{"cvss":4.8,"datePublished":"2026-07-27T16:17:07.643","dateUpdated":"2026-10-24T13:10:00.147","description":"Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended extraction directory via a crafted zip archive.\n\nzip:unzip/1,2 and zip:extract/1,2 validate entry paths using zip:check_dir_level/2, which tracks directory depth as a running integer counter: .. decrements it, normal path components increment it. The caller rejects only paths where the final counter value is less than zero. A path such as ../x/y causes the counter to go negative mid-traversal then recover to zero, passing validation while resolving to a location outside the extraction directory when joined with the current working directory via add_cwd.\n\nThis vulnerability is associated with program file lib/stdlib/src/zip.erl.\n\nThis issue affects OTP from OTP 27.1 before OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4, corresponding to stdlib from 6.1 before 6.2.2.4, 7.3.0.1, and 8.0.3.","id":"CVE-2026-47078","raw":{"affected":[{"affectedData":[{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["zip"],"packageName":"otp","packageURL":"pkg:software-id/erlang.org/otp","product":"OTP","programFiles":["lib/stdlib/src/zip.erl"],"programRoutines":[{"name":"zip:unzip/1"},{"name":"zip:unzip/2"},{"name":"zip:extract/1"},{"name":"zip:extract/2"},{"name":"zip:check_dir_level/2"}],"vendor":"Erlang","versions":[{"changes":[{"at":"27.3.4.15","status":"unaffected"},{"at":"28.5.0.4","status":"unaffected"},{"at":"29.0.4","status":"unaffected"}],"lessThan":"*","status":"affected","version":"27.1","versionType":"otp"}]},{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["zip"],"packageName":"stdlib","packageURL":"pkg:otp/stdlib?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/zip.erl"],"programRoutines":[{"name":"zip:unzip/1"},{"name":"zip:unzip/2"},{"name":"zip:extract/1"},{"name":"zip:extract/2"},{"name":"zip:check_dir_level/2"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"6.2.2.4","status":"unaffected"},{"at":"7.3.0.1","status":"unaffected"},{"at":"8.0.3","status":"unaffected"}],"lessThan":"*","status":"affected","version":"6.1","versionType":"otp"}]},{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["zip"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/stdlib/src/zip.erl"],"programRoutines":[{"name":"zip:unzip/1"},{"name":"zip:unzip/2"},{"name":"zip:extract/1"},{"name":"zip:extract/2"},{"name":"zip:check_dir_level/2"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"lessThan":"8a933c9c7835b06776d31d17b79b7336627d887a","status":"affected","version":"8d537f51a4262d24f3395c4148323eaca9facbbd","versionType":"git"}]}],"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}],"cveTags":[],"descriptions":[{"lang":"en","value":"Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended extraction directory via a crafted zip archive.\n\nzip:unzip/1,2 and zip:extract/1,2 validate entry paths using zip:check_dir_level/2, which tracks directory depth as a running integer counter: .. decrements it, normal path components increment it. The caller rejects only paths where the final counter value is less than zero. A path such as ../x/y causes the counter to go negative mid-traversal then recover to zero, passing validation while resolving to a location outside the extraction directory when joined with the current working directory via add_cwd.\n\nThis vulnerability is associated with program file lib/stdlib/src/zip.erl.\n\nThis issue affects OTP from OTP 27.1 before OTP 27.3.4.15, OTP 28.5.0.4, and OTP 29.0.4, corresponding to stdlib from 6.1 before 6.2.2.4, 7.3.0.1, and 8.0.3."},{"lang":"es","value":"Vulnerabilidad de salto de ruta relativo en Erlang OTP (módulo zip de stdlib) permite escribir archivos fuera del directorio de extracción previsto mediante un archivo zip manipulado.\n\nzip:unzip/1,2 y zip:extract/1,2 validan las rutas de entrada usando zip:check_dir_level/2, que rastrea la profundidad del directorio como un contador entero en ejecución: .. lo decrementa, los componentes de ruta normales lo incrementan. El llamador rechaza solo las rutas donde el valor final del contador es menor que cero. Una ruta como .. / x/y hace que el contador se vuelva negativo a mitad del recorrido y luego se recupere a cero, pasando la validación mientras se resuelve a una ubicación fuera del directorio de extracción cuando se une con el directorio de trabajo actual a través de add_cwd.\n\nEsta vulnerabilidad está asociada con el archivo de programa lib/stdlib/src/zip.erl.\n\nEste problema afecta a OTP desde OTP 27.1 antes de OTP 29.0.4, OTP 28.5.0.4 y OTP 27.3.4.15, correspondiendo a stdlib desde 6.1 antes de 8.0.3, 7.3.0.1 y 6.2.2.4."}],"id":"CVE-2026-47078","lastModified":"2026-10-24T13:10:00.147","metrics":{"cvssMetricV40":[{"cvssData":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","availabilityRequirement":"NOT_DEFINED","baseScore":4.8,"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":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L/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":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","type":"Secondary"}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"id":"CVE-2026-47078","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-07-27T18:38:46.508080Z","version":"2.0.3"}}]},"published":"2026-07-27T16:17:07.643","references":[{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","url":"https://cna.erlef.org/cves/CVE-2026-47078.html"},{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","url":"https://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887a"},{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","url":"https://github.com/erlang/otp/commit/8d537f51a4262d24f3395c4148323eaca9facbbd"},{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","url":"https://github.com/erlang/otp/security/advisories/GHSA-rf72-wp7h-jg3x"},{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","url":"https://osv.dev/vulnerability/EEF-CVE-2026-47078"},{"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"}],"sourceIdentifier":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","vulnStatus":"Awaiting Analysis","weaknesses":[{"description":[{"lang":"en","value":"CWE-23"}],"source":"6b3ad84c-e1a6-4bf7-a703-f496b71e49db","type":"Secondary"}]},"severity":"MEDIUM","source":"nvd","title":"Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended ext..."}