CVE-2026-6993

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-04-25. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.3
EG Score
5.3(medium)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

April 25, 2026

Last Modified

April 27, 2026

Advisory Details (4)

Auto-updated Aug 3, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
github_pr

fix: replace http.DefaultServeMux fallback with safe defaults

Upstream fix in progress (PR #3814 · go-kratos/kratos, state=open)

https://github.com/go-kratos/kratos/pull/3814
generic🟡 PoC Available

Unintended Route Exposure via DefaultServeMux Fallback · Issue #3810 · go-kratos/kratos · GitHub

https://github.com/go-kratos/kratos/issues/3810
generic

GitHub - go-kratos/kratos: Your ultimate Go microservices framework for the cloud-native era. · GitHub

https://github.com/go-kratos/kratos/
github_commit

commit 0284a5bcf92b (Yanhu007/kratos)

Fix landed in Yanhu007/kratos commit 0284a5bcf92b — awaiting tagged release

https://github.com/Yanhu007/kratos/commit/0284a5bcf92b5a7ee015300ce3051baf7ae4718d

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
gogithub.com/go-kratos/kratos/v2—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/go-kratos/kratos/v2———

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 57× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-19 17:04 UTCEPSS rescore
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-18 13:49 UTCEPSS rescore
  8. 2026-08-17 14:45 UTCEG score recompute
  9. 2026-08-17 14:45 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-16 14:56 UTCEPSS rescore
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  13. 2026-08-16 05:42 UTCEG score recompute
  14. 2026-08-16 05:42 UTCGHSA enrichment
  15. 2026-08-16 02:15 UTCEPSS rescore
  16. 2026-08-15 02:00 UTCEG score recompute
  17. 2026-08-15 02:00 UTCGHSA enrichment
  18. 2026-08-15 01:31 UTCEPSS rescore
  19. 2026-08-14 04:04 UTCEG score recompute
  20. 2026-08-14 04:04 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-12 22:06 UTCEG score recompute
  23. 2026-08-12 22:06 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 00:10 UTCEG score recompute
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  1. 2026-08-12 00:10 UTCGHSA enrichment
  2. 2026-08-11 02:06 UTCEG score recompute
  3. 2026-08-11 02:06 UTCGHSA enrichment
  4. 2026-08-11 00:00 UTCEPSS rescore
  5. 2026-08-10 01:12 UTCEG score recompute
  6. 2026-08-10 01:12 UTCGHSA enrichment
  7. 2026-08-09 13:47 UTCEPSS rescore
  8. 2026-08-09 03:15 UTCEG score recompute
  9. 2026-08-09 03:15 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-07 18:52 UTCEG score recompute
  12. 2026-08-07 18:52 UTCGHSA enrichment
  13. 2026-08-06 20:50 UTCEG score recompute
  14. 2026-08-06 20:50 UTCGHSA enrichment
  15. 2026-08-06 13:47 UTCEPSS rescore
  16. 2026-08-05 22:54 UTCEG score recompute
  17. 2026-08-05 22:54 UTCGHSA enrichment
  18. 2026-08-05 19:17 UTCEPSS rescore
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  20. 2026-08-04 15:10 UTCEPSS rescore
  21. 2026-08-04 10:39 UTCEPSS rescore
  22. 2026-08-03 20:58 UTCEG score recompute
  23. 2026-08-03 20:58 UTCGHSA enrichment
  24. 2026-08-03 10:36 UTCEPSS rescore
  25. 2026-08-02 10:31 UTCEG score recompute
  26. 2026-08-02 10:31 UTCGHSA enrichment
  27. 2026-08-02 02:27 UTCEPSS rescore
  28. 2026-08-01 04:16 UTCEPSS rescore
  29. 2026-07-30 16:28 UTCEPSS rescore
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  31. 2026-07-28 15:37 UTCEPSS rescore
  32. 2026-07-27 14:14 UTCEPSS rescore
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  34. 2026-07-25 14:18 UTCEPSS rescore
  35. 2026-07-24 14:18 UTCEPSS rescore
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  37. 2026-07-23 14:18 UTCEPSS rescore
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  39. 2026-07-23 03:22 UTCEG score recompute
  40. 2026-07-22 14:08 UTCEPSS rescore
  41. 2026-07-22 14:08 UTCEPSS rescore
  42. 2026-07-21 15:25 UTCEPSS rescore
  43. 2026-07-21 15:25 UTCEPSS rescore
  44. 2026-07-20 17:08 UTCEPSS rescore
  45. 2026-07-19 22:18 UTCOSV refresh
  46. 2026-07-19 14:31 UTCEPSS rescore
  47. 2026-07-19 02:29 UTCEPSS rescore
  48. 2026-07-18 10:04 UTCEPSS rescore
  49. 2026-07-16 17:03 UTCEPSS rescore
  50. 2026-07-15 16:57 UTCEPSS rescore
  51. 2026-07-15 02:00 UTCEPSS rescore
  52. 2026-07-13 22:31 UTCEPSS rescore
  53. 2026-07-13 06:13 UTCEPSS rescore
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  55. 2026-07-12 05:46 UTCEPSS rescore
  56. 2026-07-11 08:27 UTCEPSS rescore
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  58. 2026-07-09 19:10 UTCEPSS rescore
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  60. 2026-07-08 15:16 UTCEPSS rescore
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  62. 2026-07-07 13:46 UTCEPSS rescore
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  64. 2026-07-06 16:27 UTCEPSS rescore
  65. 2026-07-06 16:27 UTCEPSS rescore
  66. 2026-07-06 02:23 UTCEPSS rescore
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  68. 2026-07-05 02:31 UTCEPSS rescore
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  70. 2026-07-04 06:31 UTCEPSS rescore
  71. 2026-07-04 06:31 UTCEPSS rescore
  72. 2026-07-01 15:07 UTCEPSS rescore
  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-29 14:06 UTCEPSS rescore
  75. 2026-06-28 14:07 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-6993?
CVE-2026-6993 is a medium vulnerability published on April 25, 2026. 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…
When was CVE-2026-6993 disclosed?
CVE-2026-6993 was first published in the National Vulnerability Database on April 25, 2026, with the most recent update on April 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6993 actively exploited?
CVE-2026-6993 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 76.3% of all scored CVEs.
What is the CVSS score of CVE-2026-6993?
CVE-2026-6993 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-6993?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6993, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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