CVE-2026-50018

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-50018", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-02T22:46:02.579Z", "datePublished": "2026-09-11T21:28:29.228Z", "dateUpdated": "2026-09-14T19:28:30.918Z"}, "containers": {"cna": {"title": "Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions", "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"}]}], "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"}}], "references": [{"name": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7"}, {"name": "https://github.com/SpectoLabs/hoverfly/pull/1228", "tags": ["x_refsource_MISC"], "url": "https://github.com/SpectoLabs/hoverfly/pull/1228"}, {"name": "https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8", "tags": ["x_refsource_MISC"], "url": "https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"}], "affected": [{"vendor": "SpectoLabs", "product": "hoverfly", "versions": [{"version": "< 1.12.8", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-11T21:28:29.228Z"}, "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."}], "source": {"advisory": "GHSA-42j2-w334-qxw7", "discovery": "UNKNOWN"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-14T19:28:30.918Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-50018", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-14T19:28:24.142551Z"}}}], "references": [{"url": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-14T19:28:04.891Z"}}], "cna": {"title": "Hoverfly: Denial of Service via Goroutine Leak in Remote Post-Serve Actions", "source": {"advisory": "GHSA-42j2-w334-qxw7", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "SpectoLabs", "product": "hoverfly", "versions": [{"status": "affected", "version": "< 1.12.8"}]}], "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"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-400", "description": "CWE-400: Uncontrolled Resource Consumption"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770: Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-11T21:28:29.228Z"}}}, "cveMetadata": {"cveId": "CVE-2026-50018", "state": "PUBLISHED", "dateUpdated": "2026-09-14T19:28:30.918Z", "dateReserved": "2026-06-02T22:46:02.579Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-09-11T21:28:29.228Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "hoverfly", "vendor": "SpectoLabs", "versions": [{"status": "affected", "version": "< 1.12.8"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-50018", "lastModified": "2026-09-30T17:51:56.193", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-50018", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-14T19:28:24.142551Z", "version": "2.0.3"}}]}, "published": "2026-09-11T22:16:37.950", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/SpectoLabs/hoverfly/pull/1228"}, {"source": "security-advisories@github.com", "url": "https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"}, {"source": "security-advisories@github.com", "url": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-42j2-w334-qxw7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.12.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "hoverfly", "source": "cna", "vendor": "SpectoLabs"}, "product": "hoverfly", "vendor": "spectolabs"}], "created": "2026-09-12T12:30:14.591035+00:00", "updated": "2026-09-15T19:45:07.191259+00:00", "vendors": ["spectolabs", "spectolabs$PRODUCT$hoverfly"]}