{"id":"CVE-2026-103060","revision":"6e7cea66d0884a15b4849b9a531c6046","records":[{"revision":"6e7cea66d0884a15b4849b9a531c6046","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103060","aliases":[],"title":"Path traversal in rebar3 via unvalidated dependency app names","description":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in erlang rebar3 allows a malicious package publisher to delete a directory outside the project's _build directory and extract package files into it when a developer fetches dependencies.\n\nA package release's dependencies in a Hex registry carry an app field that names the dependency's OTP application. rebar3 uses this field as the dependency's name without validating it (rebar_packages:parse_deps/1) and builds the dependency's directory from that name (rebar_app_utils:dep_to_app/7). rebar_fetch:download_source_online/2 deletes that directory with rm -rf and moves the fetched package into it. hex.pm didn't restrict the field to a directory name before 2026-10-12, so a publisher could set it to a value such as ../../../../target. When a project depends on such a release directly or transitively, rebar3 get-deps deletes the directory the name resolves to and writes the dependency's files there. This happens before the dependency's own rebar.config.script is evaluated, and get-deps compiles nothing.\n\nThis issue affects rebar3: from 3.7.0-rc1 before 3.27.2.","state":0,"publishedAt":"2026-10-12T15:43:57.636+00:00","modifiedAt":"2026-10-16T17:44:16.145+00:00","affected":[{"ecosystem":"Vendor product","name":"rebar3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"rebar_packages\",\n                        \"rebar_app_utils\",\n                        \"rebar_fetch\"\n                    ],\n                    \"packageName\": \"rebar3\",\n                    \"packageURL\": \"pkg:otp/rebar3?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Frebar3&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Frebar3.git\",\n                    \"product\": \"rebar3\",\n                    \"programFiles\": [\n                        \"apps/rebar/src/rebar_packages.erl\",\n                        \"apps/rebar/src/rebar_app_utils.erl\",\n                        \"apps/rebar/src/rebar_fetch.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"rebar_packages:parse_deps/1\"\n                        },\n                        {\n                            \"name\": \"rebar_app_utils:dep_to_app/7\"\n                        },\n                        {\n                            \"name\": \"rebar_fetch:download_source/2\"\n                        },\n                        {\n                            \"name\": \"rebar_fetch:download_source_online/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/erlang/rebar3\",\n                    \"vendor\": \"erlang\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"3.27.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"3.7.0-rc1\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"erlang/rebar3","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"rebar_packages\",\n                        \"rebar_app_utils\",\n                        \"rebar_fetch\"\n                    ],\n                    \"packageName\": \"erlang/rebar3\",\n                    \"packageURL\": \"pkg:github/erlang/rebar3\",\n                    \"product\": \"rebar3\",\n                    \"programFiles\": [\n                        \"apps/rebar/src/rebar_packages.erl\",\n                        \"apps/rebar/src/rebar_app_utils.erl\",\n                        \"apps/rebar/src/rebar_fetch.erl\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"rebar_packages:parse_deps/1\"\n                        },\n                        {\n                            \"name\": \"rebar_app_utils:dep_to_app/7\"\n                        },\n                        {\n                            \"name\": \"rebar_fetch:download_source/2\"\n                        },\n                        {\n                            \"name\": \"rebar_fetch:download_source_online/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/erlang/rebar3\",\n                    \"vendor\": \"erlang\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"e35282b26e499b1d9e8f30bba9dccd71cd8b02ba\",\n                            \"status\": \"affected\",\n                            \"version\": \"56b7d88975aa8da6446857cfd92de0825024bf63\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/erlang/rebar3/security/advisories/GHSA-6ggr-r7mh-2mv8","https://cna.erlef.org/cves/CVE-2026-103060.html","https://osv.dev/vulnerability/EEF-CVE-2026-103060","https://github.com/erlang/rebar3/commit/56b7d88975aa8da6446857cfd92de0825024bf63","https://github.com/erlang/rebar3/commit/e35282b26e499b1d9e8f30bba9dccd71cd8b02ba"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103060","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103060","identifiers":["CVE-2026-103060"]},"retained":false,"historicalAffected":[]}],"coverage":[]}