CVE-2026-25121 json
apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base
published 2026-02-03 9 mo ago modified 2026-09-10 1 mo ago also GHSA-5g94-c2wx-8pxw , GO-2026-4405 , EUVD-2026-5380
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before 1.1.1, a path traversal vulnerability was discovered in apko's dirFS filesystem abstraction. An attacker who can supply a malicious APK package (e.g., via a compromised or typosquatted repository) could create directories or symlinks outside the intended installation root. The MkdirAll, Mkdir, and Symlink methods in pkg/apk/fs/rwosfs.go use filepath.Join() without validating that the resulting path stays within the base directory. This issue has been patched in version 1.1.1.
Patch / fix
- go chainguard.dev/apko 1.1.0
- chainguard apko 1.1.1
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260205T172317-150000.1.146.1
suse advisories SUSE-SU-2026:0403-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 9 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | chainguard.dev/apko | >=0.14.8, <1.1.0 |
1.1.0 |
Affected products
- chainguard-dev apko
Classification
References
-
github.com
/chainguard-dev/apko/commit/d8b7887a968a527791b3c591ae83928cb49a9f14
web, patch
-
github.com
/chainguard-dev/apko/security/advisories/GHSA-5g94-c2wx-8pxw
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-25121
advisory
-
github.com
/chainguard-dev/apko
package
Sources
- CVE List CVE-2026-25121
- GitHub Advisory GHSA-5g94-c2wx-8pxw
- NVD CVE-2026-25121
- OSV GO-2026-4405
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