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TI-2026-62452 Aliases CVE-2026-92596GHSA-v554-hhrr-96v5

Nodemailer before 9.1.0 Denial of Service via addressparser

Priority HIGH 77CWE-400Published · 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-400.

Summary

Nodemailer before 9.1.0 contains a quadratic time complexity vulnerability in the addressparser component that allows remote attackers to cause denial of service by supplying a crafted comma-separated address list. Attackers can send a single email with a large number of addresses to block the Node.js event loop for extended periods, consuming 100% CPU and freezing the process.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00824 57th percentileScored 2026-11-07
Fix Fixed nodemailer (nodemailer): 9.1.0

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

VendorProductAffected versionsFixed inStatusSource
nodemailernodemailerbefore 9.1.09.1.0Patch availableCNA
  • nodemailer Vendornodemailer Affected before 9.1.0 Fixed in 9.1.0 Patch available CNA

Remediation

  • Fix · CNA nodemailer (nodemailer) Fixed in 9.1.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    nodemailer 9.1.0

    3 records Highest priority Priority HIGH 2 HIGH, 1 LOW

    Other records, highest priority first

    • TI-2026-62454 Nodemailer before 9.1.0 IDN/Punycode Domain Allow-list BypassPriority HIGH 69
    • TI-2026-62453 Nodemailer before 9.1.0 Email Domain Validation Bypass via RFC 5322 CommentPriority LOW 36
    Show all 3 records →

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

  1. 2026-10-02 Threatist record created from CVE-2026-92596
  2. 2026-10-03 Alias added: GHSA-v554-hhrr-96v5
  3. 2026-10-20 Affected versions changed · Red Hat
  4. 2026-10-21 Affected versions changed · Red Hat
  5. 2026-10-23 Affected versions changed · Red Hat
  6. 2026-10-27 Affected versions changed · Red Hat

References

Patch 4

Advisory 1

  • 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-2026-61683 Nodemailer 9.1.0 through 10.0.4 Denial of Service via Quadratic Address Parsing 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
See all 27 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences