CVE-2026-65838Public exploitNetwork attack vectorHinoki check available

Authorization bypass via oversized declared body

Published Sep 14, 2026 · Updated Sep 14, 2026

Authorization bypass in Zalando Skipper before 0.27.35 allows remote attackers to send policy-forbidden bodies to protected services. ExtractHttpBodyOptionally skips parsing when declared Content-Length exceeds the configured limit, leaving OPA with an empty parsed_body while forwarding the full body upstream. Exposure requires opaAuthorizeRequestWithBody and a deny-on-presence Rego policy that does not reject truncated_body, allowing unauthenticated network requests to evade body-content authorization.

CVSS severity8.2
High
EPSS probability0.27%
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 0.27.35 allows remote attackers to send policy-forbidden bodies to protected services. ExtractHttpBodyOptionally skips parsing when declared Content-Length exceeds the configured limit, leaving OPA with an empty parsed_body while forwarding the full body upstream. Exposure requires opaAuthorizeRequestWithBody and a deny-on-presence Rego policy that does not reject truncated_body, allowing unauthenticated network requests to evade body-content authorization.

The record

CVE
CVE-2026-65838
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
Zalando
Product
Skipper
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 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=< 0.27.35

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zalando · Skipperversion=< 0.27.35

Published CVSS scores

8.2ZalandoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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

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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