GHSA-fpg8-7664-jc5q: chainguard.dev/apko (CVE-2026-54174)

melange: Incomplete package integrity verification allows data section substitution

CVSS 8.3 HighEPSS 0.0015 · 4th percentile

Published by the GitHub Advisory Database at 10 Jul 2026, 21:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
chainguard.dev/apko	Go	<1.2.9	1.2.9
chainguard.dev/melange	Go	<0.50.4	0.50.4

Identifiers

GHSA-fpg8-7664-jc5q · CVE-2026-54174 · GO-2026-5968

Weakness (CWE)

CWE-345 · CWE-354

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The chainguard.dev/apko Go module before 1.2.9 and chainguard.dev/melange before 0.50.4 check only the control section hash of packages, not the data section. An attacker who can compromise a mirror, poison a cache, or intercept a fetch can substitute the installed file contents. Upgrade apko to 1.2.9 or melange to 0.50.4.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.3	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0015, the 4th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:14 UTC First seen by agentprime
31 Oct 2026, 14:14 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.