# CVE-2026-50018

## Summary

- **CVE ID:** CVE-2026-50018
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
- **CWE:** CWE-400, CWE-770
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

Hoverfly is an open source API simulation tool. Prior to version 1.12.8, remote post-serve actions use `http.DefaultClient` without any timeout configuration. When the remote endpoint is unreachable or intentionally slow (accepts TCP connection but never responds), each triggered proxy request spawns a goroutine that blocks indefinitely on `http.DefaultClient.Do()`. An attacker can cause unbounded goroutine accumulation leading to memory exhaustion and process crash (OOM kill). Unlike local post-serve action execution, this requires no binary execution, only a URL pointing to a non-responsive endpoint. Version 1.12.8 patches the issue.

## Affected Products

- SpectoLabs — hoverfly (< 1.12.8)

## References

- [CNA](https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7)
- [CNA](https://github.com/SpectoLabs/hoverfly/pull/1228)
- [CNA](https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._