{"id":"CVE-2026-50018","state":"PUBLISHED","title":"Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions","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.","publishedAt":"2026-09-11T21:28:29.228Z","updatedAt":"2026-09-14T19:28:30.918Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["SpectoLabs hoverfly"],"affected":[{"vendor":"SpectoLabs","product":"hoverfly","versions":[{"version":"< 1.12.8","status":"affected"}]}],"references":["https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","https://github.com/SpectoLabs/hoverfly/pull/1228","https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"],"weaknesses":["CWE-400","CWE-770"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/50xxx/CVE-2026-50018.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-50018","state":"PUBLISHED","datePublished":"2026-09-11T21:28:29.228Z","dateUpdated":"2026-09-14T19:28:30.918Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-02T22:46:02.579Z"},"containers":{"cna":{"title":"Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions","descriptions":[{"lang":"en","value":"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":[{"vendor":"SpectoLabs","product":"hoverfly","versions":[{"version":"< 1.12.8","status":"affected"}]}],"references":[{"url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","name":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/SpectoLabs/hoverfly/pull/1228","name":"https://github.com/SpectoLabs/hoverfly/pull/1228","tags":["x_refsource_MISC"]},{"url":"https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8","name":"https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-11T21:28:29.228Z"},"source":{"advisory":"GHSA-42j2-w334-qxw7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T19:28:24.142551Z","id":"CVE-2026-50018","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T19:28:30.918Z"}}]}}}