{"id":"CVE-2026-50018","title":"Hoverfly is an open source API simulation tool","summary":"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 con…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"vendor":"SpectoLabs","product":"hoverfly","affected":["hoverfly < 1.12.8"],"patched":["github.com/SpectoLabs/hoverfly 1.12.8"],"published":"2026-09-11","updated":"2026-09-14","sourceUpdated":"2026-09-14T20:16:44.783","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-50018","references":[{"url":"https://github.com/SpectoLabs/hoverfly/pull/1228","label":"security-advisories@github.com"},{"url":"https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8","label":"security-advisories@github.com"},{"url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","label":"security-advisories@github.com"},{"url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-42j2-w334-qxw7"}],"tags":["nvd","cve.org","exploit-available","ghsa","go"],"epss":0.00299,"epssPercentile":0.22772,"aliases":["GHSA-42j2-w334-qxw7"],"ecosystem":"go","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-14T19:28:24.142551Z"},"ingestedAt":"2026-07-14T18:38:32.931Z","slug":"CVE-2026-50018","body":"## Overview\n\nHoverfly 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-50018)\n\nAffected packages:\n\n- `github.com/SpectoLabs/hoverfly <= 1.12.7`\n\nPatched in:\n\n- `github.com/SpectoLabs/hoverfly 1.12.8`\n\nSource: https://github.com/advisories/GHSA-42j2-w334-qxw7","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":203321,"id":"CVE-2026-50018","ts":1789416908298,"field":"exploit_available","old":"false","new":"true"}]}