4.8

CVE-2026-47078

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

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerErlang
≫
Produkt OTP
Default Statusunaffected
Version 27.1
Version < *
Status affected
HerstellerErlang
≫
Produkt OTP
Default Statusunaffected
Version 6.1
Version < *
Status affected
HerstellerErlang
≫
Produkt OTP
Default Statusunaffected
Version 8d537f51a4262d24f3395c4148323eaca9facbbd
Version < 8a933c9c7835b06776d31d17b79b7336627d887a
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.048
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
6b3ad84c-e1a6-4bf7-a703-f496b71e49db 4.8 0 0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-23 Relative Path Traversal

The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

https://www.erlang.org/doc/system/versions.html#order-of-versions
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://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887a
https://github.com/erlang/otp/commit/8d537f51a4262d24f3395c4148323eaca9facbbd