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CVE-2026-23942— SFTP root escape via component-agnostic prefix check in ssh_sftpd

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Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 17.0至28.4.1版本、27.3.4.9版本和26.2.5.18版本存在安全漏洞，该漏洞源于路径名限制不当，可能导致路径遍历攻击。

CVSS 5.3 · Medium EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 3

VendorProduct Version RangeStatus
Erlang OTP 3.0.1< * affected
17.0< * affected
84adefa331c4159d432d22840663c38f155cd4c1< * affected
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I. Basic Information for CVE-2026-23942

Vulnerability Information
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Vulnerability Title
SFTP root escape via component-agnostic prefix check in ssh_sftpd
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Erlang OTP (ssh_sftpd module) allows Path Traversal. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl and program routines ssh_sftpd:is_within_root/2. The SFTP server uses string prefix matching via lists:prefix/2 rather than proper path component validation when checking if a path is within the configured root directory. This allows authenticated users to access sibling directories that share a common name prefix with the configured root directory. For example, if root is set to /home/user1, paths like /home/user10 or /home/user1_backup would incorrectly be considered within the root. This issue affects OTP from OTP 17.0 before OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to ssh from 3.0.1 before 5.5.1, 5.2.11.6 and 5.1.4.14.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Erlang/OTP是Erlang/OTP开源的一个JavaScript编写的处理处理异常的库。该库可以捕捉node.js内置API引发的异常。 Erlang/OTP 17.0至28.4.1版本、27.3.4.9版本和26.2.5.18版本存在安全漏洞，该漏洞源于路径名限制不当，可能导致路径遍历攻击。
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 3.0.1 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 17.0 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-23942

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III. Intelligence Information for CVE-2026-23942

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Patches & Fixes for CVE-2026-23942 (3)

Vendor Advisories for CVE-2026-23942 (3)

Same Patch Batch · Erlang · 2026-03-13 · 3 CVEs total

CVE-2026-23941 7.0 HIGH Request smuggling via first-wins Content-Length parsing in inets httpd
CVE-2026-23943 6.9 MEDIUM Pre-auth SSH DoS via unbounded zlib inflate

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-22

V. Comments for CVE-2026-23942

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