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Description

A security flaw has been discovered in go-kratos kratos up to 2.9.2. This impacts the function NewServer of the file transport/http/server.go of the component http.DefaultServeMux Fallback Handler. The manipulation results in unintended intermediary. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. The patch is identified as 0284a5bcf92b5a7ee015300ce3051baf7ae4718d. Applying a patch is advised to resolve this issue.

PUBLISHED Reserved 2026-04-24 | Published 2026-04-25 | Updated 2026-04-27 | Assigner VulDB




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C
5.0AV:N/AC:L/Au:N/C:P/I:N/A:N/E:POC/RL:OF/RC:C

Problem types

Unintended Intermediary

Product status

2.9.0
affected

2.9.1
affected

2.9.2
affected

Timeline

2026-04-24:Advisory disclosed
2026-04-24:VulDB entry created
2026-04-24:VulDB entry last update

Credits

Yu_Bao (VulDB User) reporter

References

vuldb.com/vuln/359545 (VDB-359545 | go-kratos http.DefaultServeMux Fallback server.go NewServer confused deputy) vdb-entry technical-description

vuldb.com/vuln/359545/cti (VDB-359545 | CTI Indicators (IOB, IOC, IOA)) signature permissions-required

vuldb.com/submit/797099 (Submit #797099 | go-kratos kratos 2.9.2 Unintended Route Exposure via DefaultServeMux Fallback) third-party-advisory

github.com/go-kratos/kratos/issues/3810 exploit issue-tracking

github.com/go-kratos/kratos/pull/3814 issue-tracking patch

github.com/...ommit/0284a5bcf92b5a7ee015300ce3051baf7ae4718d patch

github.com/go-kratos/kratos/ product

cve.org (CVE-2026-6993)

nvd.nist.gov (CVE-2026-6993)

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