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CVE-2026-48855— SFTP READLINK Leaks Absolute Backend Filesystem Path When Root Is Configured

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 ssh 3.0.1至6.0.1之前版本、5.5.2.1版本和5.2.11.8版本存在信息泄露漏洞，该漏洞源于ssh_sftpd模块中SSH_FXP_READLINK处理程序在发送file:read_link/2结果时未调用chroot_filename/2去除后端根前缀，可能导致已认证SFTP客户端获取绝对文件系统路径信息。

CVSS 2.3 · Low EPSS 0.30% · P21

Affected Version Matrix 4

VendorProduct Version RangeStatus
Erlang OTP 17.0< * affected
3.0.1< * affected
08225797f7ef943d0c82a1d9dd6650d94ca2580d< 8f4224a0d2676b0653d2c71a889a956e8c2c62d6 affected
8f4224a0d2676b0653d2c71a889a956e8c2c62d6< * unaffected
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I. Basic Information for CVE-2026-48855

Vulnerability Information
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Vulnerability Title
SFTP READLINK Leaks Absolute Backend Filesystem Path When Root Is Configured
Source: CVE Program / CVE List V5
Vulnerability Description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Erlang OTP ssh (ssh_sftpd module) allows File Discovery. The SSH_FXP_READLINK handler in ssh_sftpd sends the raw result of file:read_link/2 to the client without calling chroot_filename/2 to strip the backend root prefix. An authenticated SFTP client can create a symlink inside the chroot pointing to /; ssh_sftpd resolves the target to the absolute backend root and stores it on disk. Reading the symlink back via SSH_FXP_READLINK returns that absolute path, for example /data/sftp, instead of the chrooted value /. The information disclosed is the absolute filesystem path of the SFTP root directory and of any symlink targets within it. No file contents, credentials, or access to paths outside the root directory are obtainable through this issue alone. This vulnerability is associated with program files lib/ssh/src/ssh_sftpd.erl. This issue affects OTP from OTP 17.0 before OTP 27.3.4.13, OTP 28.5.0.2, and OTP 29.0.2, corresponding to ssh from 3.0.1 before 5.2.11.8, 5.5.2.1, and 6.0.1. Whether OTP before OTP 17.0, corresponding to ssh before 3.0.1, is affected is unknown.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Erlang/OTP 信息泄露漏洞
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 ssh 3.0.1至6.0.1之前版本、5.5.2.1版本和5.2.11.8版本存在信息泄露漏洞，该漏洞源于ssh_sftpd模块中SSH_FXP_READLINK处理程序在发送file:read_link/2结果时未调用chroot_filename/2去除后端根前缀，可能导致已认证SFTP客户端获取绝对文件系统路径信息。
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 17.0 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 3.0.1 ~ * cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Erlang OTP 08225797f7ef943d0c82a1d9dd6650d94ca2580d ~ 8f4224a0d2676b0653d2c71a889a956e8c2c62d6 cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-48855

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III. Intelligence Information for CVE-2026-48855

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Patches & Fixes for CVE-2026-48855 (1)

Vendor Advisories for CVE-2026-48855 (3)

Same Patch Batch · Erlang · 2026-06-10 · 7 CVEs total

CVE-2026-49759 8.8 HIGH Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crash
CVE-2026-48860 7.5 HIGH Distribution-over-TLS LAN allowlist silently bypassed due to sockname/peername confusion i
CVE-2026-48856 7.1 HIGH httpc leaks Authorization header to cross-origin redirect targets
CVE-2026-49760 6.9 MEDIUM Stack Buffer Overflow in ei_s_print_term at Very Large Integer
CVE-2026-48859 6.3 MEDIUM SSH server timing side-channel in ssh_auth:check_password/3 allows unauthenticated usernam
CVE-2026-48858 6.3 MEDIUM ftp client PASV response IP not validated against control peer, enabling SSRF and FTP boun

IV. Related Vulnerabilities

Same product: OTP
Same vendor: Erlang
Same weakness: CWE-200

V. Comments for CVE-2026-48855

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