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CVE-2026-65838— Skipper: an oversized declared-`Content-Length` body still hands OPA an empty `parsed_body`, so deny-on-presence Rego policies fail OPEN while the full payload reaches upstream

Quick assessment

Affected
zalando skipper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Skipper 是一个用于服务组合的 HTTP 路由器和反向代理。在 0.27.35 之前， 中的 过滤器存在一个缺陷：当请求声明的 过大时， 函数会将空解析出的 传递给 OPA，同时仍将完整的请求体转发给上游服务。这是针对 CVE-2026-50197 的不完整修复。该问题影响那些依赖请求体内容进行授权、且请求体大小超过 （默认值为 1 MB）的部署环境。因此，未明确拒绝 的策略逻辑可能会“默认放行”（fail-open），导致被禁止的负载到达受保护的服务；而较小的请求体以及之前已修复的分块（chunked）请求

CVSS 8.2 · High

Possible ATT&CK Techniques 1 AI

T1571 · Non-Standard Port
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I. Basic Information for CVE-2026-65838

Vulnerability Information
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Vulnerability Title
Skipper: an oversized declared-`Content-Length` body still hands OPA an empty `parsed_body`, so deny-on-presence Rego policies fail OPEN while the full payload reaches upstream
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zalando skipper < 0.27.35 -

II. Public POCs for CVE-2026-65838

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III. Intelligence Information for CVE-2026-65838

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Vendor Advisories for CVE-2026-65838 (1)

Vendor Pages for CVE-2026-65838 (1)

Same Patch Batch · zalando · 2026-09-14 · 3 CVEs total

CVE-2026-54246 5.7 MEDIUM Skipper routesrv-no-auth: All routesrv API Endpoints Lack Authentication
CVE-2026-54247 4.3 MEDIUM Skipper: Unbounded Request Body Read in Admission Webhook Causes Memory Exhaustion DoS

IV. Related Vulnerabilities

Same product: skipper
Same vendor: zalando
Same weakness: CWE-754

V. Comments for CVE-2026-65838

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