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 before OTP 26.2.5.18, OTP 27.3.4.9, and OTP 28.4.1, corresponding to inets from 5.10 before 9.1.0.5, 9.3.2.3, and 9.6.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Affected products
erlang: erlang\/inets; erlang: erlang\/otp
References7
- cna.erlef.org/cves/CVE-2026-23941.html Vendor Advisory
- github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 Vendor Advisory
- github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead… Patch
- github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b… Patch
- github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b1506… Patch
- osv.dev/vulnerability/EEF-CVE-2026-23941 Third Party Advisory
- www.erlang.org/doc/system/versions.html#order-of-versions Product
Metrics
- CVSS 3.1
-
9.4
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L - CVSS 4.0
-
7.0
HIGH
Score source: CNA
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 - EPSS — exploit probability
- 1% percentile: 44 · as of 12 November 2026
- CWE
- CWE-444
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