PT-2026-6384 · Go · Chainguard.Dev/Apko

Published 2026-02-03 · Updated 2026-02-03

OSV

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

expandapk.Split drains the first gzip stream of an APK archive via io.Copy(io.Discard, gzi) without explicit bounds. With an attacker-controlled input stream, this can force large gzip inflation work and lead to resource exhaustion (availability impact).

The Split function reads the first tar header, then drains the remainder of the gzip stream by reading from the gzip reader directly without any maximum uncompressed byte limit or inflate-ratio cap. A caller that parses attacker-controlled APK streams may be forced to spend excessive CPU time inflating gzip data, leading to timeouts or process slowdown.

Fix: Fixed with 2be3903, Released in v1.1.0.

Acknowledgements

apko thanks Oleh Konko from 1seal for discovering and reporting this issue.

Fix

Allocation of Resources Without Limits

Resource Exhaustion

Weakness Enumeration

CWE-770

CWE-400

Related Identifiers

GHSA-6P9P-Q6WH-9J89

Affected Products

Chainguard.Dev/Apko

References · 5

• https://osv.dev/vulnerability/GHSA-6p9p-q6wh-9j89 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-25122 · Security Note
• https://github.com/chainguard-dev/apko · Note
• https://github.com/chainguard-dev/apko/commit/2be3903fe194ad46351840f0569b35f5ac965f09 · Note
• https://github.com/chainguard-dev/apko/security/advisories/GHSA-6p9p-q6wh-9j89 · Note