CVE-2026-66063

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 86% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.5, the httpserver/updown.go multipart upload handler split part.FileName() on / but did not reject .., allowing an unauthenticated upload with filename .. to create a file outside the served tree. This issue is fixed in version 2.1.5.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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
Severity65% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

July 28, 2026

Last Modified

July 30, 2026

Advisory Details (2)

Auto-updated Jul 28, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Path Traversal · Advisory · goshs-labs/goshs · GitHub

https://github.com/goshs-labs/goshs/security/advisories/GHSA-wg2q-39h6-66x9
github_commit

commit f3ef599e4091 (goshs-labs/goshs)

Fix landed in goshs-labs/goshs commit f3ef599e4091 — awaiting tagged release

https://github.com/goshs-labs/goshs/commit/f3ef599e409151d1380866e47de8b1afb0bb54fa

Vendor Advisories for CVE-2026-66063(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 1 ecosystem)
Go(4)
PackageVulnerable rangeFixed inDependents
github.com/patrickhener/goshs———
github.com/patrickhener/goshs/v2—2.1.5-0.20260727065949-f3ef599e4091—
goshs.de/goshs———
goshs.de/goshs/v2—2.1.5-0.20260727065949-f3ef599e4091—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 44× 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.

  1. 2026-09-15 08:31 UTCEG score recompute
  2. 2026-09-14 08:25 UTCEG score recompute
  3. 2026-09-13 08:30 UTCEG score recompute
  4. 2026-09-12 08:37 UTCEG score recompute
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 09:37 UTCEPSS rescore
  7. 2026-09-11 07:43 UTCEG score recompute
  8. 2026-09-09 07:57 UTCEG score recompute
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-07 20:54 UTCEG score recompute
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 19:01 UTCEG score recompute
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-05 19:08 UTCEG score recompute
  15. 2026-09-05 15:31 UTCEPSS rescore
  16. 2026-09-04 11:59 UTCEG score recompute
  17. 2026-09-04 05:07 UTCEPSS rescore
  18. 2026-09-02 14:12 UTCEPSS rescore
  19. 2026-09-02 00:50 UTCEG score recompute
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-08-30 23:21 UTCEG score recompute
  23. 2026-08-30 19:17 UTCEPSS rescore
  24. 2026-08-30 01:22 UTCEPSS rescore
  25. 2026-08-29 23:28 UTCEG score recompute
Show 55 more
  1. 2026-08-28 21:42 UTCEPSS rescore
  2. 2026-08-27 20:56 UTCEG score recompute
  3. 2026-08-26 19:40 UTCEG score recompute
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-25 18:56 UTCEG score recompute
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 19:04 UTCEG score recompute
  8. 2026-08-23 19:11 UTCEG score recompute
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 19:19 UTCEG score recompute
  11. 2026-08-21 23:49 UTCEPSS rescore
  12. 2026-08-21 19:26 UTCEG score recompute
  13. 2026-08-20 22:56 UTCEPSS rescore
  14. 2026-08-19 19:41 UTCEG score recompute
  15. 2026-08-19 17:04 UTCEPSS rescore
  16. 2026-08-18 19:48 UTCEG score recompute
  17. 2026-08-18 13:48 UTCEPSS rescore
  18. 2026-08-17 19:56 UTCEG score recompute
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-16 17:49 UTCEG score recompute
  21. 2026-08-16 14:56 UTCEPSS rescore
  22. 2026-08-15 17:57 UTCEG score recompute
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 18:05 UTCEG score recompute
  25. 2026-08-13 22:00 UTCEPSS rescore
  26. 2026-08-12 18:19 UTCEG score recompute
  27. 2026-08-12 13:51 UTCEPSS rescore
  28. 2026-08-11 18:19 UTCEG score recompute
  29. 2026-08-11 00:00 UTCEPSS rescore
  30. 2026-08-09 18:28 UTCEG score recompute
  31. 2026-08-09 13:47 UTCEPSS rescore
  32. 2026-08-08 18:36 UTCEG score recompute
  33. 2026-08-08 16:37 UTCEPSS rescore
  34. 2026-08-07 18:43 UTCEG score recompute
  35. 2026-08-06 18:51 UTCEG score recompute
  36. 2026-08-06 13:47 UTCEPSS rescore
  37. 2026-08-05 19:17 UTCEPSS rescore
  38. 2026-08-05 19:17 UTCEPSS rescore
  39. 2026-08-04 19:07 UTCEG score recompute
  40. 2026-08-04 15:10 UTCEPSS rescore
  41. 2026-08-04 10:39 UTCEPSS rescore
  42. 2026-08-03 19:14 UTCEG score recompute
  43. 2026-08-03 10:36 UTCEPSS rescore
  44. 2026-08-02 19:22 UTCEG score recompute
  45. 2026-08-02 02:27 UTCEPSS rescore
  46. 2026-08-01 19:30 UTCEG score recompute
  47. 2026-08-01 04:16 UTCEPSS rescore
  48. 2026-07-30 19:44 UTCEG score recompute
  49. 2026-07-30 16:28 UTCEPSS rescore
  50. 2026-07-30 15:42 UTCEG score recompute
  51. 2026-07-30 01:30 UTCEPSS rescore
  52. 2026-07-29 15:24 UTCEG score recompute
  53. 2026-07-29 14:49 UTCEG score recompute
  54. 2026-07-28 23:23 UTCEG score recompute
  55. 2026-07-28 22:17 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66063?
CVE-2026-66063 is a medium vulnerability published on July 28, 2026. goshs is a feature-rich single-binary file server for red teamers and developers. Prior to 2.1.5, the httpserver/updown.go multipart upload handler split part.FileName() on / but did not reject .., allowing an unauthenticated upload with filename .. to create a file outside the served tree. This…
When was CVE-2026-66063 disclosed?
CVE-2026-66063 was first published in the National Vulnerability Database on July 28, 2026, with the most recent update on July 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66063 actively exploited?
CVE-2026-66063 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 85.8% of all scored CVEs.
What is the CVSS score of CVE-2026-66063?
CVE-2026-66063 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-66063?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66063, 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.

Dependency Blast Radius

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