{"id":"CVE-2026-50018","aliases":["GHSA-42j2-w334-qxw7","GO-2026-5975"],"url":"https://o3.security/vulnerability/CVE-2026-50018","summary":"Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions","details":"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.","published":"2026-09-11T21:28:29.228Z","modified":"2026-09-16T03:30:39.961063204Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"epss":{"score":0.00299,"percentile":0.22668,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/SpectoLabs/hoverfly","fixedVersion":"1.12.8"}],"fix":{"url":"https://github.com/SpectoLabs/hoverfly/pull/1228","label":"SpectoLabs/hoverfly#1228"},"references":[{"type":"WEB","url":"https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50018.json"},{"type":"ADVISORY","url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50018"},{"type":"FIX","url":"https://github.com/SpectoLabs/hoverfly/pull/1228"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T03:30:39.961063204Z"}}