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CVE-2026-69204: Product identification pending

Severity

9.2 (CRITICAL)

Affected versions

Before 0.23.35

Fixed version

0.23.35

Patch status

Patched

Published

2026-09-15T19:17:37.580

Modified

2026-09-15T19:17:37.580

Why it matters

This matters because the affected product may be exploitable without valid credentials. Internet-facing deployments should be reviewed first.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.
• Compare installed versions against the affected version range in the advisory.
• Treat internet-facing systems as higher priority.

Technical summary

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember HTTP/1.1 does not reject messages containing both Transfer-Encoding and Content-Length, so an intermediary and Ember can select different body framing rules. When ember-server is behind a keep-alive intermediary that forwards both headers and frames by Content-Length, an unauthenticated attacker can smuggle a second request, bypass intermediary access controls, poison caches, or cause a victim request to be joined to an attacker-controlled prefix. The shared response parser can also desynchronize an ember-client connection when a malicious or compromised upstream sends both headers. This issue is fixed in versions 0.23.35 and 1.0.0-M47.

View the official NVD record for CVE-2026-69204

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.