CVE-2026-9190: Progress Marklogic Server

Critical severity, CVSS 9.1. EPSS: 0.7% chance of exploitation in the next 30 days.

An HTTP request smuggling vulnerability in the HTTP App Server of Progress MarkLogic Server before 11.3.6 and 12.0.3 allows a remote attacker to bypass authentication and authorization checks, hijack a legitimate user's session, or capture credentials. The vulnerability occurs when a crafted HTTP request containing both Content-Length and Transfer-Encoding headers causes a reverse proxy and MarkLogic Server to interpret request boundaries differently.

Affected products

• Progress Marklogic Server: before 11.3.6 (fixed in 11.3.6); from 12.0.0, before 12.0.3 (fixed in 12.0.3)

Published 2026-08-05. Last modified 2026-09-03.