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CVE-2026-23941
Erlang OTP HTTP Request Smuggling
Description

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.

INFO

Published Date :

March 13, 2026, 10:23 a.m.

Last Modified :

March 13, 2026, 10:23 a.m.

Remotely Exploit :

No

Source :

None
Affected Products

The following products are affected by CVE-2026-23941 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

No affected product recoded yet

: Total Affected Vendor : 0 | Products : 0
Solution
Normalize or reject duplicate Content-Length headers to prevent request desynchronization.
  • Update Erlang OTP to a patched version.
  • Configure proxies to handle duplicate Content-Length headers.
  • Ensure consistent header handling between front-end and back-end.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-23941.

URL Resource
https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 vendor-advisory
https://www.erlang.org/doc/system/versions.html#order-of-versions x_version-scheme
https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18 patch
https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b patch
https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6 patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-23941 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-23941 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-23941 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.