{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.12.8"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "012811304202ed426959c2e26e7a5d32e4ce8b7e"
            }
          ],
          "repo": "https://github.com/spectolabs/hoverfly",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qrh4-p6v4-mrfg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-362",
      "CWE-820"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50013.json"
  },
  "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.",
  "id": "CVE-2026-50013",
  "modified": "2026-09-16T03:30:21.477815372Z",
  "published": "2026-09-11T21:27:40.296Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SpectoLabs/hoverfly/releases/tag/v1.12.8"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50013.json"
    },
    {
      "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"
    },
    {
      "type": "FIX",
      "url": "https://github.com/SpectoLabs/hoverfly/pull/1227"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode"
}