go-kratos up to 2.9.2 http.DefaultServeMux Fallback transport/http/server.go NewServer confused deputy
Summary
A vulnerability marked as problematic has been reported in go-kratos kratos up to 2.9.2. Affected is the function NewServer of the file transport/http/server.go of the component http.DefaultServeMux Fallback Handler. This manipulation causes confused deputy.
This vulnerability is registered as CVE-2026-6993. Remote exploitation of the attack is possible. Furthermore, an exploit is available.
It is suggested to install a patch to address this issue.
Details
A vulnerability has been found in go-kratos kratos up to 2.9.2 and classified as problematic. Affected by this vulnerability is the function NewServer of the file transport/http/server.go of the component http.DefaultServeMux Fallback Handler. The manipulation with an unknown input leads to a confused deputy vulnerability. The CWE definition for the vulnerability is CWE-441. The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor. As an impact it is known to affect confidentiality.
The advisory is shared at github.com. This vulnerability is known as CVE-2026-6993. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known.
It is possible to download the exploit at github.com. It is declared as proof-of-concept.
Applying the patch 0284a5bcf92b5a7ee015300ce3051baf7ae4718d is able to eliminate this problem. The bugfix is ready for download at github.com.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Product
Vendor
Name
Version
License
Website
- Product: https://github.com/go-kratos/kratos/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 5.3VulDB Meta Temp Score: 4.8
VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Confused deputyCWE: CWE-441
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
0-Day Time: 🔒
Patch: 0284a5bcf92b5a7ee015300ce3051baf7ae4718d
Timeline
04/24/2026 Advisory disclosed04/24/2026 VulDB entry created
04/24/2026 VulDB entry last update
Sources
Product: github.comAdvisory: 3810
Status: Confirmed
Confirmation: 🔒
CVE: CVE-2026-6993 (🔒)
GCVE (CVE): GCVE-0-2026-6993
GCVE (VulDB): GCVE-100-359545
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 04/24/2026 21:48Changes: 04/24/2026 21:48 (61)
Complete: 🔍
Submitter: Yu_Bao
Cache ID: 216::103
Submit
Accepted
- Submit #797099: go-kratos kratos 2.9.2 Unintended Route Exposure via DefaultServeMux Fallback (by Yu_Bao)
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
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