9.4

CVE-2026-23941

Request smuggling via first-wins Content-Length parsing in inets httpd

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Erlang ≫ Erlang/inets Version >= 5.10 < 9.1.0.5
Erlang ≫ Erlang/inets Version >= 9.3 < 9.3.2.3
Erlang ≫ Erlang/inets Version >= 9.6 < 9.6.1
Erlang ≫ Erlang/otp Version >= 17.0 < 26.2.5.18
Erlang ≫ Erlang/otp Version >= 27.0 < 27.3.4.9
Erlang ≫ Erlang/otp Version >= 28.0 < 28.4.1
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.53% 0.404
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 9.4 3.9 5.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
6b3ad84c-e1a6-4bf7-a703-f496b71e49db 7 0 0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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