{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-50013", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-02T22:46:02.579Z", "datePublished": "2026-09-11T21:27:40.296Z", "dateUpdated": "2026-09-11T21:27:40.296Z"}, "containers": {"cna": {"title": "Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode", "problemTypes": [{"descriptions": [{"cweId": "CWE-362", "lang": "en", "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-820", "lang": "en", "description": "CWE-820: Missing Synchronization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-qrh4-p6v4-mrfg", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-qrh4-p6v4-mrfg"}, {"name": "https://github.com/SpectoLabs/hoverfly/pull/1227", "tags": ["x_refsource_MISC"], "url": "https://github.com/SpectoLabs/hoverfly/pull/1227"}, {"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": "2026-09-11T21:27:40.296Z"}, "descriptions": [{"lang": "en", "value": "Hoverfly is an open source API simulation tool. Prior to version 1.12.8, when Hoverfly is running in Diff mode, the `AddDiff()` function writes to the shared `responsesDiff` map without any synchronization (no mutex). When multiple proxy requests are processed concurrently (the normal case for any proxy), the concurrent map writes trigger Go's built-in race detector which causes a `fatal error: concurrent map read and map write`, immediately killing the entire Hoverfly process. This is trivially exploitable by sending multiple simultaneous requests. Version 1.12.8 patches the issue."}], "source": {"advisory": "GHSA-qrh4-p6v4-mrfg", "discovery": "UNKNOWN"}}}}

{}

{"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, when Hoverfly is running in Diff mode, the `AddDiff()` function writes to the shared `responsesDiff` map without any synchronization (no mutex). When multiple proxy requests are processed concurrently (the normal case for any proxy), the concurrent map writes trigger Go's built-in race detector which causes a `fatal error: concurrent map read and map write`, immediately killing the entire Hoverfly process. This is trivially exploitable by sending multiple simultaneous requests. Version 1.12.8 patches the issue."}], "id": "CVE-2026-50013", "lastModified": "2026-09-11T22:16:37.813", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-11T22:16:37.813", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/SpectoLabs/hoverfly/pull/1227"}, {"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-qrh4-p6v4-mrfg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}, {"lang": "en", "value": "CWE-820"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-09-12T06:15:04.244538+00:00", "updated": "2026-09-12T06:15:04.244551+00:00", "vendors": []}