{"id":"CVE-2026-50013","state":"PUBLISHED","title":"Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode","description":"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.","publishedAt":"2026-09-11T21:27:40.296Z","updatedAt":"2026-09-14T18:17:21.942Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-qrh4-p6v4-mrfg","https://github.com/SpectoLabs/hoverfly/pull/1227","https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"],"weaknesses":["CWE-362","CWE-820"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/50xxx/CVE-2026-50013.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-50013","state":"PUBLISHED","datePublished":"2026-09-11T21:27:40.296Z","dateUpdated":"2026-09-14T18:17:21.942Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-02T22:46:02.579Z"},"containers":{"cna":{"title":"Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode","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."}],"affected":[{"vendor":"SpectoLabs","product":"hoverfly","versions":[{"version":"< 1.12.8","status":"affected"}]}],"references":[{"url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-qrh4-p6v4-mrfg","name":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-qrh4-p6v4-mrfg","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/SpectoLabs/hoverfly/pull/1227","name":"https://github.com/SpectoLabs/hoverfly/pull/1227","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":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"}}],"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"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-11T21:27:40.296Z"},"source":{"advisory":"GHSA-qrh4-p6v4-mrfg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-14T17:06:19.894343Z","id":"CVE-2026-50013","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T18:17:21.942Z"}}]}}}