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CVE-2026-9190 is an HTTP request smuggling vulnerability in the HTTP App Server component of Progress MarkLogic Server. It affects MarkLogic Server 11.x before 11.3.6 and 12.x before 12.0.3. The flaw arises when a crafted HTTP request containing both Content-Length and Transfer-Encoding headers is processed inconsistently by an upstream reverse proxy and MarkLogic Server, causing the two systems to disagree on request boundaries. This parser discrepancy enables request smuggling conditions that can let attacker-controlled data be interpreted as part of a subsequent request stream. The vulnerability is classified as CWE-444.
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A vulnerability listed in Progress Software's August 2026 MarkLogic Server security alert affecting MarkLogic Server prior to 11.3.6 and prior to 12.0.3.
A vulnerability affecting Progress Software MarkLogic Server prior to versions 11.3.6 and 12.0.3.
An HTTP request smuggling vulnerability in Progress MarkLogic Server's HTTP App Server that can allow remote attackers to bypass authentication and authorization, hijack sessions, or capture credentials due to inconsistent parsing of Content-Length and Transfer-Encoding headers between a reverse proxy and MarkLogic Server.
A specific vulnerability in Progress MarkLogic Server disclosed in an August 2026 critical security alert bulletin; the bulletin states the set of flaws could allow unauthorized access to or control of affected MarkLogic Server instances.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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