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 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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Erlang OTP
Default version status: unaffected
27.1 to < *affected
pkg:software-id/erlang.org/otpErlang OTP
Default version status: unaffected
6.1 to < *affected
pkg:otp/stdlib?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.gitErlang OTP
Default version status: unaffected
8d537f51a4262d24f3395c4148323eaca9facbbd to < 8a933c9c7835b06776d31d17b79b7336627d887aaffected
pkg:github/erlang/otpReferences
- https://github.com/erlang/otp/security/advisories/GHSA-rf72-wp7h-jg3x ↗
- https://cna.erlef.org/cves/CVE-2026-47078.html ↗
- https://osv.dev/vulnerability/EEF-CVE-2026-47078 ↗
- https://www.erlang.org/doc/system/versions.html#order-of-versions ↗
- https://github.com/erlang/otp/commit/8d537f51a4262d24f3395c4148323eaca9facbbd ↗
- https://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887a ↗