CVE-2026-34752 HIGH

CVE-2026-34752: Haraka affected by DoS via `proto` email header

Vendor Haraka

Product Haraka

Weakness CWE-248

Published April 2, 2026

Last update April 3, 2026

View on NVD All CVEs

CVSS base score

8.7/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality —

Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 2, 2026 CVE published

April 3, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-34752 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/248.html

Related vulnerabilities

CVE-2026-34752: Haraka affected by DoS via `__proto__` email header

01Description

02Disclosure timeline

03References

04Related CVE

CVE-2026-34752: Haraka affected by DoS via `proto` email header