CVE-2026-65604 skipper vulnerability
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.
Browse Input Validation security risksQuick answer
zalando skipper should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-65604 affects skipper and involves input-validation failure. A crafted input may bypass the expected validation and trigger unintended behavior in the affected workflow. Prioritize internet-facing, privileged, automation, and production deployments. No confirmed fixed version is recorded for CVE-2026-65604; follow the linked vendor advisory, apply its mitigation, and update skipper as soon as a supported patched release is available.
- Inventory every deployment, device, package, plugin, container, build, and environment that uses skipper.
- Compare the installed package, build, firmware, or commit with the affected range in the linked vendor and NVD advisories.
- No confirmed fixed version is recorded for CVE-2026-65604; follow the linked vendor advisory, apply its mitigation, and update skipper as soon as a supported patched release is available.
- Until patched, reject untrusted values at the application or proxy boundary and disable the affected input path where practical.
- Review configuration, roles, tokens, network paths, and exposed endpoints connected to skipper; remove access that is not required.
- Review application, system, proxy, and audit logs for requests and behavior linked to the affected feature and CVE.
- If exploitation is suspected, isolate affected assets, preserve evidence, rotate exposed credentials or keys, restore trusted data, and rebuild compromised systems before returning them to service.
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Verify the fix
- Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-65604 in place.
- Use a safe regression test to confirm the affected input-validation failure path no longer produces the vulnerable behavior.
- Confirm temporary access controls, endpoint restrictions, network blocks, and least-privilege settings remain effective after the update.
- Review post-remediation logs and rerun Fixnx plus the relevant package, dependency, firmware, browser, or product-specific security check.
- Document affected assets, versions, changes, validation evidence, reviewed logs, and any credential rotation, cleanup, or replacement completed.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-65604?
zalando skipper should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.