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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Haraka
  • Haraka

No data.

No data.

References
Link Providers
https://github.com/haraka/Haraka/releases/tag/v3.1.4 cve-icon cve-icon
https://github.com/haraka/Haraka/security/advisories/GHSA-xph3-r2jf-4vp3 cve-icon cve-icon
History

Fri, 03 Apr 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Haraka
Haraka haraka
Vendors & Products Haraka
Haraka haraka

Thu, 02 Apr 2026 20:30:00 +0000

Type Values Removed Values Added
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.
Title Haraka affected by DoS via `__proto__` email header
Weaknesses CWE-248
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-02T18:42:38.367Z

Updated: 2026-04-02T18:42:38.367Z

Reserved: 2026-03-30T19:17:10.225Z

Link: CVE-2026-34752

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-02T19:21:33.517

Modified: 2026-04-02T19:21:33.517

Link: CVE-2026-34752

cve-icon Redhat

No data.