CVE-2026-23941

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-23941
Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling. This vulnerability is associated with program files lib/inets/src/http_server/httpd_request.erl and program routines httpd_request:parse_headers/7. The server does not reject or normalize duplicate Content-Length headers. The earliest Content-Length in the request is used for body parsing while common reverse proxies (nginx, Apache httpd, Envoy) honor the last Content-Length value. This violates RFC 9112 Section 6.3 and allows front-end/back-end desynchronization, leaving attacker-controlled bytes queued as the start of the next request. This issue affects OTP from OTP 17.0 until OTP 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 until 9.6.1, 9.3.2.3 and 9.1.0.5.

9.4 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://cna.erlef.org/cves/CVE-2026-23941.html Vendor Advisory
https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18 Patch
https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b Patch
https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6 Patch
https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-23941 Third Party Advisory
https://www.erlang.org/doc/system/versions.html#order-of-versions Product
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:erlang:erlang\/inets:*:*:*:*:*:*:*:*
cpe:2.3:a:erlang:erlang\/inets:*:*:*:*:*:*:*:*
cpe:2.3:a:erlang:erlang\/inets:*:*:*:*:*:*:*:*
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
History

21 May 2026, 15:22

Type Values Removed Values Added
References () https://cna.erlef.org/cves/CVE-2026-23941.html - () https://cna.erlef.org/cves/CVE-2026-23941.html - Vendor Advisory
References () https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18 - () https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18 - Patch
References () https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b - () https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b - Patch
References () https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6 - () https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6 - Patch
References () https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 - () https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 - Vendor Advisory
References () https://osv.dev/vulnerability/EEF-CVE-2026-23941 - () https://osv.dev/vulnerability/EEF-CVE-2026-23941 - Third Party Advisory
References () https://www.erlang.org/doc/system/versions.html#order-of-versions - () https://www.erlang.org/doc/system/versions.html#order-of-versions - Product
First Time Erlang
Erlang erlang\/otp
Erlang erlang\/inets
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.4
CPE cpe:2.3:a:erlang:erlang\/inets:*:*:*:*:*:*:*:*
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*

06 Apr 2026, 17:17

Type Values Removed Values Added
Summary
  • (es) La vulnerabilidad de Interpretación inconsistente de solicitudes HTTP ('Contrabando de solicitudes HTTP') en Erlang OTP (módulo inets httpd) permite el contrabando de solicitudes HTTP. Esta vulnerabilidad está asociada con los archivos de programa lib/inets/src/http_server/httpd_request.erl y las rutinas de programa httpd_request:parse_headers/7. El servidor no rechaza ni normaliza los encabezados Content-Length duplicados. El Content-Length más temprano en la solicitud se utiliza para el análisis del cuerpo, mientras que los proxies inversos comunes (nginx, Apache httpd, Envoy) respetan el último valor de Content-Length. Esto viola la Sección 6.3 de RFC 9112 y permite la desincronización front-end/back-end, dejando bytes controlados por el atacante en cola como el inicio de la siguiente solicitud. Este problema afecta a OTP desde OTP 17.0 hasta OTP 28.4.1, OTP 27.3.4.9 y OTP 26.2.5.18, lo que corresponde a inets desde 5.10 hasta 9.6.1, 9.3.2.3 y 9.1.0.5.
References
  • () https://cna.erlef.org/cves/CVE-2026-23941.html -
  • () https://osv.dev/vulnerability/EEF-CVE-2026-23941 -

13 Mar 2026, 19:54

Type Values Removed Values Added
New CVE
Information

Published : 2026-03-13 19:54

Updated : 2026-05-21 15:22

NVD link : CVE-2026-23941

Mitre link : CVE-2026-23941

CVE.ORG link : CVE-2026-23941

JSON object : View

Products Affected

erlang

  • erlang\/inets
  • erlang\/otp
CWE
CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')