CVE-2026-43965 (GCVE-0-2026-43965)

Vulnerability from cvelistv5 – Published: 2026-06-02 13:41 – Updated: 2026-06-02 19:14
VLAI
Title
Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion
Summary
Path traversal vulnerability in Gleam's dependency management allows arbitrary directory deletion via malicious build/packages/packages.toml content. Package keys read from build/packages/packages.toml by LocalPackages::read_from_disc are passed without validation to paths.build_packages_package(), which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to fs::delete_directory (which calls remove_dir_all). No check is performed to ensure the path remains within the intended build/packages/ directory. Both absolute paths and relative traversal sequences (e.g. ../) are accepted as package keys, allowing deletion of arbitrary directories. An attacker who can cause a victim to run gleam deps download on a project containing a malicious build/packages/packages.toml (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim's system to be recursively deleted. This issue affects Gleam from 0.18.0-rc1 until 1.17.0.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
EEF
Impacted products
Vendor Product Version
Gleam Gleam Affected: 0.18.0-rc1 , < 1.17.0 (semver)
    cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
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Gleam Gleam Affected: 0.18.0-rc1 , < 1.17.0 (semver)
Affected: ed7aec0484f10d60978b63788c8a6497590855ab , < 690ca069817bee5f77a28fc3e360627c1da19291 (git)
    cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
Create a notification for this product.
Gleam Gleam Affected: v0.18.0-rc1-elixir , < v1.17.0-elixir (other)
Affected: v0.18.0-rc1-erlang , < v1.17.0-erlang (other)
Affected: v0.18.0-rc1-node , < v1.17.0-node (other)
Affected: v0.18.0-rc1-node-slim , < v1.17.0-node-slim (other)
Affected: v0.18.0-rc1-elixir-slim , < v1.17.0-elixir-slim (other)
Affected: v0.18.0-rc1-erlang-slim , < v1.17.0-erlang-slim (other)
Affected: v0.18.0-rc1-erlang-alpine , < v1.17.0-erlang-alpine (other)
Affected: v0.18.0-rc1-elixir-alpine , < v1.17.0-elixir-alpine (other)
Affected: v0.18.0-rc1-node-alpine , < v1.17.0-node-alpine (other)
Affected: v0.18.0-rc1-scratch , < v1.17.0-scratch (other)
    cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*
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Credits
Aly (spect3r1) Abdelrahman Ahmed Aboelkasem (0x2face) Louis Pilfold Jonatan Männchen / EEF
Show details on NVD website

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\"Gleam\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.18.0-rc1\", \"lessThan\": \"1.17.0\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"ed7aec0484f10d60978b63788c8a6497590855ab\", \"lessThan\": \"690ca069817bee5f77a28fc3e360627c1da19291\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/gleam-lang/gleam\", \"packageName\": \"gleam-lang/gleam\", \"programFiles\": [\"compiler-cli/src/dependencies.rs\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"compiler_cli::dependencies::remove_extra_packages\"}, {\"name\": \"compiler_cli::dependencies::LocalPackages::read_from_disc\"}, {\"name\": \"compiler_cli::dependencies::LocalPackages::extra_local_packages\"}]}, {\"cpes\": [\"cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*\"], \"vendor\": \"Gleam\", \"modules\": [\"compiler-cli\"], \"product\": \"Gleam\", \"versions\": [{\"status\": \"affected\", \"version\": \"v0.18.0-rc1-elixir\", \"lessThan\": \"v1.17.0-elixir\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-erlang\", \"lessThan\": \"v1.17.0-erlang\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-node\", \"lessThan\": \"v1.17.0-node\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-node-slim\", \"lessThan\": \"v1.17.0-node-slim\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-elixir-slim\", \"lessThan\": \"v1.17.0-elixir-slim\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-erlang-slim\", \"lessThan\": \"v1.17.0-erlang-slim\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-erlang-alpine\", \"lessThan\": \"v1.17.0-erlang-alpine\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-elixir-alpine\", \"lessThan\": \"v1.17.0-elixir-alpine\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-node-alpine\", \"lessThan\": \"v1.17.0-node-alpine\", \"versionType\": \"other\"}, {\"status\": \"affected\", \"version\": \"v0.18.0-rc1-scratch\", \"lessThan\": \"v1.17.0-scratch\", \"versionType\": \"other\"}], \"packageURL\": \"pkg:oci/gleam?repository_url=ghcr.io/gleam-lang\", \"packageName\": \"gleam-lang/gleam\", \"programFiles\": [\"compiler-cli/src/dependencies.rs\"], \"collectionURL\": \"https://ghcr.io\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"compiler_cli::dependencies::remove_extra_packages\"}, {\"name\": \"compiler_cli::dependencies::LocalPackages::read_from_disc\"}, {\"name\": \"compiler_cli::dependencies::LocalPackages::extra_local_packages\"}]}], \"references\": [{\"url\": \"https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-43965.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-43965\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Path traversal vulnerability in Gleam\u0027s dependency management allows arbitrary directory deletion via malicious build/packages/packages.toml content.\\n\\nPackage keys read from build/packages/packages.toml by LocalPackages::read_from_disc are passed without validation to paths.build_packages_package(), which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to fs::delete_directory (which calls remove_dir_all). No check is performed to ensure the path remains within the intended build/packages/ directory. Both absolute paths and relative traversal sequences (e.g. ../) are accepted as package keys, allowing deletion of arbitrary directories.\\n\\nAn attacker who can cause a victim to run gleam deps download on a project containing a malicious build/packages/packages.toml (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim\u0027s system to be recursively deleted.\\n\\nThis issue affects Gleam from 0.18.0-rc1 until 1.17.0.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003ePath traversal vulnerability in Gleam\u0027s dependency management allows arbitrary directory deletion via malicious \u003ctt\u003ebuild/packages/packages.toml\u003c/tt\u003e content.\u003c/p\u003e\u003cp\u003ePackage keys read from \u003ctt\u003ebuild/packages/packages.toml\u003c/tt\u003e by \u003ctt\u003eLocalPackages::read_from_disc\u003c/tt\u003e are passed without validation to \u003ctt\u003epaths.build_packages_package()\u003c/tt\u003e, which constructs a filesystem path by joining the project build directory with the attacker-controlled key. The resulting path is then passed to \u003ctt\u003efs::delete_directory\u003c/tt\u003e (which calls \u003ctt\u003eremove_dir_all\u003c/tt\u003e). No check is performed to ensure the path remains within the intended \u003ctt\u003ebuild/packages/\u003c/tt\u003e directory. Both absolute paths and relative traversal sequences (e.g. \u003ctt\u003e../\u003c/tt\u003e) are accepted as package keys, allowing deletion of arbitrary directories.\u003c/p\u003e\u003cp\u003eAn attacker who can cause a victim to run \u003ctt\u003egleam deps download\u003c/tt\u003e on a project containing a malicious \u003ctt\u003ebuild/packages/packages.toml\u003c/tt\u003e (e.g. by committing the normally-gitignored file to a repository) can cause arbitrary directories on the victim\u0027s system to be recursively deleted.\u003c/p\u003e\u003cp\u003eThis issue affects Gleam from 0.18.0-rc1 until 1.17.0.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-22\", \"description\": \"CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.17.0\", \"versionStartIncluding\": \"0.18.0-rc1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-02T19:14:19.113Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43965\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-02T19:14:19.113Z\", \"dateReserved\": \"2026-05-04T18:23:25.573Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-02T13:41:37.421Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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