{"id":"GHSA-q2pw-xx38-p64j","summary":"melange has Path Traversal via .PKGINFO in --persist-lint-results","details":"### 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-\u003cpkgname\u003e-\u003cpkgver\u003e-r\u003cepoch\u003e.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.","aliases":["CVE-2026-29051","GO-2026-5562"],"modified":"2026-06-25T23:11:47.684644182Z","published":"2026-04-23T21:54:10Z","database_specific":{"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-04-23T21:54:10Z","nvd_published_at":"2026-04-24T00:16:27Z","cwe_ids":["CWE-22"]},"references":[{"type":"WEB","url":"https://github.com/chainguard-dev/melange/security/advisories/GHSA-q2pw-xx38-p64j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29051"},{"type":"WEB","url":"https://github.com/chainguard-dev/melange/commit/84f3b450ce6e472c4abb8dc4c26d0ce8ac1259ac"},{"type":"PACKAGE","url":"https://github.com/chainguard-dev/melange"}],"affected":[{"package":{"name":"chainguard.dev/melange","ecosystem":"Go","purl":"pkg:golang/chainguard.dev/melange"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.32.0"},{"fixed":"0.43.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q2pw-xx38-p64j/GHSA-q2pw-xx38-p64j.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"}]}