CVE-2026-34752 impacts Haraka, a Node.js mail server, specifically versions prior to 3.1.4. This vulnerability allows a remote attacker to trigger a denial-of-service condition by sending an email with "__proto__:" as a header name, which crashes the Haraka worker process. With a CVSS v3.1 score of 7.5 (High), it is easily exploitable over the network with low complexity, requiring no privileges or user interaction, and primarily affects system availability. Currently, there is no evidence of active exploitation, nor are there public exploit modules available in common frameworks like Metasploit or Nuclei, though it has received minor community discussion. Organizations using affected Haraka versions should upgrade to 3.1.4 or later to mitigate this risk.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.1.4CPE matchmatch criteria | cpe:2.3:a:haraka_project:haraka:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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