CVE-2026-23941 remediation guide

Erlang OTP, erlang/inets, erlang/otp

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...

Open CVE record

ProductErlang OTP, erlang/inets, erlang/otp

Affected versions>= 5.10, >= 17.0, >= 84adefa331c4159d432d22840663c38f155cd4c1, >= 5.10 < 9.1.0.5, >= 9.3 < 9.3.2.3, >= 9.6 < 9.6.1, >= 17.0 < 26.2.5.18, >= 27.0 < 27.3.4.9, >= 28.0 < 28.4.1

Fixed versions9.1.0.5, 9.3.2.3, 9.6.1, 26.2.5.18, 27.3.4.9, 28.4.1

Priority basisReview · CVSS 7 · EPSS 0.53%

Identify the affected asset

Confirm whether Erlang OTP, erlang/inets, erlang/otp is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 5.10, >= 17.0, >= 84adefa331c4159d432d22840663c38f155cd4c1, >= 5.10 < 9.1.0.5, >= 9.3 < 9.3.2.3, >= 9.6 < 9.6.1, >= 17.0 < 26.2.5.18, >= 27.0 < 27.3.4.9, >= 28.0 < 28.4.1. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 9.1.0.5, 9.3.2.3, 9.6.1, 26.2.5.18, 27.3.4.9, 28.4.1. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.