Haraka affected by DoS via `__proto__` email header
Priority HIGH 77CWE-248Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-248.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00439 38th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Haraka (haraka): 3.1.4Haraka (npm): 3.1.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| haraka | Haraka | before 3.1.4 | 3.1.4 | Patch available | CNA |
| — | Haraka (npm) | before 3.1.4 | 3.1.4 | Patch available | GHSA-xph3-r2jf-4vp3 |
- Haraka Vendorharaka Affected before 3.1.4 Fixed in 3.1.4 Patch available CNA
- Haraka (npm) Vendor— Affected before 3.1.4 Fixed in 3.1.4 Patch available GHSA-xph3-r2jf-4vp3
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:haraka_project:haraka:*:*:*:*:*:node.js:*:* | before 3.1.4 | Vulnerable | Haraka Project |
- cpe:2.3:a:haraka_project:haraka:*:*:*:*:*:node.js:*:* Versions before 3.1.4 Vulnerable ·Haraka Project
Remediation
- Fix · CNA Haraka (haraka) Fixed in 3.1.4
- Fix · GHSA-xph3-r2jf-4vp3 Haraka (npm) Fixed in 3.1.4 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-34752
- 2026-10-03 Alias added: GHSA-xph3-r2jf-4vp3
References
More Haraka Project Haraka vulnerabilities
- TI-2016-09357 Haraka version 2.8.8 and earlier comes with a plugin for processing attachments for zip… CVSS 3.0CRITICAL 9.8
Sources
- CVE-2026-34752 · CVE Program
- CVE-2026-34752 · NVD
- FIRST EPSS
- GHSA-xph3-r2jf-4vp3 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences