CVE-2026-47078 - Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass

CVE-2026-47078 - Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass

https://cvefeed.io/rssfeed/latest.atom / Mon, 07/27/2026 - 19:07
CVE ID :CVE-2026-47078
Published : July 27, 2026, 4:17 p.m. | 34 minutes ago
Description :Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended extraction directory via a crafted zip archive. zip: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. This vulnerability is associated with program file lib/stdlib/src/zip.erl. This 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.
Severity: 4.8 | MEDIUM
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