{"id":"CVE-2026-29050","revision":"ab8980eacbba471e9f7bc93e2f8143f1","records":[{"revision":"ab8980eacbba471e9f7bc93e2f8143f1","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-29050","aliases":[],"title":"melange has Path Traversal When Resolving External Pipelines via Unvalidated pipeline[].uses","description":"melange allows users to build apk packages using declarative pipelines. Starting in version 0.32.0 and prior to version 0.43.4, an attacker who can influence a melange configuration file — for example through pull-request-driven CI or build-as-a-service scenarios — could set `pipeline[].uses` to a value containing `../` sequences or an absolute path. The `(*Compiled).compilePipeline` function in `pkg/build/compile.go` passed `uses` directly to `filepath.Join(pipelineDir, uses + \".yaml\")` without validating the value, so the resolved path could escape each `--pipeline-dir` and read an arbitrary YAML-parseable file visible to the melange process. Because the loaded file is subsequently interpreted as a melange pipeline and its `runs:` block is executed via `/bin/sh -c` in the build sandbox, this additionally allowed shell commands sourced from an out-of-tree file to run during the build, bypassing the review boundary that normally covers the in-tree pipeline definition. The issue is fixed in melange v0.43.4 via commit 5829ca4. The fix rejects `uses` values that are absolute paths or contain `..`, and verifies (via `filepath.Rel` after `filepath.Clean`) that the resolved target remains within the pipeline directory. As a workaround, only run `melange build` against configuration files from trusted sources. In CI systems that build user-supplied melange configs, gate builds behind manual review of `pipeline[].uses` values and reject any containing `..` or leading `/`.","state":0,"publishedAt":"2026-04-23T23:58:39.668+00:00","modifiedAt":"2026-04-25T01:38:30.604+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:H/I:L/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/chainguard-dev/melange/security/advisories/GHSA-98f2-w9h9-7fp9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-29050","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-29050","identifiers":["CVE-2026-29050"]},"retained":false,"historicalAffected":[]}],"coverage":[]}