CVE-2026-45712— Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)

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

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screenshot/print proxy (/proxy?data=…) maintains a package-level assets map[string]MessageAssets 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 unsynchronized read coincides with a synchronized write, Go's runtime raises fatal error: concurrent map read and map write — a runtime.throw that is not recoverable by http.Server's handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it. Version 1.30.0 contains a patch.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

使用共享资源的并发执行不恰当同步问题(竞争条件)

Ralph Slooten Mailpit 竞争条件问题漏洞

axllent mailpit是axllent个人开发者开源的一款邮件测试与调试工具。 Ralph Slooten Mailpit 1.30.0之前版本存在安全漏洞，该漏洞源于在未持有assetsMutex的情况下读取包级assets map缓存，与并发写入操作产生竞争条件，可能导致Go运行时发生致命错误，导致Mailpit进程退出，影响SMTP、POP3和HTTP服务。

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