CVE-2026-65604: Improper Input Validation in zalando skipper
Skipper contains an incomplete fix for CVE-2026-50197 in which oversized request bodies bypass Open Policy Agent (OPA) deny-on-presence Rego policies. When a request body exceeds the configured maxBodyBytes limit, Skipper forwards the full payload to the upstream service while OPA evaluates against an empty parsed_body, so policies that deny requests based on body content are not enforced and forbidden actions proceed. No fixed version is available; v0.27.26 adds documentation guidance only.
AI Analysis
Technical Summary
This vulnerability in Zalando Skipper arises from an incomplete remediation of CVE-2026-50197. Specifically, if an HTTP request body exceeds the maxBodyBytes configuration, Skipper forwards the full payload upstream while OPA evaluates policies against an empty parsed body. This results in OPA deny-on-presence Rego policies not being enforced for oversized bodies, allowing potentially forbidden actions to proceed. There is no official fix available yet; version 0.27.26 only provides documentation updates without resolving the issue.
Potential Impact
The vulnerability allows attackers to bypass OPA deny-on-presence policies that rely on request body content by sending oversized request bodies. This can lead to unauthorized or forbidden actions being executed on upstream services, undermining policy enforcement and potentially exposing sensitive operations or data.
Mitigation Recommendations
No official fix or patch is currently available for this vulnerability. Version 0.27.26 of Skipper includes only documentation guidance and does not resolve the issue. Users should monitor vendor advisories for updates and consider implementing additional controls outside of Skipper to enforce request body size limits or policy enforcement until an official fix is released.
CVE-2026-65604: Improper Input Validation in zalando skipper
Description
Skipper contains an incomplete fix for CVE-2026-50197 in which oversized request bodies bypass Open Policy Agent (OPA) deny-on-presence Rego policies. When a request body exceeds the configured maxBodyBytes limit, Skipper forwards the full payload to the upstream service while OPA evaluates against an empty parsed_body, so policies that deny requests based on body content are not enforced and forbidden actions proceed. No fixed version is available; v0.27.26 adds documentation guidance only.
CVSS v4.0
Score 8.8high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Zalando Skipper arises from an incomplete remediation of CVE-2026-50197. Specifically, if an HTTP request body exceeds the maxBodyBytes configuration, Skipper forwards the full payload upstream while OPA evaluates policies against an empty parsed body. This results in OPA deny-on-presence Rego policies not being enforced for oversized bodies, allowing potentially forbidden actions to proceed. There is no official fix available yet; version 0.27.26 only provides documentation updates without resolving the issue.
Potential Impact
The vulnerability allows attackers to bypass OPA deny-on-presence policies that rely on request body content by sending oversized request bodies. This can lead to unauthorized or forbidden actions being executed on upstream services, undermining policy enforcement and potentially exposing sensitive operations or data.
Mitigation Recommendations
No official fix or patch is currently available for this vulnerability. Version 0.27.26 of Skipper includes only documentation guidance and does not resolve the issue. Users should monitor vendor advisories for updates and consider implementing additional controls outside of Skipper to enforce request body size limits or policy enforcement until an official fix is released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-07-22T10:48:36.000Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a6289ae9c2644c7f8c05bc2
Added to database: 07/23/2026, 21:37:50 UTC
Last enriched: 07/30/2026, 23:03:35 UTC
Last updated: 09/05/2026, 22:52:12 UTC
Views: 85
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