CVE-2026-47078
published 2026-07-27CVE-2026-47078: Relative Path Traversal vulnerability in Erlang OTP (stdlib zip module) allows writing files outside the intended extraction directory via a crafted zip…
PriorityP423medium4.8CVSS 4.0
AVLACLATNPRNUIPVCNVILVALSCNSILSALEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.15%
3.8th percentile
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
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| erlang | otp | >= 27.1 < * | * |
| erlang | otp | >= 6.1 < * | * |
| erlang | otp | >= 8d537f51a4262d24f3395c4148323eaca9facbbd < 8a933c9c7835b06776d31d17b79b7336627d887a | 8a933c9c7835b06776d31d17b79b7336627d887a |
CVSS provenance
nvdv4.04.8MEDIUMCVSS: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
vendor_redhat4.8MEDIUM
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VulDB
Erlang OTP stdlib zip module lib/stdlib/src/zip.erl zip:unzip/1/2/zip:extract/1/2 path traversal
vuldb·2026-09-24·CVSS 4.8
CVE-2026-47078 [MEDIUM] Erlang OTP stdlib zip module lib/stdlib/src/zip.erl zip:unzip/1/2/zip:extract/1/2 path traversal
A vulnerability marked as critical has been reported in Erlang OTP. Affected by this vulnerability is the function zip:unzip/1/2/zip:extract/1/2 of the file lib/stdlib/src/zip.erl of the component stdlib zip module. The manipulation leads to path traversal.
This vulnerability is documented as CVE-2026-47078. The attack can be initiated remotely. There is not any exploit available.
Red Hat
otp: Erlang OTP: Arbitrary file write via relative path traversal in zip module
vendor_redhat·2026-07-27·CVSS 4.8
CVE-2026-47078 [MEDIUM] CWE-22 otp: Erlang OTP: Arbitrary file write via relative path traversal in zip module
otp: Erlang OTP: Arbitrary file write via relative path traversal in zip module
A flaw was found in the Erlang OTP stdlib zip module. The zip:unzip and zip:extract functions, which handle archive extraction, are vulnerable to a relative path traversal attack. A remote attacker could craft a malicious zip archive containing specially formed entry names. When processed, this could allow the attacker to write arbitrary files outside the intended extraction directory, potentially leading to remote code execution or data corruption.
Package: erlang27 (Red Hat Hardened Images) - Not affected
Package: erlang (Red Hat OpenStack Platform 16.2) - Not affected
Package: erlang (Red Hat OpenStack Platform 17.1) - Not affected
Package: erlang (Red Hat OpenStack Platform 18.0) - Not affected
No detection rules found.
No public exploits indexed.
https://cna.erlef.org/cves/CVE-2026-47078.htmlhttps://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887ahttps://github.com/erlang/otp/commit/8d537f51a4262d24f3395c4148323eaca9facbbdhttps://github.com/erlang/otp/security/advisories/GHSA-rf72-wp7h-jg3xhttps://osv.dev/vulnerability/EEF-CVE-2026-47078https://www.erlang.org/doc/system/versions.html#order-of-versions
2026-07-27
Published