CVE-2026-65604Public exploitNetwork attack vector

Unauthenticated policy bypass via oversized request bodies

Published Jul 23, 2026 · Updated Jul 23, 2026

Authorization bypass in Zalando Skipper before 0.27.35 allows remote attackers to send forbidden requests via oversized bodies. ExtractHttpBodyOptionally skips body extraction when declared Content-Length exceeds maxBodyBytes, leaving OPA parsed_body empty while forwarding the full payload upstream. Deployments are exposed only when opaAuthorizeRequestWithBody enforces deny-on-presence Rego policies; unauthenticated requests can then evade body-based controls.

CVSS severity8.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Zalando Skipper before 0.27.35 allows remote attackers to send forbidden requests via oversized bodies. ExtractHttpBodyOptionally skips body extraction when declared Content-Length exceeds maxBodyBytes, leaving OPA parsed_body empty while forwarding the full payload upstream. Deployments are exposed only when opaAuthorizeRequestWithBody enforces deny-on-presence Rego policies; unauthenticated requests can then evade body-based controls.

The record

CVE
CVE-2026-65604
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
Zalando
Product
Skipper
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zalando · SkipperAffected versions are unavailable in this record.

Published CVSS scores

8.2VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-20Improper Input Validation
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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