{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43965", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-05-04T18:23:25.573Z", "datePublished": "2026-06-02T13:41:37.421Z", "dateUpdated": "2026-06-02T19:14:19.113Z" }, "containers": { "cna": { "affected": [ { "cpes": [ "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "compiler-cli" ], "packageName": "gleam", "packageURL": "pkg:sid/gleam.run/gleam", "product": "Gleam", "programFiles": [ "compiler-cli/src/dependencies.rs" ], "programRoutines": [ { "name": "compiler_cli::dependencies::remove_extra_packages" }, { "name": "compiler_cli::dependencies::LocalPackages::read_from_disc" }, { "name": "compiler_cli::dependencies::LocalPackages::extra_local_packages" } ], "vendor": "Gleam", "versions": [ { "lessThan": "1.17.0", "status": "affected", "version": "0.18.0-rc1", "versionType": "semver" } ] }, { "collectionURL": "https://github.com", "cpes": [ "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "compiler-cli" ], "packageName": "gleam-lang/gleam", "packageURL": "pkg:github/gleam-lang/gleam", "product": "Gleam", "programFiles": [ "compiler-cli/src/dependencies.rs" ], "programRoutines": [ { "name": "compiler_cli::dependencies::remove_extra_packages" }, { "name": "compiler_cli::dependencies::LocalPackages::read_from_disc" }, { "name": "compiler_cli::dependencies::LocalPackages::extra_local_packages" } ], "repo": "https://github.com/gleam-lang/gleam", "vendor": "Gleam", "versions": [ { "lessThan": "1.17.0", "status": "affected", "version": "0.18.0-rc1", "versionType": "semver" }, { "lessThan": "690ca069817bee5f77a28fc3e360627c1da19291", "status": "affected", "version": "ed7aec0484f10d60978b63788c8a6497590855ab", "versionType": "git" } ] }, { "collectionURL": "https://ghcr.io", "cpes": [ "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "modules": [ "compiler-cli" ], "packageName": "gleam-lang/gleam", "packageURL": "pkg:oci/gleam?repository_url=ghcr.io/gleam-lang", "product": "Gleam", "programFiles": [ "compiler-cli/src/dependencies.rs" ], "programRoutines": [ { "name": "compiler_cli::dependencies::remove_extra_packages" }, { "name": "compiler_cli::dependencies::LocalPackages::read_from_disc" }, { "name": "compiler_cli::dependencies::LocalPackages::extra_local_packages" } ], "vendor": "Gleam", "versions": [ { "lessThan": "v1.17.0-elixir", "status": "affected", "version": "v0.18.0-rc1-elixir", "versionType": "other" }, { "lessThan": "v1.17.0-erlang", "status": "affected", "version": "v0.18.0-rc1-erlang", "versionType": "other" }, { "lessThan": "v1.17.0-node", "status": "affected", "version": "v0.18.0-rc1-node", "versionType": "other" }, { "lessThan": "v1.17.0-node-slim", "status": "affected", "version": "v0.18.0-rc1-node-slim", "versionType": "other" }, { "lessThan": "v1.17.0-elixir-slim", "status": "affected", "version": "v0.18.0-rc1-elixir-slim", "versionType": "other" }, { "lessThan": "v1.17.0-erlang-slim", "status": "affected", "version": "v0.18.0-rc1-erlang-slim", "versionType": "other" }, { "lessThan": "v1.17.0-erlang-alpine", "status": "affected", "version": "v0.18.0-rc1-erlang-alpine", "versionType": "other" }, { "lessThan": "v1.17.0-elixir-alpine", "status": "affected", "version": "v0.18.0-rc1-elixir-alpine", "versionType": "other" }, { "lessThan": "v1.17.0-node-alpine", "status": "affected", "version": "v0.18.0-rc1-node-alpine", "versionType": "other" }, { "lessThan": "v1.17.0-scratch", "status": "affected", "version": "v0.18.0-rc1-scratch", "versionType": "other" } ] } ], "cpeApplicability": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:gleam-lang:gleam:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.17.0", "versionStartIncluding": "0.18.0-rc1", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "credits": [ { "lang": "en", "type": "finder", "value": "Aly (spect3r1)" }, { "lang": "en", "type": "finder", "value": "Abdelrahman Ahmed Aboelkasem (0x2face)" }, { "lang": "en", "type": "remediation developer", "value": "Louis Pilfold" }, { "lang": "en", "type": "analyst", "value": "Jonatan Männchen / EEF" } ], "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "

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.

" } ], "value": "Path traversal vulnerability in Gleam's 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's system to be recursively deleted.\n\nThis issue affects Gleam from 0.18.0-rc1 until 1.17.0." } ], "impacts": [ { "capecId": "CAPEC-139", "descriptions": [ { "lang": "en", "value": "CAPEC-139 Relative Path Traversal" } ] }, { "capecId": "CAPEC-597", "descriptions": [ { "lang": "en", "value": "CAPEC-597 Absolute Path Traversal" } ] } ], "metrics": [ { "cvssV4_0": { "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "baseScore": 5.6, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-22", "description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-06-02T19:14:19.113Z" }, "references": [ { "tags": [ "vendor-advisory", "related" ], "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3" }, { "tags": [ "related" ], "url": "https://cna.erlef.org/cves/CVE-2026-43965.html" }, { "tags": [ "related" ], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-43965" }, { "tags": [ "patch" ], "url": "https://github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291" } ], "source": { "discovery": "EXTERNAL" }, "title": "Path Traversal in build/packages/packages.toml Allows Arbitrary Directory Deletion", "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "references": [ { "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3", "tags": [ "exploit" ] } ], "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-02T15:07:44.667204Z", "id": "CVE-2026-43965", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-02T15:08:13.970Z" } } ] } }