CVE-2026-34752 - Vulnerability Details - OpenCVE

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.

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.

Exploitation poc

Automatable yes

Technical Impact partial

Vendors	Products
Haraka	Haraka

No data.

No data.

References

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

History

Fri, 03 Apr 2026 16:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

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

MITRE

Status: PUBLISHED

Assigner: GitHub_M

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

Updated: 2026-04-03T15:47:34.494Z

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

Link: CVE-2026-34752

Vulnrichment

Updated: 2026-04-03T15:47:28.929Z

NVD

Status : Awaiting Analysis

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

Modified: 2026-04-03T16:10:23.730

Link: CVE-2026-34752

Redhat

No data.

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