{"id":"GHSA-qq3r-w4hj-gjp6","revision":null,"records":[{"revision":"0c7f79a8b4dd4050b70f9358771c0bf6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42574","aliases":[],"title":"apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root","description":"apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before version 1.2.5, a crafted .apk could install a TypeSymlink tar entry whose target pointed outside the build root, and a subsequent directory-creation or file-write entry in the same or later archive could traverse that symlink to reach host paths the build user could write to. This issue has been patched in version 1.2.5.","state":0,"publishedAt":"2026-05-09T19:24:48.497+00:00","modifiedAt":"2026-05-11T17:11:40.244+00:00","affected":[{"ecosystem":"Vendor product","name":"apko","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"chainguard-dev\",\n                    \"product\": \"apko\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.14.8, < 1.2.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/chainguard-dev/apko/security/advisories/GHSA-qq3r-w4hj-gjp6","https://github.com/chainguard-dev/apko/pull/2187","https://github.com/chainguard-dev/apko/commit/f5a96e1299ac81c7ea9441705ec467688086f442","https://github.com/chainguard-dev/apko/releases/tag/v1.2.5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-42574","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-42574","identifiers":["CVE-2026-42574"]},"retained":false,"historicalAffected":[]},{"revision":"67818edde6444c6c9a61a67d18ccacf1","observedAt":"2026-11-13T12:04:05.925+00:00","statement":{"source":"euvd","id":"EUVD-2026-28932","aliases":["CVE-2026-42574","GHSA-qq3r-w4hj-gjp6"],"title":"apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before version 1.2.5, a crafted .apk could install a TypeSymlink tar entry whose target pointed outside the build root, and a subseq…","description":"apko allows users to build and publish OCI container images built from apk packages. From version 0.14.8 to before version 1.2.5, a crafted .apk could install a TypeSymlink tar entry whose target pointed outside the build root, and a subsequent directory-creation or file-write entry in the same or later archive could traverse that symlink to reach host paths the build user could write to. 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From version 0.14.8 to before version 1.2.5, a crafted .apk could install a TypeSymlink tar entry whose target pointed outside the build root, and a subsequent directory-creation or file-write entry in the same or later archive could traverse that symlink to reach host paths the build user could write to. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-42574","identifiers":["CVE-2026-42574"]},"retained":false,"historicalAffected":[]},{"revision":"f17b98fd8041474ba16777110e20b1e7","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-qq3r-w4hj-gjp6","aliases":["CVE-2026-42574","GO-2026-5589"],"title":"apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root","description":"### Impact\n\nA crafted `.apk` could install a `TypeSymlink` tar entry whose target pointed outside the build root, and a subsequent directory-creation or file-write entry in the same or later archive could traverse that symlink to reach host paths the build user could write to. The root cause was the `sanitizePath` helper in `pkg/apk/fs/rwosfs.go`, which rejected only lexical `..` traversal and did not resolve or refuse symlinks. Every disk-backed `DirFS` method that handed its caller-supplied path to a symlink-following stdlib call — `ReadFile`, `WriteFile`, `Chmod`, `Chown`, `Chtimes`, `MkdirAll`, `Mkdir`, and `Mknod` — was affected. The reachable primitive from a malicious APK during tar extraction is the `MkdirAll` / `Mkdir` / `WriteFile` chain via `apko build-cpio` and disk-backed consumers such as `melange`; the remaining sinks are reachable by direct callers of the `pkg/apk/fs` package. The in-memory `tarfs` install path used by `apko build`, `apko publish`, and `apko build-minirootfs` is not affected.\n\n### Patches\n\nFixed in apko **v1.2.5** by [#2187](https://github.com/chainguard-dev/apko/pull/2187) / commit [f5a96e1](https://github.com/chainguard-dev/apko/commit/f5a96e1299ac81c7ea9441705ec467688086f442), which scopes all `DirFS` operations through a Go 1.24 `*os.Root`. The `sanitizePath` helper has been removed; `*os.Root` refuses traversal via `..`, absolute-target symlinks, relative-target symlinks, and hardlinks by construction. Regression tests in `pkg/apk/apk/path_traversal_test.go` cover each composite primitive.\n\n### Workarounds\n\nNo complete workaround. Operators running pre-1.2.5 apko (or downstream tools such as melange that embed pre-1.2.5 `pkg/apk/fs`) should upgrade. Consuming only APKs from trusted, signed sources reduces but does not eliminate exposure.\n\n### Resources\n\n- https://github.com/chainguard-dev/apko/pull/2187\n- https://github.com/chainguard-dev/apko/commit/f5a96e1299ac81c7ea9441705ec467688086f442\n- https://github.com/chainguard-dev/apko/releases/tag/v1.2.5\n- Related: GHSA-5g94-c2wx-8pxw (CVE-2026-25121) — prior lexical `..` traversal fix\n\n### Credits\n\napko thanks Oleh Konko ([@1seal](https://github.com/1seal) from [1seal.org](https://1seal.org/)) for the initial report of the symlink-escape class, and to [@Xh081iX](https://github.com/Xh081iX) for a follow-up set of reports covering additional reachable primitives (`ReadFile`, `Chmod`/`Chown`, `Mknod`, `MkdirAll`/`Mkdir`) that shaped the comprehensive fix.","state":0,"publishedAt":"2026-05-04T21:26:47+00:00","modifiedAt":"2026-09-10T03:51:06.9206496+00:00","affected":[{"ecosystem":"Go","name":"chainguard.dev/apko","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.14.8"},{"kind":"fixed","version":"1.2.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/chainguard-dev/apko/security/advisories/GHSA-qq3r-w4hj-gjp6","https://nvd.nist.gov/vuln/detail/CVE-2026-42574","https://github.com/chainguard-dev/apko/pull/2187","https://github.com/chainguard-dev/apko/commit/f5a96e1299ac81c7ea9441705ec467688086f442","https://github.com/chainguard-dev/apko","https://github.com/chainguard-dev/apko/releases/tag/v1.2.5"],"sourceUrl":"https://github.com/advisories/GHSA-qq3r-w4hj-gjp6","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qq3r-w4hj-gjp6","identifiers":["GHSA-qq3r-w4hj-gjp6","CVE-2026-42574","GO-2026-5589"]},"retained":false,"historicalAffected":[]},{"revision":"047b662093764c52870f39b865aa721c","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5589","aliases":["CVE-2026-42574","GHSA-qq3r-w4hj-gjp6"],"title":"apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root in chainguard.dev/apko","description":"apko dirFS has a symlink-following path traversal that allows multiple entry points to escape the build root in chainguard.dev/apko","state":0,"publishedAt":"2026-06-25T22:34:34+00:00","modifiedAt":"2026-06-25T23:01:32.6374453+00:00","affected":[{"ecosystem":"Go","name":"chainguard.dev/apko","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.14.8"},{"kind":"fixed","version":"1.2.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/chainguard-dev/apko/security/advisories/GHSA-qq3r-w4hj-gjp6","https://nvd.nist.gov/vuln/detail/CVE-2026-42574","https://github.com/chainguard-dev/apko/commit/f5a96e1299ac81c7ea9441705ec467688086f442","https://github.com/chainguard-dev/apko/pull/2187","https://github.com/chainguard-dev/apko/releases/tag/v1.2.5"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5589","license":"OSV · upstream source license applies","key":"osv:GO-2026-5589","identifiers":["GO-2026-5589","CVE-2026-42574","GHSA-qq3r-w4hj-gjp6"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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