{"cve":"CVE-2026-86043","nvd":{"published":"2026-09-16T19:17:51.993","modified":"2026-09-16T20:17:36.343","status":"Deferred","description":"Skipper is an HTTP router and reverse proxy for service composition. Prior to version 0.27.37, the opaAuthorizeRequestWithBody filter can authorize an oversized request after Skipper truncates the body presented to Open Policy Agent because the input.truncated_body signal is derived from Content-Length rather than the actual read result. In filters/openpolicyagent/openpolicyagent.go, ExtractHttpBodyOptionally truncates bodies at maxBodyBytes, while filters/openpolicyagent/internal/envoy/skipperadapter.go copies the request headers without adding a Content-Length value that reflects the truncation. For an HTTP/1.1 request using Transfer-Encoding: chunked or an HTTP/2 request without Content-Length, a body-inspecting policy that follows the prior mitigation and permits input.truncated_body equal to false can evaluate only the truncated prefix, allow the request, and then forward the full oversized body to the protected upstream. This residual issue is distinct from CVE-2026-50197. This issue is fixed in version 0.27.37.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-863"],"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-5gpm-rgj3-9q76","https://github.com/zalando/skipper/tree/v0.27.35","https://github.com/zalando/skipper/security/advisories/GHSA-5gpm-rgj3-9q76"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:54:41.405518556+00:00"},"epss":{"cve":"CVE-2026-86043","score":0.00451,"percentile":0.39204,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-5gpm-rgj3-9q76","url":"https://osv.dev/vulnerability/GHSA-5gpm-rgj3-9q76","summary":"Skipper has OPA body-authz bypass: truncated_body mitigation fails open on chunked/HTTP-2 (incomplete fix GHSA-8qqm-fp2q-v734)","modified":"2026-09-28T17:11:13.345846346Z","packages":[{"ecosystem":"Go","name":"github.com/zalando/skipper","purl":"pkg:golang/github.com/zalando/skipper","ranges":["<0.27.37"],"fixed":["0.27.37"]}]},{"id":"GO-2026-6495","url":"https://osv.dev/vulnerability/GO-2026-6495","summary":"Skipper has OPA body-authz bypass: truncated_body mitigation fails open on chunked/HTTP-2 (incomplete fix GHSA-8qqm-fp2q-v734) in github.com/zalando/skipper","modified":"2026-09-28T17:00:16.898508262Z","packages":[{"ecosystem":"Go","name":"github.com/zalando/skipper","purl":"pkg:golang/github.com/zalando/skipper","ranges":["<0.27.37"],"fixed":["0.27.37"]}]}],"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."]}