{"schema_version":"1.9.0","id":"CVE-2026-25121","published":"2026-02-04T19:02:17.979Z","modified":"2026-08-12T03:51:08.600410416Z","aliases":["GHSA-5g94-c2wx-8pxw","GO-2026-4405"],"related":["CGA-8rrf-mq5r-w436","SUSE-SU-2026:0403-1","openSUSE-SU-2026:21483-1"],"summary":"apko is vulnerable to path traversal in apko dirFS which allows filesystem writes outside base","details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/chainguard-dev/apko","events":[{"introduced":"95e33993764a6a6f7cc4098453260cc6da7e71a1"},{"fixed":"3286a0b290e05ddd57b864f0465bb93aa6ea2484"},{"fixed":"d8b7887a968a527791b3c591ae83928cb49a9f14"}],"database_specific":{"cpe":"cpe:2.3:a:chainguard:apko:*:*:*:*:*:go:*:*","extracted_events":[{"introduced":"0.14.8"},{"fixed":"1.1.1"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v1.1.0","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.30.35","v0.30.34","v0.30.33","v0.30.32","v0.30.31","v0.30.30","v0.30.29","v0.30.28","v0.30.27","v0.30.26","v0.30.25","v0.30.24","v0.30.23","v0.30.22","v0.30.21","v0.30.20","v0.30.19","v0.30.18","v0.30.17","v0.30.16","v0.30.15","v0.30.14","v0.30.13","v0.30.12","v0.30.11","v0.30.10","v0.30.9","v0.30.8","v0.30.7","v0.30.6","v0.30.5","v0.30.4","v0.30.3","v0.30.2","v0.30.1","v0.30.0","v0.29.10","v0.29.9","v0.29.8","v0.29.7","v0.29.6","v0.29.5","v0.29.4","v0.29.3","v0.29.2","v0.29.1","v0.29.0","v0.28.0","v0.27.9","0.27.8","v0.27.7","v0.27.6","v0.27.5","v0.27.4","v0.27.3","v0.27.2","v0.27.1","v0.27.0","v0.26.1","v0.26.0","v0.25.7","v0.25.6","v0.25.5","v0.25.4","v0.25.3","v0.25.2","v0.25.1","v0.25.0","v0.24.0","v0.23.0","v0.22.7","v0.22.6","v0.22.5","v0.22.4","v0.22.3","v0.22.2","v0.22.1","v0.21.0","v0.20.2","v0.20.1","v0.20.0","v0.19.9","v0.19.8","v0.19.7","v0.19.6","v0.19.5","v0.19.4","v0.19.3","v0.19.2","v0.19.1","v0.19.0","v0.18.1","v0.18.0","v0.17.0","v0.16.0","v0.15.0","v0.14.9","v0.14.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25121.json"}}],"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25121.json"},{"type":"ADVISORY","url":"https://github.com/chainguard-dev/apko/security/advisories/GHSA-5g94-c2wx-8pxw"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25121"},{"type":"FIX","url":"https://github.com/chainguard-dev/apko/commit/d8b7887a968a527791b3c591ae83928cb49a9f14"}],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-23"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25121.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}