Answer in brief
CVE-2026-50018 records a Medium severity (CVSS 6.5) vulnerability in Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions. The current sources do not mark it as known exploited. The current feed maps SpectoLabs/hoverfly (generic), github.com/SpectoLabs/hoverfly (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps SpectoLabs/hoverfly (generic), github.com/SpectoLabs/hoverfly (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| SpectoLabs/hoverflygeneric | <1.12.8 | 1.12.8 |
| github.com/SpectoLabs/hoverflygo | <=1.12.7 | 1.12.8 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.