---
id: CVE-2026-9190
title: >-
  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 captu…
summary: >-
  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 captu…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-444
published: '2026-08-05'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-9190'
references:
  - url: >-
      https://community.progress.com/s/article/Marklogic-Critical-Security-Alert-Bulletin-August-2026
    label: security@progress.com
tags:
  - nvd
epss: 0.00426
epssPercentile: 0.36466
ingestedAt: '2026-08-29T16:39:14.040Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.