Observable Response Discrepancy in Erlang OTP - CVE-2026-53422

Vulnerability identifier: #VU136828

CSH Severity: Low

CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-53422

CWE-ID: CWE-204

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to disclose sensitive information about filesystem path existence.

The vulnerability exists due to observable response discrepancy in the ssh_sftpd SSH_FXP_REALPATH handler when processing a crafted traversal path in a REALPATH request. A remote user can send a specially crafted REALPATH request to disclose sensitive information about filesystem path existence.

The issue affects deployments that rely on the configured root option for filesystem path isolation, and it does not by itself provide file contents disclosure or write access.

Erlang OTP
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
Server Applications Module
openSUSE Leap
openEuler
erlang-edoc
erlang-inets
erlang-hipe
erlang-ftp
erlang-examples
erlang-eunit
erlang-et
erlang-erts
erlang-erl_interface
erlang-erl_docgen
erlang-eldap
erlang-jinterface
erlang-diameter
erlang-dialyzer
erlang-debugsource
erlang-debuginfo
erlang-debugger
erlang-crypto
erlang-compiler
erlang-common_test
erlang-asn1
erlang
erlang-runtime_tools
erlang-xmerl
erlang-wx
erlang-tools
erlang-tftp
erlang-syntax_tools
erlang-stdlib
erlang-ssl
erlang-ssh
erlang-snmp
erlang-sasl
erlang-reltool
erlang-public_key
erlang-parsetools
erlang-os_mon
erlang-odbc
erlang-observer
erlang-mnesia
erlang-megaco
erlang-kernel
erlang-dialyzer-debuginfo
erlang-epmd
erlang-wx-debuginfo
erlang-debugger-src
erlang-et-src
erlang-reltool-src
erlang-jinterface-src
erlang-diameter-src
erlang-doc
erlang-src
erlang-observer-src
erlang-epmd-debuginfo
erlang-dialyzer-src
erlang-wx-src
erlang26-debugger
erlang26-jinterface-src
erlang26-epmd
erlang26-jinterface
erlang26-wx-src
erlang26-dialyzer-src
erlang26-diameter-src
erlang26-wx
erlang26-et
erlang26-reltool-src
erlang26-reltool
erlang26-debugger-src
erlang26-dialyzer-debuginfo
erlang26-epmd-debuginfo
erlang26-debugsource
erlang26-et-src
erlang26
erlang26-dialyzer
erlang26-observer
erlang26-debuginfo
erlang26-src
erlang26-observer-src
erlang26-wx-debuginfo
erlang26-diameter
erlang26-doc
erlang27-src
erlang27-dialyzer-debuginfo
erlang27-reltool-src
erlang27-dialyzer
erlang27-debuginfo
erlang27-diameter-src
erlang27-epmd
erlang27
erlang27-dialyzer-src
erlang27-debugsource
erlang27-reltool
erlang27-jinterface-src
erlang27-jinterface
erlang27-epmd-debuginfo
erlang27-diameter
erlang (Debian package)

Install security update from vendor's website.

