Infinite loop in otp - CVE-2026-54886

Vulnerability identifier: #VU136826

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-54886

CWE-ID: CWE-835

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to an infinite loop in handle_data/4 in ssh_sftpd.erl when processing SSH_MSG_CHANNEL_EXTENDED_DATA on an established SFTP channel. A remote user can send a specially crafted extended data message to cause a denial of service.

The issue affects targeted SFTP channel processes, which become permanently unresponsive while continuing to consume CPU time and accumulate unbounded message queue memory. Opening many channels can amplify the impact.

otp
openEuler
Fedora
erlang-compiler
erlang-reltool
erlang-public_key
erlang-parsetools
erlang-os_mon
erlang-odbc
erlang-observer
erlang-mnesia
erlang-megaco
erlang-kernel
erlang-jinterface
erlang-inets
erlang-hipe
erlang
erlang-asn1
erlang-common_test
erlang-runtime_tools
erlang-crypto
erlang-debugger
erlang-debuginfo
erlang-debugsource
erlang-dialyzer
erlang-diameter
erlang-edoc
erlang-eldap
erlang-erl_docgen
erlang-erl_interface
erlang-erts
erlang-et
erlang-eunit
erlang-examples
erlang-ftp
erlang-sasl
erlang-xmerl
erlang-wx
erlang-tools
erlang-tftp
erlang-syntax_tools
erlang-stdlib
erlang-ssl
erlang-ssh
erlang-snmp
erlang-src

Install security update from vendor's website.

otp - addressed in versions 27.3.4.14, 28.5.0.3, 29.0.3
erlang-compiler - 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-jinterface - 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 - 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-common_test - 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-crypto - 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-debuginfo - 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-dialyzer - 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-edoc - 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-erl_docgen - 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-erts - 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-eunit - 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-ftp - 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-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-src - update to 25.3.2.6-18
erlang - addressed in versions 26.2.5.21-4.fc43, 26.2.5.21-4.fc44

• https://github.com/erlang/otp/security/advisories/GHSA-7wp4-pc27-2vj9

• Multiple vulnerabilities in otp
• Fedora 44 update for erlang
• Fedora 43 update for erlang
• 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