CVE-2026-23941Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') vulnerability in Erlang OTP (inets httpd module) allows HTTP Request Smuggling.
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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
- 9.4 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
erlang erlang/inets erlang:erlang/inets | from 5.10 before 9.1.0.5; from 9.3 before 9.3.2.3; from 9.6 before 9.6.1 | NVD |
erlang erlang/otp erlang:erlang/otp | from 17.0 before 26.2.5.18; from 27.0 before 27.3.4.9; from 28.0 before 28.4.1 | NVD |
References
- https://cna.erlef.org/cves/CVE-2026-23941.htmlvendor-advisory
- https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18patch
- https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45bpatch
- https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6patch
- https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7vendor-advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-23941third-party-advisory
- https://www.erlang.org/doc/system/versions.html#order-of-versionsproduct
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.