# CVE-2026-92596 — nodemailer

> As of 2026-09-17, CVE-2026-92596 is a HIGH-severity vulnerability in nodemailer, CVSS v3.1 7.5. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-92596 as of 2026-09-17; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-17

## What is CVE-2026-92596?

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.

The record classifies CVE-2026-92596 under weakness class [CWE-400](https://intel.threadlinqs.com/cwe/CWE-400). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 19 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **CVSS v4.0 base score:** 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-16, last modified 2026-09-17

## