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CVE-2026-65604 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CNA: [email protected]CVSS-B:8.2 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734	CISA-ADP	AdvisoryExploitRemedyVendor
https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734	[email protected]	AdvisoryExploitRemedyVendor
https://www.vulncheck.com/advisories/skipper-incomplete-fix-for-cve-2026-50197-policy-bypass	[email protected]	AdvisoryRemedy

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-20	Improper Input Validation	[email protected]

Affected Products

Product	Versions
Zalando Skipper	< 0.27.26 (semver)
CPE cpe:2.3:a:zalando:skipper:::::::: Remediation Workaround:low effort Configure Open Policy Agent (OPA) to deny requests with oversized bodies. Example policy: default allow := false allow if { input.attributes.request.http.truncated_body == false # ... body-based conditions } Example policy to allow by default and deny oversized bodies: default deny := false deny if { input.attributes.request.http.truncated_body == true # ... body-based conditions } Workaround:low efforthttps://github.com/zalando/skipper/releases/tag/v0.27.26

Product

Versions

Zalando Skipper

< 0.27.26 (semver)

CPE

cpe:2.3:a:zalando:skipper:*:*:*:*:*:*:*:*

Remediation

Workaround:low effort
Configure Open Policy Agent (OPA) to deny requests with oversized bodies. Example policy: default allow := false allow if { input.attributes.request.http.truncated_body == false # ... body-based conditions } Example policy to allow by default and deny oversized bodies: default deny := false deny if { input.attributes.request.http.truncated_body == true # ... body-based conditions }
Workaround:low efforthttps://github.com/zalando/skipper/releases/tag/v0.27.26

Change History

2 change records found show changes

Date	Action	Recorded By
Jul 24, 2026	CVE Modified	CISA-ADP
Jul 23, 2026	New CVE Received	[email protected]