{"id":"CVE-2026-50013","summary":"Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode","details":"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.","aliases":["GHSA-qrh4-p6v4-mrfg","GO-2026-5977"],"modified":"2026-09-12T11:46:16.569387162Z","published":"2026-09-11T21:27:40.296Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50013.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-362","CWE-820"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50013.json"},{"type":"FIX","url":"https://github.com/SpectoLabs/hoverfly/pull/1227"},{"type":"WEB","url":"https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"},{"type":"ADVISORY","url":"https://github.com/SpectoLabs/hoverfly/security/advisories/GHSA-qrh4-p6v4-mrfg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50013"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/spectolabs/hoverfly","events":[{"introduced":"0"},{"fixed":"012811304202ed426959c2e26e7a5d32e4ce8b7e"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"1.12.8"}]}}],"versions":["v1.12.7","v1.12.6","v1.12.5","v1.12.4","v1.12.3","v1.12.2","v1.12.1","v1.12.0","v1.11.3","v1.11.2","v1.11.1","v1.11.0","v1.10.13","v1.10.12","v1.10.11","v1.10.10","v1.10.9","v1.10.8","v1.10.7","v1.10.6","v1.10.5","v1.10.4","v1.10.3","v1.10.2","v1.10.1","v1.10.0","v1.9.5","v1.9.4","v1.9.3","v1.9.2","v1.9.1","v1.9.0","v1.8.0","v1.7.0","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.7","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.5","v1.1.4","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.1","v1.0.0","v1.0.0-rc.2","v1.0.0-rc.1","v0.17.7","v0.17.6","v0.17.5","v0.17.4","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.16.0","v0.15.1","v0.15.0","v0.14.2","v0.14.1","v0.14.0","v0.13.0","v0.12.3","v0.12.2","v0.12.1","v0.12.0","v0.11.5","v0.11.4","v0.11.3","v0.11.2","v0.11.1","v0.11.0","v0.10.3","v0.10.2","v0.10.1","v0.10.0","v0.9.2","v0.9.1","v0.9.0","v0.8.2","v0.8.1","v0.8.0","v0.7.1","v0.7.0","v0.6.0","v0.5.17","v0.5.16","v0.5.15","v0.5.14","v0.5.13","v0.5.12","v0.5.11","v0.5.10","v0.5.9","v0.5.8","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5","v0.4","v0.3","v0.2","v0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50013.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}