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{"cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-43965", "lastModified": "2026-06-02T16:16:40.897", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}, "published": "2026-06-02T14:16:54.053", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://cna.erlef.org/cves/CVE-2026-43965.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/gleam-lang/gleam/commit/690ca069817bee5f77a28fc3e360627c1da19291"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "url": "https://osv.dev/vulnerability/EEF-CVE-2026-43965"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/gleam-lang/gleam/security/advisories/GHSA-jqvf-f6p2-wrv3"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.18.0-rc1,1.17.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Gleam", "source": "cna", "vendor": "Gleam"}, "product": "gleam", "vendor": "gleam"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.18.0-rc1,1.17.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ed7aec0484f10d60978b63788c8a6497590855ab,690ca069817bee5f77a28fc3e360627c1da19291)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Gleam", "source": "cna", "vendor": "Gleam"}, "product": "gleam", "vendor": "gleam"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-elixir,v1.17.0-elixir)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-erlang,v1.17.0-erlang)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-node,v1.17.0-node)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-node-slim,v1.17.0-node-slim)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-elixir-slim,v1.17.0-elixir-slim)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-erlang-slim,v1.17.0-erlang-slim)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-erlang-alpine,v1.17.0-erlang-alpine)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-elixir-alpine,v1.17.0-elixir-alpine)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-node-alpine,v1.17.0-node-alpine)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[v0.18.0-rc1-scratch,v1.17.0-scratch)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Gleam", "source": "cna", "vendor": "Gleam"}, "product": "gleam", "vendor": "gleam"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "gleam", "vendor": "gleam-lang"}], "created": "2026-06-02T15:45:06.064596+00:00", "updated": "2026-06-02T15:45:06.389519+00:00", "vendors": ["gleam", "gleam$PRODUCT$gleam", "gleam-lang", "gleam-lang$PRODUCT$gleam"]}