CVE-2026-9190

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

Progress Marklogic Server

PublishedAug 5, 2026

First seenAug 5, 2026

Weakness typeCWE-444CWE-444

How to fix

Update

progress marklogic_server11.3.6, 12.0.3 or later

Vendor advisories

community.progress.com/s/article/Marklogic-Critical-Security-Alert-Bulletin-August-2026

Affected products

Product	Affected versions	Fixed in
progress marklogic_server	v < 11.3.6, 12.0.0 ≤ v < 12.0.3	11.3.6, 12.0.3

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