Vulnerability 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d5
- https://github.com/zalando/skipper/releases/tag/v0.27.35
- https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734
FAQ
What is CVE-2026-65838?
CVE-2026-65838 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 decla...
How severe is CVE-2026-65838?
CVE-2026-65838 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-65838?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.