CVE-2026-34752

Haraka affected by DoS via `__proto__` email header

State: Published
Severity: 8.7 High
Published: Apr 2, 2026
Updated: Apr 3, 2026
Reserved: Mar 30, 2026

Description

Haraka is a Node.js mail server. Prior to version 3.1.4, sending an email with __proto__: as a header name crashes the Haraka worker process. This issue has been patched in version 3.1.4.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-248 Uncaught Exception

Affected Products

Product	Versions
Harakaharaka	< 3.1.4Affected

References

https://github.com/haraka/Haraka/security/advisories/GHSA-xph3-r2jf-4vp3
https://github.com/haraka/Haraka/releases/tag/v3.1.4

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