Vulnerability details

CVE-2026-34752

haraka Haraka

Haraka affected by DoS via `__proto__` email header

CVSS 4.0

8.7High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.7High	4.0	CVEProject cvelistV5 (CNA) (GitHub_M)	`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`

Affected products

Vendor	Product	Versions	Source
haraka	Haraka	< 3.1.4	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-04-02
Last updated: 2026-04-03
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.43%

Probability of exploitation in 30 days

38.3%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-248
Uncaught Exception