{"id":"CVE-2026-47078","summary":"Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass","details":"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 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to stdlib from 6.1 before 8.0.3, 7.3.0.1 and 6.2.2.4.","aliases":["EEF-CVE-2026-47078","GHSA-rf72-wp7h-jg3x"],"modified":"2026-08-01T03:32:59.585827376Z","published":"2026-07-27T15:03:50.929Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-23"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47078.json","unresolved_ranges":[{"extracted_events":[{"introduced":"6.1"},{"fixed":"*"},{"introduced":"27.1"},{"fixed":"*"},{"introduced":"8d537f51a4262d24f3395c4148323eaca9facbbd"},{"fixed":"8a933c9c7835b06776d31d17b79b7336627d887a"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-47078.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-47078"},{"type":"WEB","url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47078.json"},{"type":"ADVISORY","url":"https://github.com/erlang/otp/security/advisories/GHSA-rf72-wp7h-jg3x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47078"},{"type":"FIX","url":"https://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887a"},{"type":"PACKAGE","url":"https://github.com/erlang/otp"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/erlang/otp","events":[{"introduced":"9ae2ef54fc6dacb5bfbe2dc6fc6f2522d57ce1fb"},{"introduced":"9e6f6742c4d9e9915ee8af0dcb7d97cf1f836116"},{"introduced":"550d7b7898706c7822362c42e7b93120c1d1f29a"},{"fixed":"8def54e66dfdd41c535272794d49cc633f596d22"},{"fixed":"6cfd400a2379163a2802f376d3b3d02f815d34c0"},{"fixed":"1259612946cb36a8bf9614b289090bb32fbcbeb2"},{"fixed":"8a933c9c7835b06776d31d17b79b7336627d887a"}],"database_specific":{"source":["CPE_FIELD","REFERENCES"],"extracted_events":[{"introduced":"27.1"},{"fixed":"27.3.4.15"},{"introduced":"28.0"},{"fixed":"28.5.0.4"},{"introduced":"29.0"},{"fixed":"29.0.4"}]}}],"versions":["OTP-29.0.3","OTP-28.5.0.3","OTP-27.3.4.14","patch-base-28","OTP-28.5","patch-base-27","OTP-27.3.4","OTP-27.3.4.13","OTP-28.5.0.2","OTP-29.0.2","OTP-28.4","OTP-27.3.4.12","OTP-28.5.0.1","OTP-29.0.1","OTP-29.0","OTP-27.3.4.9","OTP-27.3.4.11","OTP-27.3.4.10","OTP-28.0","OTP-27.3.4.8","OTP-27.3.4.6","OTP-27.3.4.7","OTP-27.3","OTP-27.3.4.5","OTP-27.3.4.4","OTP-28.1","OTP-27.3.4.3","OTP-27.3.3","OTP-27.3.4.2","OTP-27.3.4.1","OTP-27.3.2","OTP-27.2","OTP-27.3.1","OTP-27.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47078.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"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"}]}