Vulnerability details
CVE-2026-92598
nodemailer nodemailer
Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list Bypass
CVSS 4.0
8.3High
Official description
Nodemailer before 9.1.0 fails to apply UTS-46 normalization when encoding international domain names, causing the domain resolver to compute a different Punycode A-label than standards-compliant parsers. Attackers can craft recipient addresses with invisible characters or compatibility mappings that pass domain allow-list checks but are delivered to attacker-controlled domains via SMTP.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.3High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N |
| 6.5Medium | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| nodemailer | nodemailer | v < 9.1.0 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://github.com/nodemailer/nodemailer/commit/259c32d patch
- https://github.com/nodemailer/nodemailer/commit/b212ac4 patch
- https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-idn-punycode-domain-allow-list-bypass third-party-advisory
- https://github.com/nodemailer/nodemailer/security/advisories/GHSA-wmmp-3585-3rmp vendor-advisory
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Details
- Published
- 2026-09-17
- Last updated
- 2026-09-17
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.39%
Probability of exploitation in 30 days
33.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-436Interpretation Conflict