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CVE-2026-4111 PUBLISHED CVSS 7.5 HIGH

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.

EPSS 0.02% · 4.9th percentile

Risk Scores

CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
0.02%
4.9th percentile

Affected Products

VendorProductVersions
Red HatRed Hat Enterprise Linux 7
Red HatRed Hat Enterprise Linux 8
erlangerlang\/otp28.0, 27.0, 0
Red HatRed Hat Enterprise Linux 100:3.7.7-5.el10_1
ErlangOTP17.0, 0
ErlangOTP5.10, pkg:otp/inets@5.10
Red HatRed Hat Enterprise Linux 6
Red HatRed Hat Enterprise Linux 90:3.5.3-7.el9_7, 0:3.5.3-7.el9_7
Red HatRed Hat OpenShift Container Platform 4

Timeline

References

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