CVE-2026-47078

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.

CVSS

No CVSS.

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-47078.html
https://github.com/erlang/otp/commit/8a933c9c7835b06776d31d17b79b7336627d887a
https://github.com/erlang/otp/security/advisories/GHSA-rf72-wp7h-jg3x
https://osv.dev/vulnerability/EEF-CVE-2026-47078
https://www.erlang.org/doc/system/versions.html#order-of-versions

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-27 16:17

Updated : 2026-07-30 17:01

NVD link : CVE-2026-47078

Mitre link : CVE-2026-47078

CVE.ORG link : CVE-2026-47078

JSON object : View

Products Affected

No product.

CWE

CWE-23

Relative Path Traversal

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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.\n\nThis vulnerability is associated with program file lib/stdlib/src/zip.erl.\n\nThis issue affects OTP from OTP 27.1 before OTP\u00a029.0.4, OTP\u00a028.5.0.4 and OTP\u00a027.3.4.15, corresponding to stdlib from 6.1 before 8.0.3, 7.3.0.1 and 6.2.2.4."}], "lastModified": "2026-07-30T17:01:07.343", "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db"}