Inconsistent interpretation of HTTP requests in Erlang OTP - CVE-2026-23941

Vulnerability identifier: #VU125775

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-23941

CWE-ID: CWE-444

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to smuggle HTTP requests.

The vulnerability exists due to inconsistent interpretation of HTTP requests in inets httpd Content-Length parsing when processing requests with duplicate Content-Length headers that contain different values. A remote attacker can send a specially crafted request to smuggle HTTP requests.

Exploitation requires httpd to be deployed behind a reverse proxy, load balancer, or CDN that uses a different Content-Length resolution strategy, typically with persistent connections enabled.

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

Install security update from vendor's website.

Erlang OTP - addressed in versions 26.2.5.18, 27.3.4.9, 28.4.1
PowerVC - update to 2.3.2
erlang (Ubuntu package) - addressed in versions 1:16.b.3-dfsg-1ubuntu2.2+esm2, 1:18.3-dfsg-1ubuntu3.1+esm3, 1:20.2.2+dfsg-1ubuntu2+esm3, 1:22.2.7+dfsg-1ubuntu0.5+esm2, 1:24.2.1+dfsg-1ubuntu0.7, 1:25.3.2.8+dfsg-1ubuntu4.7, 1:27.3.4.6+dfsg-1ubuntu0.1
erlang-inets - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-examples - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-hipe - update to 23.3.4.9-10
erlang-ftp - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-eunit - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-et - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-erts - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-erl_interface - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-erl_docgen - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-eldap - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-edoc - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-diameter - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-dialyzer - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-debugsource - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-debuginfo - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-debugger - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-crypto - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-compiler - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-common_test - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-asn1 - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-kernel - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-xmerl - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-wx - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-tools - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-tftp - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-syntax_tools - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-stdlib - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-ssl - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-ssh - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-snmp - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-sasl - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-reltool - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-jinterface - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-megaco - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-mnesia - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-runtime_tools - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-observer - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-odbc - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-os_mon - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-parsetools - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-public_key - addressed in versions 23.3.4.9-10, 25.3.2.6-13
erlang-doc - update to 23.3.4.19-150300.3.32.1
erlang-epmd-debuginfo - update to 23.3.4.19-150300.3.32.1
erlang-observer-src - update to 23.3.4.19-150300.3.32.1
erlang-diameter - update to 23.3.4.19-150300.3.32.1
erlang-src - update to 23.3.4.19-150300.3.32.1
erlang-et - update to 23.3.4.19-150300.3.32.1
erlang-diameter-src - update to 23.3.4.19-150300.3.32.1
erlang-reltool-src - update to 23.3.4.19-150300.3.32.1
erlang-jinterface-src - update to 23.3.4.19-150300.3.32.1
erlang-dialyzer-debuginfo - update to 23.3.4.19-150300.3.32.1
erlang-jinterface - update to 23.3.4.19-150300.3.32.1
erlang-reltool - update to 23.3.4.19-150300.3.32.1
erlang-debugger - update to 23.3.4.19-150300.3.32.1
erlang-wx-debuginfo - update to 23.3.4.19-150300.3.32.1
erlang-observer - update to 23.3.4.19-150300.3.32.1
erlang-epmd - update to 23.3.4.19-150300.3.32.1
erlang-et-src - update to 23.3.4.19-150300.3.32.1
erlang-wx - update to 23.3.4.19-150300.3.32.1
erlang-wx-src - update to 23.3.4.19-150300.3.32.1
erlang - update to 23.3.4.19-150300.3.32.1
erlang-debugsource - update to 23.3.4.19-150300.3.32.1
erlang-dialyzer - update to 23.3.4.19-150300.3.32.1
erlang-debugger-src - update to 23.3.4.19-150300.3.32.1
erlang-dialyzer-src - update to 23.3.4.19-150300.3.32.1
erlang-debuginfo - update to 23.3.4.19-150300.3.32.1
erlang-src - update to 25.3.2.6-13
erlang26-et-src - update to 26.2.1-150300.7.25.1
erlang26-observer - update to 26.2.1-150300.7.25.1
erlang26-wx-src - update to 26.2.1-150300.7.25.1
erlang26-wx - update to 26.2.1-150300.7.25.1
erlang26 - update to 26.2.1-150300.7.25.1
erlang26-jinterface - update to 26.2.1-150300.7.25.1
erlang26-epmd - update to 26.2.1-150300.7.25.1
erlang26-epmd-debuginfo - update to 26.2.1-150300.7.25.1
erlang26-doc - update to 26.2.1-150300.7.25.1
erlang26-diameter-src - update to 26.2.1-150300.7.25.1
erlang26-debugsource - update to 26.2.1-150300.7.25.1
erlang26-diameter - update to 26.2.1-150300.7.25.1
erlang26-observer-src - update to 26.2.1-150300.7.25.1
erlang26-debugger-src - update to 26.2.1-150300.7.25.1
erlang26-reltool-src - update to 26.2.1-150300.7.25.1
erlang26-dialyzer-debuginfo - update to 26.2.1-150300.7.25.1
erlang26-jinterface-src - update to 26.2.1-150300.7.25.1
erlang26-src - update to 26.2.1-150300.7.25.1
erlang26-dialyzer - update to 26.2.1-150300.7.25.1
erlang26-debugger - update to 26.2.1-150300.7.25.1
erlang26-et - update to 26.2.1-150300.7.25.1
erlang26-reltool - update to 26.2.1-150300.7.25.1
erlang26-dialyzer-src - update to 26.2.1-150300.7.25.1
erlang26-wx-debuginfo - update to 26.2.1-150300.7.25.1
erlang26-debuginfo - update to 26.2.1-150300.7.25.1

• https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7

• Multiple vulnerabilities in otp
• openEuler 24.03 LTS SP1 update for erlang
• openEuler 24.03 LTS update for erlang
• openEuler 24.03 LTS SP3 update for erlang
• openEuler 24.03 LTS SP2 update for erlang
• SUSE update for erlang
• IBM PowerVC update for Erlang OTP
• SUSE update for erlang26
• openEuler 22.03 LTS SP4 update for erlang
• Ubuntu update for erlang