Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Axllent | Mailpit | < 1.30.0 |
Related Weaknesses (CWE)
References
- https://github.com/axllent/mailpit/releases/tag/v1.30.0Release Notes
- https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722ExploitVendor Advisory
- https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722ExploitVendor Advisory
FAQ
What is CVE-2026-45712?
CVE-2026-45712 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...
How severe is CVE-2026-45712?
CVE-2026-45712 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45712?
Check the references section above for vendor advisories and patch information. Affected products include: Axllent Mailpit.