# CVE-2026-103060: Path traversal in rebar3 via unvalidated dependency app names

> A malicious package publisher can delete arbitrary directories and write files outside the project build directory when developers fetch dependencies using rebar3.

- **Severity:** High 7.5 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 12 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-103060, EEF-CVE-2026-103060, GHSA-6ggr-r7mh-2mv8, UBUNTU-CVE-2026-103060

## What is CVE-2026-103060?

CVE-2026-103060 is a high-severity path traversal vulnerability in erlang rebar3, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

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.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-103060?


## How do I fix CVE-2026-103060?

Upgrade to a fixed version.

## Is CVE-2026-103060 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103060 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-103060 and fix it if it is affected.

What it is: CVE-2026-103060 is a high-severity path traversal vulnerability in erlang rebar3, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-103060 exists.

Affected product: erlang rebar3. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-103060/ (Markdown: https://insights.sbomify.com/CVE-2026-103060/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-103060
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103060
- OSV: https://osv.dev/vulnerability/CVE-2026-103060

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-103060/
Summaries are generated and may contain mistakes; the official description above is the record.