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Vulnerability record · CVE-2026-23941 · published 13 March 2026

CVE-2026-23941: Erlang\/inets http request smuggling vulnerability

Erlang · Erlang\/Inets

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 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 before 9.6.1, 9.3.2.3 and 9.1.0.5.

7.0 CVSS 4.0 High EPSS 0.45% · top 63.2% CWE-444 · HTTP request smuggling
7.0CVSS 4.0 base score
0.45%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
7References
24 Jul 2026Last modified by NVD

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 28.4.1, OTP 27.3.4.9 and OTP 26.2.5.18, corresponding to inets from 5.10 before 9.6.1, 9.3.2.3 and 9.1.0.5.

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:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-23941), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.