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.
CVE-2026-92596
HIGHPre-NVD 7.57.5—Trending — 4 sources updated this weekElevated
EchelonGraph scoreHIGH confidence
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-17. a secondary CVSS source baseline 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(high)
- EG Risk
- 65(Attend)EG Risk 65/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity75% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 0%
- EPSS %ILE
- 39%
- KEV
- Not listed
Published
September 16, 2026
Last Modified
September 17, 2026
Advisory Details (6)
Auto-updated Sep 16, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic
Nodemailer before 9.1.0 Denial of Service via addressparser | Advisories | VulnCheck
https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparsergithub_commit Patch Available
commit 83b8c48 (nodemailer/nodemailer)
Patch available: nodemailer/nodemailer v9.1.0 (contains commit 83b8c48)
https://github.com/nodemailer/nodemailer/commit/83b8c48github_commit Patch Available
commit 34da642 (nodemailer/nodemailer)
Patch available: nodemailer/nodemailer v9.1.0 (contains commit 34da642)
https://github.com/nodemailer/nodemailer/commit/34da642github_commit Patch Available
commit 7cc38af (nodemailer/nodemailer)
Patch available: nodemailer/nodemailer v9.1.0 (contains commit 7cc38af)
https://github.com/nodemailer/nodemailer/commit/7cc38afgithub_commit Patch Available
commit 9116da9 (nodemailer/nodemailer)
Patch available: nodemailer/nodemailer v9.1.0 (contains commit 9116da9)
https://github.com/nodemailer/nodemailer/commit/9116da9github Patch Available🟡 PoC Available
Quadratic (O(n²)) time complexity in addressparser allows remote denial of service via a crafted address list · Advisory · nodemailer/nodemailer · GitHub
Affected: 9.1.0
https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2Vendor Advisories for CVE-2026-92596(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| nodemailer | — | 9.1.0 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 16× in last 7d / 16× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-09-18 23:39 UTCEG score recompute
- 2026-09-18 23:39 UTCGHSA enrichment
- 2026-09-18 19:28 UTCEPSS rescore
- 2026-09-18 12:34 UTCGHSA enrichment
- 2026-09-18 01:29 UTCEG score recompute
- 2026-09-18 01:29 UTCGHSA enrichment
- 2026-09-17 19:32 UTCEPSS rescore
- 2026-09-17 14:24 UTCEG score recompute
- 2026-09-17 14:24 UTCGHSA enrichment
- 2026-09-17 13:35 UTCEG score recompute
- 2026-09-17 13:35 UTCGHSA enrichment
- 2026-09-17 09:30 UTCEG score recompute
- 2026-09-17 09:30 UTCGHSA enrichment
- 2026-09-16 22:25 UTCEG score recompute
- 2026-09-16 21:54 UTCEG score recompute
- 2026-09-16 21:54 UTCMITRE cvelistV5first tracked
Frequently asked(5)
What is CVE-2026-92596?
CVE-2026-92596 is a high vulnerability published on September 16, 2026. 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…
When was CVE-2026-92596 disclosed?
CVE-2026-92596 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-92596 actively exploited?
CVE-2026-92596 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.3% of all scored CVEs.
What is the CVSS score of CVE-2026-92596?
CVE-2026-92596 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-92596?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-92596, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-92596
Is Your Infrastructure Affected by CVE-2026-92596?
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