CVE-2026-47078
Publication date 27 July 2026
Last updated 8 October 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| erlang | 26.04 LTS resolute |
Fixed 1:27.3.4.6+dfsg-1ubuntu0.2
|
| 24.04 LTS noble |
Fixed 1:25.3.2.8+dfsg-1ubuntu4.8
|
|
| 22.04 LTS jammy |
Fixed 1:24.2.1+dfsg-1ubuntu0.8
|
|
| 20.04 LTS focal |
Fixed 1:22.2.7+dfsg-1ubuntu0.5+esm3
|
|
| 18.04 LTS bionic |
Fixed 1:20.2.2+dfsg-1ubuntu2+esm4
|
|
| 16.04 LTS xenial | Ignored changes too intrusive | |
| 14.04 LTS trusty | Ignored changes too intrusive |
Get expanded security coverage with Ubuntu Pro
Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.
Get Ubuntu Pro 30-day free trialSeverity score breakdown
CVSS version: CVSS v4.0
Base score
4.8 · Medium
Vector: 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