CVE-2026-50013

Hoverfly (an open-source API simulation/proxy tool by SpectoLabs) is affected by an unsynchronized concurrent map write in its Diff mode . Prior to version 1.12.8 , the AddDiff() function writes to the shared responsesDiff map without a mutex. Because Hoverfly processes proxy requests concurrentl...

CVE-2026-50013 Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode

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,...

GO-2026-5977 Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode in github.com/SpectoLabs/hoverfly

Hoverfly: Process Crash via Concurrent Map Write Race Condition in Diff Mode in github.com/SpectoLabs/hoverfly...

Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)

Summary The screenshot/print proxy /proxy?data=… maintains a package-level assets mapstringMessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and re-entrant CSS-rewriting code path concurrently write to it under the lock. When the...