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CVE-2026-50013 is a denial-of-service vulnerability in Hoverfly affecting Diff mode. The flaw is caused by unsynchronized concurrent access to a shared responsesDiff map, creating a race condition in which concurrent requests can trigger simultaneous map reads and writes. In Go, this condition can cause a fatal runtime error and terminate the process. An attacker able to send traffic to the proxy port can exploit the issue by generating concurrent requests that exercise Diff mode and reach the vulnerable shared state.
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Cross-references every affected SKU, including bundled OEM variants.
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