Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing
Priority HIGH 77CWE-407Published · 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. Impact type from CWE-407.
Summary
Nodemailer versions 9.1.0 through 10.0.4 contain a quadratic time complexity vulnerability in the addressparser component when parsing email addresses with RFC 5322 comments. Attackers can craft malicious email headers with comment-separated atoms to consume excessive CPU and block the Node.js event loop for several seconds, causing denial of service.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00684 52nd percentileScored 2026-11-07
Fix Fixed nodemailer (nodemailer): 10.0.5
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 |
|---|---|---|---|---|---|
| nodemailer | nodemailer | 9.1.0 to before 10.0.5 | 10.0.5 | Patch available | CNA |
- nodemailer Vendornodemailer Affected 9.1.0 to before 10.0.5 Fixed in 10.0.5 Patch available CNA
Remediation
- Fix · CNA nodemailer (nodemailer) Fixed in 10.0.5
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Developer Hub 1
- Red Hat Enterprise Linux 10
- Red Hat Hardened Images
- Self-service automation portal 2
Timeline
- 2026-10-02 Threatist record created from CVE-2026-90776
- 2026-10-03 Alias added: GHSA-vm5r-23w9-m8hx
- 2026-10-20 Affected versions changed · Red Hat
- 2026-10-21 Affected versions changed · Red Hat
- 2026-10-23 Affected versions changed · Red Hat
- 2026-10-27 Affected versions changed · Red Hat
References
More nodemailer vulnerabilities
- TI-2026-74559 ReDoS in Nodemailer SMTP AUTH mechanism detection regexes CVSS 4.0HIGH 8.7
- TI-2026-64856 nodemailer before 10.0.6 Denial of Service via addressparser CVSS 4.0HIGH 8.7
- TI-2026-62452 Nodemailer before 9.1.0 Denial of Service via addressparser CVSS 4.0HIGH 8.7
- TI-2025-13566 Nodemailer: nodemailer: denial of service via crafted email address header CVSS 3.1HIGH 7.5
- TI-2026-74560 Nodemailer address parser passes illegal characters to SMTP envelope CVSS 4.0MEDIUM 6.9
- TI-2026-64855 Nodemailer before 10.0.9 Malformed Envelope Recipient via RFC 5322 Comment CVSS 4.0MEDIUM 6.9
Sources
- CVE-2026-90776 · CVE Program
- CVE-2026-90776 · NVD
- FIRST EPSS
- GHSA-vm5r-23w9-m8hx · GitHub Advisory Database · CC BY 4.0
- CVE-2026-90776 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences