{"id":"CVE-2026-29051","revision":"eee7e277fb184acea1bf657e8130da87","records":[{"revision":"eee7e277fb184acea1bf657e8130da87","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-29051","aliases":[],"title":"melange has Path Traversal via .PKGINFO in --persist-lint-results","description":"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-<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. 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.","state":0,"publishedAt":"2026-04-24T00:00:36.253+00:00","modifiedAt":"2026-04-24T13:10:10.825+00:00","affected":[{"ecosystem":"Vendor product","name":"melange","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"chainguard-dev\",\n                    \"product\": \"melange\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.32.0, < 0.43.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L","score":4.4,"severity":"MEDIUM"}],"references":["https://github.com/chainguard-dev/melange/security/advisories/GHSA-q2pw-xx38-p64j","https://github.com/chainguard-dev/melange/commit/84f3b450ce6e472c4abb8dc4c26d0ce8ac1259ac"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-29051","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-29051","identifiers":["CVE-2026-29051"]},"retained":false,"historicalAffected":[]}],"coverage":[]}