CVE-2026-85747Public exploitNetwork attack vectorHinoki check available

Manifest substitution via missing digest verification

Published Oct 13, 2026 · Updated Oct 13, 2026

Integrity bypass in CNCF Distribution before 3.1.2 allows remote attackers to substitute manifests via registry responses. The registry/client manifests.Get method passes response bytes to distribution.UnmarshalManifest without comparing their hash with the requested digest. Exploitation requires upstream registry control or connection interception; the bundled pull-through proxy caches and re-serves substituted manifests.

CVSS severity6.8
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integrity bypass in CNCF Distribution before 3.1.2 allows remote attackers to substitute manifests via registry responses. The registry/client manifests.Get method passes response bytes to distribution.UnmarshalManifest without comparing their hash with the requested digest. Exploitation requires upstream registry control or connection interception; the bundled pull-through proxy caches and re-serves substituted manifests.

The record

CVE
CVE-2026-85747
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
CNCF Distribution
Product
Distribution
Classifications
T1195.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 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=< 3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CNCF Distribution · Distributionversion=< 3.1.2

Published CVSS scores

6.8CNCF DistributionCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1195.002Compromise Software Supply Chain

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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