{"cve":"CVE-2026-29050","nvd":{"published":"2026-04-24T00:16:27.303","modified":"2026-10-26T22:10:00.163","status":"Analyzed","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 `/`.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-22"],"references":["https://github.com/chainguard-dev/melange/security/advisories/GHSA-98f2-w9h9-7fp9"],"products":["chainguard:melange"],"source":"nvd","synced_at":"2026-10-26T22:26:44.656832877+00:00"},"epss":{"cve":"CVE-2026-29050","score":0.0014,"percentile":0.03297,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-98f2-w9h9-7fp9","url":"https://osv.dev/vulnerability/GHSA-98f2-w9h9-7fp9","summary":"melange has Path Traversal When Resolving External Pipelines via Unvalidated pipeline[].uses","modified":"2026-06-25T19:56:00.944369828Z","packages":[{"ecosystem":"Go","name":"chainguard.dev/melange","purl":"pkg:golang/chainguard.dev/melange","ranges":[">=0.32.0 <0.43.4"],"fixed":["0.43.4"]}]},{"id":"GO-2026-5279","url":"https://osv.dev/vulnerability/GO-2026-5279","summary":"melange has Path Traversal When Resolving External Pipelines via Unvalidated pipeline[].uses in chainguard.dev/melange","modified":"2026-06-25T19:45:24.906969136Z","packages":[{"ecosystem":"Go","name":"chainguard.dev/melange","purl":"pkg:golang/chainguard.dev/melange","ranges":[">=0.32.0 <0.43.4"],"fixed":["0.43.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}