Erlang OTP - addressed in versions 27.3.4.14, 28.5.0.3, 29.0.3
erlang-edoc - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-inets - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-hipe - update to 23.3.4.9-11
erlang-ftp - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-examples - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-eunit - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-et - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-erts - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-erl_interface - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-erl_docgen - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-eldap - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-jinterface - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-diameter - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-dialyzer - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-debugsource - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-debuginfo - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-debugger - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-crypto - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-compiler - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-common_test - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-asn1 - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-runtime_tools - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-xmerl - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-wx - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-tools - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-tftp - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-syntax_tools - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-stdlib - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-ssl - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-ssh - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-snmp - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-sasl - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-reltool - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-public_key - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-parsetools - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-os_mon - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-odbc - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-observer - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-mnesia - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-megaco - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-kernel - addressed in versions 23.3.4.9-11, 25.3.2.6-18
erlang-wx - update to 23.3.4.19-150300.3.39.1
erlang-dialyzer-debuginfo - update to 23.3.4.19-150300.3.39.1
erlang - update to 23.3.4.19-150300.3.39.1
erlang-epmd - update to 23.3.4.19-150300.3.39.1
erlang-debuginfo - update to 23.3.4.19-150300.3.39.1
erlang-dialyzer - update to 23.3.4.19-150300.3.39.1
erlang-wx-debuginfo - update to 23.3.4.19-150300.3.39.1
erlang-debugger-src - update to 23.3.4.19-150300.3.39.1
erlang-diameter - update to 23.3.4.19-150300.3.39.1
erlang-et-src - update to 23.3.4.19-150300.3.39.1
erlang-debugsource - update to 23.3.4.19-150300.3.39.1
erlang-et - update to 23.3.4.19-150300.3.39.1
erlang-reltool - update to 23.3.4.19-150300.3.39.1
erlang-reltool-src - update to 23.3.4.19-150300.3.39.1
erlang-jinterface-src - update to 23.3.4.19-150300.3.39.1
erlang-diameter-src - update to 23.3.4.19-150300.3.39.1
erlang-doc - update to 23.3.4.19-150300.3.39.1
erlang-src - update to 23.3.4.19-150300.3.39.1
erlang-observer-src - update to 23.3.4.19-150300.3.39.1
erlang-epmd-debuginfo - update to 23.3.4.19-150300.3.39.1
erlang-jinterface - update to 23.3.4.19-150300.3.39.1
erlang-dialyzer-src - update to 23.3.4.19-150300.3.39.1
erlang-wx-src - update to 23.3.4.19-150300.3.39.1
erlang-debugger - update to 23.3.4.19-150300.3.39.1
erlang-observer - update to 23.3.4.19-150300.3.39.1
erlang-src - update to 25.3.2.6-18
erlang26-debugger - update to 26.2.1-150300.7.28.1
erlang26-jinterface-src - update to 26.2.1-150300.7.28.1
erlang26-epmd - update to 26.2.1-150300.7.28.1
erlang26-jinterface - update to 26.2.1-150300.7.28.1
erlang26-wx-src - update to 26.2.1-150300.7.28.1
erlang26-dialyzer-src - update to 26.2.1-150300.7.28.1
erlang26-diameter-src - update to 26.2.1-150300.7.28.1
erlang26-wx - update to 26.2.1-150300.7.28.1
erlang26-et - update to 26.2.1-150300.7.28.1
erlang26-reltool-src - update to 26.2.1-150300.7.28.1
erlang26-reltool - update to 26.2.1-150300.7.28.1
erlang26-debugger-src - update to 26.2.1-150300.7.28.1
erlang26-dialyzer-debuginfo - update to 26.2.1-150300.7.28.1
erlang26-epmd-debuginfo - update to 26.2.1-150300.7.28.1
erlang26-debugsource - update to 26.2.1-150300.7.28.1
erlang26-et-src - update to 26.2.1-150300.7.28.1
erlang26 - update to 26.2.1-150300.7.28.1
erlang26-dialyzer - update to 26.2.1-150300.7.28.1
erlang26-observer - update to 26.2.1-150300.7.28.1
erlang26-debuginfo - update to 26.2.1-150300.7.28.1
erlang26-src - update to 26.2.1-150300.7.28.1
erlang26-observer-src - update to 26.2.1-150300.7.28.1
erlang26-wx-debuginfo - update to 26.2.1-150300.7.28.1
erlang26-diameter - update to 26.2.1-150300.7.28.1
erlang26-doc - update to 26.2.1-150300.7.28.1
erlang27-src - update to 27.1.3-150300.7.7.1
erlang27-dialyzer-debuginfo - update to 27.1.3-150300.7.7.1
erlang27-reltool-src - update to 27.1.3-150300.7.7.1
erlang27-dialyzer - update to 27.1.3-150300.7.7.1
erlang27-debuginfo - update to 27.1.3-150300.7.7.1
erlang27-diameter-src - update to 27.1.3-150300.7.7.1
erlang27-epmd - update to 27.1.3-150300.7.7.1
erlang27 - update to 27.1.3-150300.7.7.1
erlang27-dialyzer-src - update to 27.1.3-150300.7.7.1
erlang27-debugsource - update to 27.1.3-150300.7.7.1
erlang27-reltool - update to 27.1.3-150300.7.7.1
erlang27-jinterface-src - update to 27.1.3-150300.7.7.1
erlang27-jinterface - update to 27.1.3-150300.7.7.1
erlang27-epmd-debuginfo - update to 27.1.3-150300.7.7.1
erlang27-diameter - update to 27.1.3-150300.7.7.1
erlang (Debian package) - update to 1:27.3.4.1+dfsg-1+deb13u3

• https://github.com/erlang/otp/security/advisories/GHSA-h9pw-h5w4-h976

• Multiple vulnerabilities in otp
• openEuler 24.03 LTS SP1 update for erlang
• openEuler 22.03 LTS SP4 update for erlang
• openEuler 24.03 LTS SP4 update for erlang
• openEuler 24.03 LTS SP3 update for erlang
• Debian update for erlang
• SUSE update for erlang26
• SUSE update for erlang
• SUSE update for erlang27