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CVE-2026-47078— Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass

Quick assessment

Affected
Erlang OTP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Erlang OTP是瑞典Erlang社区的一套构建分布式系统的中间件平台。 Erlang OTP 27.1版本和6.1版本存在路径遍历漏洞，该漏洞源于stdlib zip模块中的相对路径遍历问题，允许通过特制zip归档文件将文件写入预期解压目录之外。

CVSS 4.8 · Medium EPSS 0.15% · P4

Affected Version Matrix 3

VendorProduct Version RangeStatus
Erlang OTP 27.1< * affected
6.1< * affected
8d537f51a4262d24f3395c4148323eaca9facbbd< 8a933c9c7835b06776d31d17b79b7336627d887a affected
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I. Basic Information for CVE-2026-47078

Vulnerability Information
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Vulnerability Title
Relative path traversal in zip:unzip/zip:extract via check_dir_level depth-counter bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang OTP 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang OTP是瑞典Erlang社区的一套构建分布式系统的中间件平台。 Erlang OTP 27.1版本和6.1版本存在路径遍历漏洞，该漏洞源于stdlib zip模块中的相对路径遍历问题，允许通过特制zip归档文件将文件写入预期解压目录之外。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Erlang OTP 27.1 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 6.1 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 8d537f51a4262d24f3395c4148323eaca9facbbd ~ 8a933c9c7835b06776d31d17b79b7336627d887a cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47078

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III. Intelligence Information for CVE-2026-47078

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Patches & Fixes for CVE-2026-47078 (2)

Vendor Advisories for CVE-2026-47078 (3)

Same Patch Batch · Erlang · 2026-07-27 · 8 CVEs total

CVE-2026-55953 9.1 CRITICAL TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authent
CVE-2026-58227 8.7 HIGH TLS/DTLS denial of service via unbounded recursion on cross-signed peer certificate chain
CVE-2026-59251 8.7 HIGH Denial of service via exponential certificate policy tree growth in path validation
CVE-2026-59250 8.3 HIGH Megaco flex scanner buffer overflow via oversized property parm name
CVE-2026-54890 8.2 HIGH BEAM VM crash via integer underflow in binary_to_term BIT_BINARY_EXT decoding
CVE-2026-42792 6.3 MEDIUM epmd permanent DoS via EMFILE on accept(2) in erts
CVE-2026-55737 5.1 MEDIUM Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts e

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-23

V. Comments for CVE-2026-47078

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