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CVE-2026-34752

Haraka affected by DoS via `__proto__` email header

HIGH
7.5
CVSS Score
Published: April 2, 2026 at 06:42 PM UTC
Updated: October 6, 2026 at 10:10 PM UTC
1 product affected across 1 vendorHaraka

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Haraka· Haraka Projectnpm
95%
v < 3.1.4
Affected range stops below 3.1.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMExploitVendor Advisory
Source: cverecord
https://github.com/haraka/Haraka/security/advisories/GHSA-xph3-r2jf-4vp3
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/haraka/Haraka/releases/tag/v3.1.4

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-248

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