Medium [CVE-2026-38969] Request smuggling via re-parsing of Content-Length header
This medium-severity Red Hat Linux advisory covers CVE-2026-38969 affecting Red Hat Hardened Images, Red Hat 3scale API Management Platform 2, Red Hat Enterprise Linux 9.
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Summary
ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling. NOTE: the Supplier reports that "The project README states that it is suitable for testing and development, and that its developers do not encourage its use to serve production web applications that may be subject to hostile input.
It is not a production web server and is not intended to receive traffic from untrusted sources. Request smuggling is only reachable when WEBrick sits behind a proxy and receives hostile traffic in a production deployment, which is the configuration the project documents as discouraged." This CVE has been marked as Rejected by the assigning CNA.
Red Hat severity: not rated. Weakness: CWE-444.
Affected Red Hat products: Red Hat Hardened Images; Red Hat 3scale API Management Platform 2; Red Hat Enterprise Linux 9; Red Hat Satellite 6. Red Hat fixing advisory: RHSA-2026:34975.
Affected products named by the advisory: Red Hat package: pcs.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
- rust-main-1.96.1-1.hum1
- RHSA-2026:34975
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
Mitigation checklist
- Do not expose WEBrick directly to untrusted network traffic. WEBrick is not designed for production use and should be replaced with a production-grade Ruby application server (e.g., Puma, Unicorn) behind a reverse proxy (e.g., nginx, Apache, HAProxy) that performs its own Content-Length validation and strips or rejects requests with conflicting transfer encoding headers. A patch is available: https://github.com/ruby/webrick/pull/199
Official advisory · high-confidence parse· fetched 1 month ago·verify at source
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