Path traversal in rebar3 via unvalidated dependency app names
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. A 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. This issue affects rebar3: from 3.7.0-rc1 before 3.27.2.
CVE-2026-103060
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-103060
rebar3
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
rebar3
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"cpes": [
"cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/erlang/rebar3",
"vendor": "erlang",
"modules": [
"rebar_packages",
"rebar_app_utils",
"rebar_fetch"
],
"product": "rebar3",
"versions": [
{
"status": "affected",
"version": "3.7.0-rc1",
"lessThan": "3.27.2",
"versionType": "semver"
}
],
"packageURL": "pkg:otp/rebar3?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Frebar3&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Frebar3.git",
"packageName": "rebar3",
"programFiles": [
"apps/rebar/src/rebar_packages.erl",
"apps/rebar/src/rebar_app_utils.erl",
"apps/rebar/src/rebar_fetch.erl"
],
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "rebar_packages:parse_deps/1"
},
{
"name": "rebar_app_utils:dep_to_app/7"
},
{
"name": "rebar_fetch:download_source/2"
},
{
"name": "rebar_fetch:download_source_online/2"
}
]
},
{
"cpes": [
"cpe:2.3:a:erlang:rebar3:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/erlang/rebar3",
"vendor": "erlang",
"modules": [
"rebar_packages",
"rebar_app_utils",
"rebar_fetch"
],
"product": "rebar3",
"versions": [
{
"status": "affected",
"version": "56b7d88975aa8da6446857cfd92de0825024bf63",
"lessThan": "e35282b26e499b1d9e8f30bba9dccd71cd8b02ba",
"versionType": "git"
}
],
"packageURL": "pkg:github/erlang/rebar3",
"packageName": "erlang/rebar3",
"programFiles": [
"apps/rebar/src/rebar_packages.erl",
"apps/rebar/src/rebar_app_utils.erl",
"apps/rebar/src/rebar_fetch.erl"
],
"collectionURL": "https://github.com",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "rebar_packages:parse_deps/1"
},
{
"name": "rebar_app_utils:dep_to_app/7"
},
{
"name": "rebar_fetch:download_source/2"
},
{
"name": "rebar_fetch:download_source_online/2"
}
]
}
]- Related CVEs
- CVE-2026-103060
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #32881 · Revision 1
- Added to Heist Feed
- Publisher date