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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade erlang | May 19, 2026 | May 19, 2026 |
| Ubuntu | — | Upgrade erlang-megacoUpgrade erlang-ssl (Ubuntu Pro)Upgrade erlang-megaco (Ubuntu Pro)Upgrade erlang-base-hipe (Ubuntu Pro)Upgrade erlang-base (Ubuntu Pro)Upgrade erlang-eldap (Ubuntu Pro)Upgrade erlang-inets (Ubuntu Pro)Upgrade erlang-sslUpgrade erlang-snmp (Ubuntu Pro)Upgrade erlang-eldapUpgrade erlang-public-keyUpgrade erlang-baseUpgrade erlang-inetsUpgrade erlang-snmp | Sep 29, 2026 | Sep 28, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Mar 13, 2026 |
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