← back
CVE-2026-34752

Haraka affected by DoS via `__proto__` email header

CVSS 8.7 HIGHEPSS 0.4%CWE-248
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.7EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
02 Apr 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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: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
haraka · Haraka

Want to know if your infrastructure is exposed to this?

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