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CVE-2026-86043— Skipper: OPA body-authz bypass: truncated_body mitigation fails open on chunked/HTTP-2 (incomplete fix CVE-2026-50197)

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 0.27.37 版本之前， 过滤器可能会在 Skipper 将发送给 Open Policy Agent（OPA）的请求体被截断后，仍然授权一个超大的请求。这是因为 信号是基于 而非实际读取结果推导出来的。 具体而言，在 中， 函数会在达到 时截断请求体；而在 中，代码在复制请求头时，未添加反映该截断情况的 值。 对于使用 的 HTTP/1.1 请求，或没有 的 HTTP/2 请求，如果一个检查请求体的策略遵循了之前的缓解措施，并允许 为 ，那么

CVSS 7.5 · High EPSS 0.45% · P36

Possible ATT&CK Techniques 1 AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
zalando skipper < 0.27.37 affected
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I. Basic Information for CVE-2026-86043

Vulnerability Information
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Vulnerability Title
Skipper: OPA body-authz bypass: truncated_body mitigation fails open on chunked/HTTP-2 (incomplete fix CVE-2026-50197)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
zalando skipper < 0.27.37 -

II. Public POCs for CVE-2026-86043

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III. Intelligence Information for CVE-2026-86043

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Vendor Pages for CVE-2026-86043 (1)

Other References for CVE-2026-86043 (2)

IV. Related Vulnerabilities

Same product: skipper
Same vendor: zalando
Same weakness: CWE-863

V. Comments for CVE-2026-86043

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