{"id":"CVE-2026-65838","title":"Skipper is an HTTP router and reverse proxy for service composition","summary":"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 …","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","cwe":["CWE-754"],"vendor":"zalando","product":"skipper","affected":["skipper < 0.27.35"],"published":"2026-09-14","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:48.383","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-65838","references":[{"url":"https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507","label":"security-advisories@github.com"},{"url":"https://github.com/zalando/skipper/releases/tag/v0.27.35","label":"security-advisories@github.com"},{"url":"https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734","label":"security-advisories@github.com"},{"url":"https://github.com/zalando/skipper"},{"url":"https://github.com/zalando/skipper/releases/tag/v0.27.26"}],"tags":["nvd","cve.org","osv","go"],"epss":0.00266,"epssPercentile":0.19025,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-15T13:26:56.403629Z"},"ingestedAt":"2026-09-14T20:14:21.147Z","aliases":["GHSA-8qqm-fp2q-v734","GO-2026-6019"],"ecosystem":"go","patched":["github.com/zalando/skipper 0.27.26"],"slug":"CVE-2026-65838","body":"## Overview\n\nSkipper 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-65838)\n\nAffected packages:\n\n- `github.com/zalando/skipper < 0.27.26`\n\nPatched in:\n\n- `github.com/zalando/skipper 0.27.26`\n\nSource: https://osv.dev/vulnerability/GHSA-8qqm-fp2q-v734","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}