CVE-2026-4111
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 0.04% · 11.4th percentile
Risk Scores
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 7 | |
| Red Hat | Red Hat Enterprise Linux 8 | |
| erlang | erlang\/otp | 27.0, 0, 28.0 |
| Red Hat | Red Hat Enterprise Linux 10 | 0:3.7.7-5.el10_1 |
| Erlang | OTP | 17.0, 0 |
| Erlang | OTP | pkg:otp/inets@5.10, 5.10 |
| Red Hat | Red Hat Enterprise Linux 6 | |
| Red Hat | Red Hat Enterprise Linux 9 | *, 0:3.5.3-7.el9_7 |
| Red Hat | Red Hat OpenShift Container Platform 4 |
Exploit Intelligence
- https://www.erlang.org/doc/system/versions.html#order-of-versions (circl)
- https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18 (circl)
- https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b (circl)
- https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6 (circl)
- https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 (circl)
- CIRCL seen: CVE-2026-23941 (circl-sighting)
- CIRCL seen: CVE-2026-23941 (circl-sighting)
- CIRCL seen: CVE-2026-4111 (circl-sighting)
- CIRCL seen: CVE-2026-4111 (circl-sighting)
- RHSA-2026:5063 (circl)
…and 109 more exploits
Timeline
- Mar 13, 2026 EPSS Score
- Mar 13, 2026 CVE Published
- Mar 14, 2026 EPSS Score
- Mar 15, 2026 EPSS Score
- Mar 16, 2026 EPSS Score
- Mar 17, 2026 EPSS Score
- Mar 17, 2026 Coalition ESS Score
- Mar 18, 2026 EPSS Score
- Mar 19, 2026 PoC Published
- Mar 19, 2026 EPSS Score
- Mar 19, 2026 PoC Published
- Mar 19, 2026 PoC Published
References
- RHSA-2026:5063 vendor-advisory
- RHSA-2026:5080 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-4111 vdb
- RHBZ#2446453 issue
- https://github.com/libarchive/libarchive/pull/2877 url
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23941 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-4111 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32775 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23943 advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23942 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-4111 advisory
- https://github.com/erlang/otp/security/advisories/GHSA-w4jc-9wpv-pqh7 vendor-advisory
- https://www.erlang.org/doc/system/versions.html#order-of-versions url
- https://github.com/erlang/otp/commit/a4b46336fd25aa100ac602eb9a627aaead7eda18 patch
- https://github.com/erlang/otp/commit/a761d391d8d08316cbd7d4a86733ba932b73c45b patch
- https://github.com/erlang/otp/commit/e775a332f623851385ab6ddb866d9b150612ddf6 patch
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37451 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37445 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37460 advisory
- https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/37449 advisory
…and 30 more