{"id":"GHSA-q2pw-xx38-p64j","revision":"8d24f41493a84a89b105b8a1fc3d7014","records":[{"revision":"8d24f41493a84a89b105b8a1fc3d7014","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-q2pw-xx38-p64j","aliases":["CVE-2026-29051","GO-2026-5562"],"title":"melange has Path Traversal via .PKGINFO in --persist-lint-results","description":"### Impact\n\n`melange lint --persist-lint-results` (opt-in flag, also usable via `melange build --persist-lint-results`) constructs output file paths by joining `--out-dir` with the `arch` and `pkgname` values read from the `.PKGINFO` control file of the APK being linted. In affected versions these values were not validated for path separators or `..` sequences, so an attacker who can supply an APK to a melange-based lint/build pipeline (e.g. CI that lints third-party APKs, or build-as-a-service) could cause melange to write `lint-<pkgname>-<pkgver>-r<epoch>.json` to an arbitrary `.json` path reachable by the melange process. The written file is a JSON lint report whose content is partially attacker-influenced. There is no direct code-execution path, but the write can clobber other JSON artifacts on the filesystem. The issue only affects deployments that explicitly pass `--persist-lint-results`; the flag is off by default.\n\n### Patches\n\nFixed in melange **v0.43.4** by validating `arch` and `pkgname` for `..`, `/`, and `filepath.Separator` before path construction in `pkg/linter/results.go` (commit [84f3b45](https://github.com/chainguard-dev/melange/commit/84f3b450ce6e472c4abb8dc4c26d0ce8ac1259ac)).\n\n### Workarounds\n\nDo not pass `--persist-lint-results` when linting or building APKs whose `.PKGINFO` contents are not fully trusted. Running melange as a low-privileged user and confining writes to an isolated directory also limits impact.\n\n### Credits\n\nmelange thanks Oleh Konko ([@1seal](https://github.com/1seal) from [1seal.org](https://1seal.org/)) for discovering and reporting this issue.","state":0,"publishedAt":"2026-04-23T21:54:10+00:00","modifiedAt":"2026-06-25T23:11:46.7106109+00:00","affected":[{"ecosystem":"Go","name":"chainguard.dev/melange","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.32.0"},{"kind":"fixed","version":"0.43.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/chainguard-dev/melange/security/advisories/GHSA-q2pw-xx38-p64j","https://nvd.nist.gov/vuln/detail/CVE-2026-29051","https://github.com/chainguard-dev/melange/commit/84f3b450ce6e472c4abb8dc4c26d0ce8ac1259ac","https://github.com/chainguard-dev/melange"],"sourceUrl":"https://github.com/advisories/GHSA-q2pw-xx38-p64j","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-q2pw-xx38-p64j","identifiers":["GHSA-q2pw-xx38-p64j","CVE-2026-29051","GO-2026-5562"]},"retained":false,"historicalAffected":[]}],"coverage":[]}