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TI-2026-36956 Aliases CVE-2026-50197GHSA-659f-rgp5-w4wf

Skipper: opaAuthorizeRequestWithBody filter bypasses OPA policy on Transfer-Encoding: chunked / HTTP/2 requests

Priority HIGH 73CWE-444Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Skipper is an HTTP router and reverse proxy for service composition. Prior to 0.26.10, zalando/skipper's OpenPolicyAgent integration silently bypasses request-body inspection on HTTP/1.1 Transfer-Encoding: chunked and HTTP/2 requests that omit the content-length pseudo-header, because the opaAuthorizeRequestWithBody filter and OpenPolicyAgentInstance.ExtractHttpBodyOptionally in filters/openpolicyagent/openpolicyagent.go produce an empty raw_body and input.parsed_body while the upstream service receives the full attacker-controlled body. This issue is fixed in version 0.26.10.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00513 43rd percentileScored 2026-11-07
Fix Fixed skipper (zalando): 0.26.10github.com/zalando/skipper (Go): 0.26.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
zalandoskipperbefore 0.26.100.26.10Patch availableCNA
—github.com/zalando/skipper (Go)before 0.26.100.26.10Patch availableGHSA-659f-rgp5-w4wf
  • skipper Vendorzalando Affected before 0.26.10 Fixed in 0.26.10 Patch available CNA
  • github.com/zalando/skipper (Go) Vendor— Affected before 0.26.10 Fixed in 0.26.10 Patch available GHSA-659f-rgp5-w4wf

Remediation

  • Fix · CNA skipper (zalando) Fixed in 0.26.10
  • Fix · GHSA-659f-rgp5-w4wf github.com/zalando/skipper (Go) Fixed in 0.26.10 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-50197
  2. 2026-10-03 Alias added: GHSA-659f-rgp5-w4wf

References

Other 5

  • TI-2026-46767 Skipper Incomplete Fix for CVE-2026-50197 Policy Bypass CVSS 4.0HIGH 8.8
  • TI-2026-58867 Skipper: OPA body-authz bypass: truncated_body mitigation fails open on chunked/HTTP-2 (incomplete fix CVE-2026-50197) CVSS 3.1HIGH 7.5
  • TI-2022-18154 Zalando Skipper v0.13.236 is vulnerable to Server-Side Request Forgery (SSRF). CVSS 3.1CRITICAL 9.8
  • TI-2026-46913 Improper check for unusual conditions in zalando skipper CVSS 3.1HIGH 8.2
  • TI-2026-19115 Skipper arbitrary code execution through lua filters CVSS 3.1HIGH 8.8
  • TI-2026-19725 Skipper Ingress Controller Allows Unauthorized Access to Internal Services via ExternalName CVSS 3.1HIGH 8.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences