Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, and bcc, allowing attackers to cause… (CVE-2026-100702)
Nodemailer versions before 10.0.2 contain a vulnerability where deeply nested arrays in recipient fields (to, cc, bcc) are not properly flattened. This flaw allows attackers to supply a deeply nested JSON recipient array that triggers recursive Array.toString() calls, causing stack exhaustion and terminating the Node.js process.
AI Analysis
Technical Summary
Nodemailer before version 10.0.2 improperly handles deeply nested arrays in recipient fields such as to, cc, and bcc. When an attacker supplies a deeply nested JSON array, the recursive conversion via Array.toString() leads to call stack exhaustion, causing the Node.js process to terminate unexpectedly. This vulnerability is identified as CVE-2026-100702 and is classified under CWE-674 (Improper Control of a Resource Through a Reference to a Resource in Another Sphere).
Potential Impact
The vulnerability results in a denial of service (DoS) condition by exhausting the call stack and terminating the Node.js process. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
A fix is available in Nodemailer version 10.0.2. Users should upgrade to version 10.0.2 or later to remediate this vulnerability. No other mitigation steps are indicated.
Nodemailer before 10.0.2 fails to properly flatten deeply nested arrays in recipient fields such as to, cc, and bcc, allowing attackers to cause… (CVE-2026-100702)
Description
Nodemailer versions before 10.0.2 contain a vulnerability where deeply nested arrays in recipient fields (to, cc, bcc) are not properly flattened. This flaw allows attackers to supply a deeply nested JSON recipient array that triggers recursive Array.toString() calls, causing stack exhaustion and terminating the Node.js process.
CVSS v3.1
Score 5.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Nodemailer before version 10.0.2 improperly handles deeply nested arrays in recipient fields such as to, cc, and bcc. When an attacker supplies a deeply nested JSON array, the recursive conversion via Array.toString() leads to call stack exhaustion, causing the Node.js process to terminate unexpectedly. This vulnerability is identified as CVE-2026-100702 and is classified under CWE-674 (Improper Control of a Resource Through a Reference to a Resource in Another Sphere).
Potential Impact
The vulnerability results in a denial of service (DoS) condition by exhausting the call stack and terminating the Node.js process. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
A fix is available in Nodemailer version 10.0.2. Users should upgrade to version 10.0.2 or later to remediate this vulnerability. No other mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-5hcf-56h7-4fvx
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-100702"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6ab89bd9f7a7c54106942022
Added to database: 09/27/2026, 04:30:17 UTC
Last enriched: 09/27/2026, 04:41:42 UTC
Last updated: 09/28/2026, 02:00:39 UTC
Views: 19
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