| Name | CVE-2026-47078 |
| 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| erlang (PTS) | bullseye | 1:23.2.6+dfsg-1+deb11u1 | vulnerable |
| bullseye (security) | 1:23.2.6+dfsg-1+deb11u4 | vulnerable | |
| bookworm | 1:25.2.3+dfsg-1+deb12u4 | vulnerable | |
| bookworm (security) | 1:25.2.3+dfsg-1+deb12u1 | vulnerable | |
| trixie | 1:27.3.4.1+dfsg-1+deb13u2 | vulnerable | |
| forky, sid | 1:29.0.3+dfsg-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| erlang | source | (unstable) | (unfixed) |
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
Introduced with: https://github.com/erlang/otp/commit/8d537f51a4262d24f3395c4148323eaca9facbbd (OTP-27.1)
Fixed by: https://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887a (OTP-29.0.4, OTP-28.5.0.4, OTP-27.3.4.15)