{"cve":"CVE-2026-65838","nvd":{"published":"2026-09-14T20:16:49.103","modified":"2026-09-16T13:42:48.383","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-754"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-65838","score":0.00464,"percentile":0.40216,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8qqm-fp2q-v734","url":"https://osv.dev/vulnerability/GHSA-8qqm-fp2q-v734","summary":"Skipper: Incomplete fix for CVE-2026-50197: an oversized body can bypass OPA deny-on-presence Rego policies","modified":"2026-09-25T17:15:05.948244239Z","packages":[{"ecosystem":"Go","name":"github.com/zalando/skipper","purl":"pkg:golang/github.com/zalando/skipper","ranges":["<0.27.26"],"fixed":["0.27.26"]}]},{"id":"GO-2026-6019","url":"https://osv.dev/vulnerability/GO-2026-6019","summary":"Skipper: Incomplete fix for CVE-2026-50197: an oversized body can bypass OPA deny-on-presence Rego policies in github.com/zalando/skipper","modified":"2026-09-15T11:55:56.999383354Z","packages":[{"ecosystem":"Go","name":"github.com/zalando/skipper","purl":"pkg:golang/github.com/zalando/skipper","ranges":["<0.27.26"],"fixed":["0.27.26"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}