CVE-2026-34752 PUBLISHED

Haraka affected by DoS via `proto` email header

Assigner: GitHub_M
Reserved: 30.03.2026 Published: 02.04.2026 Updated: 03.04.2026

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

CVSS 4.0

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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	haraka
Product	Haraka
Versions	Version < 3.1.4 is affected

References

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

Problem Types