# CVE-2026-65838

## Summary

- **CVE ID:** CVE-2026-65838
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N)
- **CWE:** CWE-754
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- zalando — skipper (< 0.27.35)

## References

- [CNA](https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734)
- [CNA](https://github.com/zalando/skipper/commit/2cfceabaa6ff0af65b312dcb9bcbe84691b9d507)
- [CNA](https://github.com/zalando/skipper/releases/tag/v0.27.35)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 18.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._