CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NCVE-2026-25121
High (7.5) in chainguard apko. EPSS 0.4% chance of exploitation in the next 30 days. Fixed in chainguard.dev/apko 1.1.0.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-22, CWE-23
- Published
- Modified
- Record from
- the NVD, synced
Affected
- chainguard:apko
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5g94-c2wx-8pxw | Go | chainguard.dev/apko | >=0.14.8 <1.1.0 | 1.1.0 |
| GO-2026-4405 | Go | chainguard.dev/apko | >=0.14.8 <1.1.0 | 1.1.0 |