CVE-2026-23942

MEDIUM EPSS 28.2%
Published Mar 13, 20263mo ago · Modified May 21, 20261mo ago
5.3 CVSS 4.0
Medium
Find Similar
Published Mar 13, 2026 3mo ago
Last Modified May 21, 2026 1mo ago

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 until OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to ssh from 3.0.1 until 5.5.1, 5.2.11.6 and 5.1.4.14.

CVSS Details

Base Score
5.3
Exploitability
—
Impact
—
Vector string
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/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
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
28.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-22 Path Traversal Resource Mgmt

Affected Products 6

VendorProductVersionRange
erlangerlang\/otp*≥17.0  –  <26.2.5.18
erlangerlang\/otp*≥27.0  –  <27.3.4.9
erlangerlang\/otp*≥28.0  –  <28.4.1
erlangerlang\/ssh*≥3.0.1  –  <5.1.4.14
erlangerlang\/ssh*≥5.2  –  <5.2.11.6
erlangerlang\/ssh*≥5.5  –  ≤5.5.1

References 7

  • cna.erlef.org https://cna.erlef.org/cves/CVE-2026-23942.html
    Vendor Advisory
  • github.com https://github.com/erlang/otp/commit/27688a824f753d4c16371dc70e88753fb410590b
    Patch
  • github.com https://github.com/erlang/otp/commit/5ed603a1211b83b8be2d1fc06d3f3bf30c3c9759
    Patch
  • github.com https://github.com/erlang/otp/commit/9e0ac85d3485e7898e0da88a14be0ee2310a3b28
    Patch
  • github.com https://github.com/erlang/otp/security/advisories/GHSA-4749-w85x-hw9h
    MitigationVendor Advisory
  • osv.dev https://osv.dev/vulnerability/EEF-CVE-2026-23942
    Vendor Advisory
  • erlang.org https://www.erlang.org/doc/system/versions.html#order-of-versions
    Product

Remediation

  • github.com https://github.com/erlang/otp/commit/27688a824f753d4c16371dc70e88753fb410590b
    Patch
  • github.com https://github.com/erlang/otp/commit/5ed603a1211b83b8be2d1fc06d3f3bf30c3c9759
    Patch
  • github.com https://github.com/erlang/otp/commit/9e0ac85d3485e7898e0da88a14be0ee2310a3b28
    Patch