CVE-2026-23941 Affecting erlang package, versions <1:25.2.3+dfsg-1+deb12u4


Severity

Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
0.53% (41st percentile)

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  • Snyk IDSNYK-ECHOLATEST-ERLANG-18353405
  • published28 Jul 2026
  • disclosed13 Mar 2026

Introduced: 13 Mar 2026

CVE-2026-23941  (opens in a new tab)

How to fix?

Upgrade Echo:latest erlang to version 1:25.2.3+dfsg-1+deb12u4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream erlang package and not the erlang package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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 Base Scores

version 3.1