5.5

CVE-2026-25122: chainguard-dev apko Uncontrolled Resource Consumption

CVSS: 5.5v3.1MediumAnalyzed
AliasesCGA-22r7-5qjw-m64gCGA-w3wq-j3f8-h588GHSA-6p9p-q6wh-9j89
Published 04-02-2026Last modified 04-02-2026
Open JSON

Vulnerability summary

CVE-2026-25122 is a medium (CVSS 5.5) Uncontrolled Resource Consumption vulnerability in chainguard-dev apko. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0403-1CGA-F3VX-5MGF-MH7C

Timeline

  1. 04-02-2026
    PublishedVulnerability first disclosed.
  2. 04-02-2026
    Last modifiedVulnerability information updated.

Description

apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before 1.1.0, 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. This issue has been patched in version 1.1.0.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

+0.02 pp

From 0.11% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard6 products
  • amazon-ssm-agent< 3.3.3270.0-r5
  • amazon-ssm-agent-ecs-exec< 3.3.3270.0-r5
  • cg< 0.2.201-r0
  • chainctl< 0.2.206-r0
  • dagdotdev< 0.0.20-r6
Chainguard-dev1 product
  • apko≥ 0.14.8, < 1.1.0
Chainguard.dev1 product
  • apko≥ 0.14.8, < 1.1.0
Wolfi1 product
  • dagdotdev< 0.0.20-r6

4 vendors · 9 products

References

5 links