---
id: CVE-2026-34752
title: Haraka is a Node.js mail server
summary: >-
  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.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-248
vendor: haraka_project
product: haraka
affected:
  - haraka < 3.1.4
patched:
  - haraka 3.1.4
published: '2026-04-02'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T22:10:00.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34752'
references:
  - url: 'https://github.com/haraka/Haraka/releases/tag/v3.1.4'
    label: security-advisories@github.com
  - url: 'https://github.com/haraka/Haraka/security/advisories/GHSA-xph3-r2jf-4vp3'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00515
epssPercentile: 0.41923
ingestedAt: '2026-10-06T22:23:15.912Z'
---

## Overview

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.

## Affected

- `haraka < 3.1.4`

## Remediation

Upgrade past the affected range:

- `haraka 3.1.4`