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CVE-2026-34752

HIGH CVSS 4.0: 8.7 EPSS 0.05%
Updated Apr 03, 2026
Haraka_Project
Parameter Value
CVSS 8.7 (HIGH)
Affected Versions before 3.1.4
Fixed In 3.1.4
Type CWE-248 (Uncaught Exception)
Vendor Haraka_Project
Public PoC No

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 Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Haraka_Project Haraka
cpe:2.3:a:haraka_project:haraka:*:*:*:*:*:node.js:*:*
3.1.4