CVE-2026-50197Public exploitNetwork attack vectorHinoki check available

Authorization bypass via negative content-length body parsing

Published Jul 17, 2026 · Updated Jul 17, 2026

Authorization bypass in Zalando Skipper before 0.26.10 allows remote attackers to send policy-blocked bodies to upstream services. The opaAuthorizeRequestWithBody path passes ContentLength -1 into fillBuffer, which returns an empty raw_body and parsed_body while forwarding the full chunked or HTTP/2 payload. Exploitation requires the OPA body-authorization filter and a body-dependent Rego deny policy; affected requests can perform actions that the upstream service was meant to reject.

CVSS severity8.5
High
EPSS probability0.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in Zalando Skipper before 0.26.10 allows remote attackers to send policy-blocked bodies to upstream services. The opaAuthorizeRequestWithBody path passes ContentLength -1 into fillBuffer, which returns an empty raw_body and parsed_body while forwarding the full chunked or HTTP/2 payload. Exploitation requires the OPA body-authorization filter and a body-dependent Rego deny policy; affected requests can perform actions that the upstream service was meant to reject.

The record

CVE
CVE-2026-50197
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Zalando
Product
Skipper
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.26.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zalando · Skipperversion=< 0.26.10

Published CVSS scores

8.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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