# CVE-2026-66063 — goshs-labs goshs

> As of 2026-07-28, CVE-2026-66063 is a MEDIUM-severity vulnerability in goshs-labs goshs, CVSS v3.1 6.5. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-66063 as of 2026-07-28; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-07-28

## What is 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.

The record classifies CVE-2026-66063 under weakness class [CWE-22](https://intel.threadlinqs.com/cwe/CWE-22). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 69 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.5 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-28

## Is CVE-2026-66063 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [goshs-labs](https://intel.threadlinqs.com/vendors/goshs-labs): goshs

## How to fix CVE-2026-66063

No vendor patch reference has been recorded for CVE-2026-66063 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-66063

No threat campaign in the Threadlinqs corpus currently references CVE-2026-66063, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-07-29. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/goshs-labs/goshs/security/advisories/GHSA-wg2q-39h6-66x9)

**Other references**

- [github.com](https://github.com/goshs-labs/goshs/commit/f3ef599e409151d1380866e47de8b1afb0bb54fa)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-66063
Full detection coverage and IOCs for threats exploiting CVE-2026-66063 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp