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  4. CVE 2026 48855 sftp readlink leaks absolute backend filesystem
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Back to active CVEs
Low · CVSS 2.3CVE-2026-48855

SFTP READLINK Leaks Absolute Backend Filesystem Path When Root Is ConfiguredCVE-2026-48855

Answer in brief

CVE-2026-48855 records a Low severity (CVSS 2.3) vulnerability in SFTP READLINK Leaks Absolute Backend Filesystem Path When Root Is Configured. The current sources do not mark it as known exploited. The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 10, 2026Updated Oct 25, 2026Source checked Nov 9, 2026First seen by HOL Sep 25, 2026Material review Oct 25, 2026
Upstream Advisory

Record context

Vulnerability class
Arbitrary File Read
EPSS
Not reported
CWE IDs
CWE-200
Source
CVE List V5
Source checked
Nov 9, 2026
References
6 linked sources
Open source record

Key facts

Risk
Low · CVSS 2.3
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 2.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:a:erlang:erlang\/ssh:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Erlang/erlang/otpgeneric>=08225797f7ef943d0c82a1d9dd6650d94ca2580d <8f4224a0d2676b0653d2c71a889a956e8c2c62d68f4224a0d2676b0653d2c71a889a956e8c2c62d6
Erlang/OTPgeneric>=17.0 <**
Erlang/OTPgeneric>=3.0.1 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Erlang/erlang/otp, Erlang/OTP, Erlang/OTP.
  2. 2Review the reported fix. Source-reported workaround: * Use OS-level chroot to run the Erlang VM/SFTP server process in an isolated filesystem environment, eliminating reliance on the application-level root option. * Ensure that the SFTP server port is not reachable from untrusted machines. * Ensure that no sensitive information (usernames, project names, mount topology) is inferrable from the absolute path of the configured root directory.

Evidence timeline and material changes

  1. Published upstream

    Jun 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 25, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
  • Source referenceerlang.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.