CVE-2026-6993: go-kratos http.DefaultServeMux Fallback server.go NewServer confused deputy
Vulnerability summary
CVE-2026-6993 is a medium (CVSS 6.9) Unintended Proxy or Intermediary vulnerability in go-kratos kratos. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 24.4% of scored vulnerabilities. 1 public exploit is recorded.
Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3 · Related 3Timeline
- 25-04-2026PublishedVulnerability first disclosed.
- 27-04-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
10 scores · 4 sources · 4 versions- OSV · GoEcosystem advisory · calculated6.9MediumCVSS: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
- OSV · ChainguardEcosystem advisory · calculated6.9MediumCVSS: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
- NVDNIST5.5MediumCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XDiffers
- OSV · GoEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- NVDNIST5.0MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
EPSS trend
Probability
0.32%
Chance of exploitation in the next 30 days
Percentile
24%
Versus all other CVEs
30-day change
Decrease -0.22 pp
From 0.54% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundKratos
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard8 products
- chainloop-artifact-casAll versions (No fix recorded)
- chainloop-artifact-cas-fipsAll versions (No fix recorded)
- chainloop-cliAll versions (No fix recorded)
- chainloop-cli-fipsAll versions (No fix recorded)
- chainloop-control-planeAll versions (No fix recorded)
Github.com/go-kratos/kratos1 product
- v2≤ 2.9.2 | All versions (No fix recorded)
Go-kratos1 product
- kratos2.9.0 | 2.9.1 | 2.9.2
3 vendors · 10 products
References
11 links
- github.com/go-kratos/kratosPACKAGE