CVE-2026-23941Critical· 9.4▾ MidnightInconsistent 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_…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 51.7 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
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.
erlang/inets >= 5.10, < 9.1.0.5erlang/inets >= 9.3, < 9.3.2.3erlang/inets >= 9.6, < 9.6.1erlang/otp >= 17.0, < 26.2.5.18erlang/otp >= 27.0, < 27.3.4.9erlang/otp >= 28.0, < 28.4.1Upgrade past the affected range:
erlang/inets 9.6.1erlang/otp 28.4.1Connected by shared product, vendor, weakness, or advisory.
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