High

rebar3 — security advisory

Type: advisorySources: OSVAdvisory ID: UBUNTU-CVE-2026-103060

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.

Products: rebar3
Affected versions: 3.18.0-1, 3.19.0-1, 3.24.0-1, 3.25.1-1, 3.26.0-1, 3.27.0-3, 3.27.0-4, 3.27.0-6
Fixed versions: Not specified
CVEs: CVE-2026-103060
Confirmed fixed CVEs: Not specified
Updated in this feed: 31 Oct 2026, 01:57 UTC · Revision 1

Source evidence

UBUNTU-CVE-2026-103060

core-osv · Original source

Published 12 Oct 2026, 16:17 UTC

osv:UBUNTU-CVE-2026-103060

rebar3

Fixed versions: Not specified

rebar3

Fixed versions: Not specified

rebar3

Fixed versions: Not specified

rebar3

Fixed versions: Not specified

Complete source record

{
  "id": "7e360847cd5fc207373c5e529864a5b38f1d5944913b6cdff2cdd26c032cfc7e",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-103060",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-103060",
    "summary": "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.",
    "evidence": "osv:UBUNTU-CVE-2026-103060",
    "products": [
      {
        "name": {
          "value": "rebar3",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.18.0-1",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rebar3",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.19.0-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rebar3",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.26.0-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.27.0-3",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.27.0-4",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.27.0-6",
            "evidence": "/affected/2/versions"
          }
        ]
      },
      {
        "name": {
          "value": "rebar3",
          "evidence": "/affected/3/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "3.24.0-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "3.25.1-1",
            "evidence": "/affected/3/versions"
          },
          {
            "value": "3.26.0-1",
            "evidence": "/affected/3/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "UBUNTU-CVE-2026-103060",
      "aliases": [
        "UBUNTU-CVE-2026-103060"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rebar3",
            "purl": "pkg:deb/ubuntu/rebar3?arch=source&distro=jammy",
            "ecosystem": "Ubuntu:22.04:LTS"
          },
          "versions": [
            "3.18.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103060.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "rebar3",
                "binary_version": "3.18.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rebar3",
            "purl": "pkg:deb/ubuntu/rebar3?arch=source&distro=noble",
            "ecosystem": "Ubuntu:24.04:LTS"
          },
          "versions": [
            "3.19.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103060.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "rebar3",
                "binary_version": "3.19.0-1"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rebar3",
            "purl": "pkg:deb/ubuntu/rebar3?arch=source&distro=stonking",
            "ecosystem": "Ubuntu:26.10"
          },
          "versions": [
            "3.26.0-1",
            "3.27.0-3",
            "3.27.0-4",
            "3.27.0-6"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103060.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "rebar3",
                "binary_version": "3.27.0-6"
              }
            ]
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "rebar3",
            "purl": "pkg:deb/ubuntu/rebar3?arch=source&distro=resolute",
            "ecosystem": "Ubuntu:26.04:LTS"
          },
          "versions": [
            "3.24.0-1",
            "3.25.1-1",
            "3.26.0-1"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103060.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "rebar3",
                "binary_version": "3.26.0-1"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:57:57.403529450Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-103060"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-103060",
        "https://www.cve.org/CVERecord?id=CVE-2026-103060",
        "https://cna.erlef.org/cves/CVE-2026-103060.html",
        "https://github.com/erlang/rebar3/commit/56b7d88975aa8da6446857cfd92de0825024bf63",
        "https://github.com/erlang/rebar3/commit/e35282b26e499b1d9e8f30bba9dccd71cd8b02ba",
        "https://github.com/erlang/rebar3/security/advisories/GHSA-6ggr-r7mh-2mv8",
        "https://osv.dev/vulnerability/EEF-CVE-2026-103060"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-103060",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 357776,
  "published_at": "2026-10-12T16:17:00+00:00"
}