{"cve":"CVE-2026-50018","nvd":{"published":"2026-09-11T22:16:37.950","modified":"2026-09-30T17:51:56.193","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-400","CWE-770"],"references":["https://github.com/SpectoLabs/hoverfly/pull/1228","https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8","https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-50018","score":0.00543,"percentile":0.45357,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-42j2-w334-qxw7","url":"https://osv.dev/vulnerability/GHSA-42j2-w334-qxw7","summary":"Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions","modified":"2026-07-21T19:19:22.577419949Z","packages":[{"ecosystem":"Go","name":"github.com/SpectoLabs/hoverfly","purl":"pkg:golang/github.com/SpectoLabs/hoverfly","ranges":["<1.12.8"],"fixed":["1.12.8"]}]},{"id":"GO-2026-5975","url":"https://osv.dev/vulnerability/GO-2026-5975","summary":"Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions in github.com/SpectoLabs/hoverfly","modified":"2026-07-21T19:15:34.729266221Z","packages":[{"ecosystem":"Go","name":"github.com/SpectoLabs/hoverfly","purl":"pkg:golang/github.com/SpectoLabs/hoverfly","ranges":["<1.12.8"],"fixed":["1.12.8"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}