CVE-2026-54174Network attack vectorHinoki check available

Arbitrary file substitution via unchecked APK data hash

Published Sep 11, 2026 · Updated Sep 11, 2026

Integrity check bypass in Chainguard apko before 1.2.9 and Melange before 0.50.4 allows attackers to substitute APK package files. The installer verifies the APK control-section hash against the signed APKINDEX but never verifies the data-section hash covering installed files. Exploitation requires control of a mirror or cache, or a man-in-the-middle position during package retrieval, and places substituted files into built images.

CVSS severity8.3
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Integrity check bypass in Chainguard apko before 1.2.9 and Melange before 0.50.4 allows attackers to substitute APK package files. The installer verifies the APK control-section hash against the signed APKINDEX but never verifies the data-section hash covering installed files. Exploitation requires control of a mirror or cache, or a man-in-the-middle position during package retrieval, and places substituted files into built images.

The record

CVE
CVE-2026-54174
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Chainguard
Product
apko
Classifications
CWE-345, CWE-354, T1195.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=< 1.2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chainguard · apkoversion=< 1.2.9
Chainguard · Melangeversion=< 0.50.4

Published CVSS scores

8.3GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-354Improper Validation of Integrity Check Value
T1195.001Compromise Software Dependencies and Development Tools

Public exploit references

No public exploit references are available in this record.

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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