HTTP request smuggling in Progress MarkLogic Server
Published Aug 5, 2026
9.1
CRITICALCVSS 3.1
EPSS 0.74%
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.
Affected products
-
- Version 11.0.0StatusaffectedConstraints<11.3.6
- Version 12.0.0StatusaffectedConstraints<12.0.3
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Progress Software Corporation | MarkLogic Server | unaffected |
|
- < 11.3.6
- ≥ 12.0.0 · < 12.0.3
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Vendor solution
Do not expose MarkLogic HTTP App Servers directly to untrusted networks. Configure a reverse proxy or web application firewall to reject requests that contain both Content-Length and Transfer-Encoding headers, and restrict access to trusted networks until the update can be applied.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Aug 5, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
Aug-Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.74% (0.00737) | 52.90th | v5 (v2026.06.15) |
| Aug 6, 2026 | 0.42% (0.00422) | 34.77th | v5 (v2026.06.15) |
References (1)
- https://community.progress.com/s/article/Marklogic-Critical-Security-Alert-Bulletin-August-2026 vendor-advisoryVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://community.progress.com/s/article/Marklogic-Critical-Security-Alert-Bulletin-August-2026 | vendor-advisoryVendor Advisory |
Change history (0)
No recorded changes yet.