What is CVE-2026-66063?

CVE-2026-66063 is a medium-severity vulnerability in Goshs-Labs Goshs, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-07-28.

How severe is CVE-2026-66063?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Path Traversal in Goshs-Labs Goshs

CVE-2026-66063

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.

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.002 (14.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Goshs-labs Goshs — versions < 2.1.5

Weakness classification (CWE)

CWE-22 — Path Traversal

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-66063?: CVE-2026-66063 is a medium-severity vulnerability in Goshs-Labs Goshs, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-07-28.
How severe is CVE-2026-66063?: Medium severity. CVSS v3 base score is 6.5 out of 10.