CVE-2026-65604 | Skipper contains an incomplete fix for CVE-2026-50197 in whi… | CVSS 8.2 HIGH

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.

Metadata

CVE ID: CVE-2026-65604
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-22 10:48 UTC
Published: 2026-07-23 21:16 UTC
Last updated: 2026-07-23 21:16 UTC
Primary CWE: CWE-20
Improper Input Validation
Vendor / Product: zalando / skipper
Sources: cve.org · NVD

Severity & Metrics

8.2 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products (1)

Vendor	Product	Platform	Versions
zalando	skipper	—	—

Weakness (CWE)

CWE	Source	Description
CWE-20	cna	Improper Input Validation

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.8	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
8.2	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References (2)

GitHub Security Advisory (GHSA-8qqm-fp2q-v734) https://github.com/zalando/skipper/security/advisories/GHSA-8qqm-fp2q-v734
VulnCheck Advisory: Skipper Incomplete Fix for CVE-2026-50197 Policy Bypass https://www.vulncheck.com/advisories/skipper-incomplete-fix-for-cve-2026-50197-policy-bypass