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  4. CVE 2026 23941 request smuggling via first wins content length
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Back to active CVEs
High · CVSS 7.0CVE-2026-23941

Request smuggling via first-wins Content-Length parsing in inets httpdCVE-2026-23941

Answer in brief

CVE-2026-23941 records a High severity (CVSS 7.0) vulnerability in Request smuggling via first-wins Content-Length parsing in inets httpd. The current sources do not mark it as known exploited. The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 13, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-444
Source
CVE List V5
Source checked
Nov 11, 2026
References
7 linked sources
Open source record

Key facts

Risk
High · CVSS 7.0
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Erlang/erlang/otp (generic), Erlang/OTP (generic), Erlang/OTP (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Erlang/erlang/otpgeneric>=84adefa331c4159d432d22840663c38f155cd4c1 <**
Erlang/OTPgeneric>=17.0 <**
Erlang/OTPgeneric>=5.10 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Erlang/erlang/otp, Erlang/OTP, Erlang/OTP.
  2. 2Review the reported fix. Source-reported workaround: * Configure frontend proxy to reject requests with duplicate Content-Length headers. * Disable HTTP keep-alive on httpd by adding {keep_alive, false} to httpd configuration. Note: This impacts performance for clients making multiple requests. * Deploy a Web Application Firewall (WAF) configured to reject requests with multiple Content-Length headers.

Evidence timeline and material changes

  1. Published upstream

    Mar 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

  • Source referencecna.erlef.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referenceosv.dev
  • Source referenceerlang.org
Upstream source 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 26.2.5.18, OTP 27.3.4.9, and OTP 28.4.1, corresponding to inets from 5.10 before 9.1.0.5, 9.3.2.3, and 9.6.1. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.

Quoted source text, attributed separately from HOL analysis.