"vendorSlug":"zalando","affectedVersions":[{"vendor":"zalando","product":"skipper","versions":["< 0.27.35"]}],"affected":[{"ecosystem":"Go","package":"github.com/zalando/skipper","vulnerableRanges":["<0.27.26"],"patched":["0.27.26"],"from":["GHSA-8qqm-fp2q-v734","GO-2026-6019"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-78059","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-zalando-skipper-cve-2026-50197","parents":[{"from":"CVE-2026-50197","to":"CVE-2026-65838","relation":"incomplete-fix","confidence":"high","kind":"lineage","evidence":[{"kind":"text","provenance":"source","relation":"incomplete-fix","quote":"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.","from":"CVE.org","in":"CVE-2026-65838"}]}],"packageHistory":[{"cve":"CVE-2026-50197","published":"2026-07-17","fixed":"0.26.10","kev":false},{"cve":"CVE-2026-54247","published":"2026-09-14","fixed":"0.26.22","kev":false},{"cve":"CVE-2026-54246","published":"2026-09-14","fixed":"0.27.13","kev":false,"link":{"from":"CVE-2026-54246","to":"CVE-2026-65838","relation":"successor","confidence":"low","kind":"sequence","orderedBy":"description","evidence":[{"kind":"version-step","provenance":"source","package":"Go:github.com/zalando/skipper","fromFixed":"0.27.13","toFixed":"0.27.26","daysApart":0}]}},{"cve":"CVE-2026-65838","published":"2026-09-14","fixed":"0.27.26","kev":false},{"cve":"CVE-2026-86043","published":"2026-09-16","fixed":"0.27.37","kev":false,"link":{"from":"CVE-2026-65838","to":"CVE-2026-86043","relation":"successor","confidence":"medium","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Go:github.com/zalando/skipper","fromFixed":"0.27.26","toFixed":"0.27.37","daysApart":2},{"kind":"similar","provenance":"machine","score":0.48,"basis":"same product + description similarity"}]}}],"package":"Go:github.com/zalando/skipper"}}