{"id":"CVE-2026-29051","summary":"melange has Path Traversal via .PKGINFO in --persist-lint-results","details":"melange allows users to build apk packages using declarative pipelines. Starting in version 0.32.0 and prior to version 0.43.4, `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. The issue is fixed in melange v0.43.4 by validating `arch` and `pkgname` for `..`, `/`, and `filepath.Separator` before path construction in `pkg/linter/results.go` (commit 84f3b45). As a workaround, do 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.","aliases":["GHSA-q2pw-xx38-p64j","GO-2026-5562"],"modified":"2026-07-08T08:12:27.159953161Z","published":"2026-04-24T00:00:36.253Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29051.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0.32.0"},{"fixed":"0.43.4"}]}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-22"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29051.json"},{"type":"ADVISORY","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":"FIX","url":"https://github.com/chainguard-dev/melange/commit/84f3b450ce6e472c4abb8dc4c26d0ce8ac1259ac"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/chainguard-dev/melange","events":[{"introduced":"0"},{"fixed":"84f3b450ce6e472c4abb8dc4c26d0ce8ac1259ac"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v0.43.3","v0.43.2","v0.43.1","v0.43.0","v0.42.0","v0.41.1","v0.41.0","v0.40.5","v0.40.4","v0.40.3","v0.40.2","v0.40.1","v0.40.0","v0.39.0","v0.38.1","v0.38.0","v0.37.5","v0.37.4","v0.37.3","v0.37.2","v0.37.1","v0.37.0","v0.36.0","v0.35.1","v0.35.0","v0.34.3","v0.34.2","v0.34.1","v0.34.0","v0.33.2","v0.33.1","v0.33.0","v0.32.0","v0.31.9","v0.31.8","v0.31.7","v0.31.6","v0.31.5","v0.31.4","v0.31.3","v0.31.2","v0.31.1","v0.31.0","v0.30.6","v0.30.5","v0.30.4","v0.30.3","v0.30.2","v0.30.1","v0.30.0","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","v0.27.0","v0.26.13","v0.26.12","v0.26.11","v0.26.10","v0.26.9","v0.26.8","v0.26.7","v0.26.6","v0.26.5","v0.26.4","v0.26.3","v0.26.2","v0.26.1","v0.26.0","v0.25.1","v0.25.0","v0.24.0","v0.23.17","v0.23.16","v0.23.15","v0.23.14","v0.23.13","v0.23.12","v0.23.11","v0.23.10","v0.23.9","v0.23.8","v0.23.7","v0.23.6","v0.23.5","v0.23.4","v0.23.3","v0.23.2","v0.23.1","v0.23.0","v0.22.2","v0.22.1","v0.22.0","v0.21.2","v0.21.1","v0.21.0","v0.20.1","v0.20.0","v0.19.5","v0.19.4","v0.19.3","v0.19.1","v0.19.2","v0.19.0","v0.18.3","v0.18.2","v0.18.1","v0.18.0","v0.17.7","v0.17.6","v0.17.5","v0.17.4","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.16.0","v0.15.14","v0.15.13","v0.15.12","v0.15.7","v0.15.11","v0.15.10","v0.15.9","v0.15.8","v0.15.6","v0.15.5","v0.15.4","v0.14.8","v0.15.3","v0.15.2","v0.14.9","v0.15.1","v0.15.0","v0.14.11","v0.14.10","v0.14.7","v0.14.6","v0.14.5","v0.14.4","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.13.7","v0.13.6","v0.13.5","v0.13.4","v0.13.3","v0.13.2","v0.13.1","v0.13.0","v0.12.1","v0.12.0","v0.11.6","v0.11.5","v0.11.4","v0.11.3","v0.11.2","v0.11.1","v0.11.0","v0.10.4","v0.10.3","v0.10.2","v0.10.1","v0.10.0","v0.9.0","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.11","v0.6.10","v0.6.1","v0.6.9","v0.6.7","v0.6.8","v0.6.6","v0.6.5","v0.6.4","v0.6.3","v0.6.2","v0.6.0","v0.5.10","v0.5.9","v0.5.8","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29051.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"}]}