CVE-2026-9190: Progress Software MarkLogic Server · HTTP Request/Response Smuggling
Affects Progress Software MarkLogic ServerSource CVE Database V5
Not known to be exploited · CVSS 9.1 Critical : upgrade to 12.0.3 or 11.3.6 as a priority.
Data as of 3 Nov 2026, 22:58 UTC
- EPSS
- 0.7% chance of exploitation in 30 days – higher than 54% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 12.0.3, 11.3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 5 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.
What to do
Upgrade Progress Software MarkLogic Server to 12.0.3 or 11.3.6.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Progress Software CorporationMarkLogic Server | Affected
| Fixed in
|
| Progress Software CorporationMarkLogic Server | Affected
| Fixed in
|
AI-suggested
Until then, consider deploying additional network-level protections such as strict HTTP header validation or reverse proxy configurations that mitigate HTTP request smuggling risks.
Description
CVE-2026-9190 is an HTTP request smuggling vulnerability in the HTTP App Server component of Progress MarkLogic Server versions 11.0.0 and 12.0.0. This flaw allows a remote attacker to bypass authentication and authorization controls, hijack user sessions, or capture credentials by exploiting inconsistent interpretation of HTTP request boundaries between a reverse proxy and the server when both Content-Length and Transfer-Encoding headers are present in a crafted request.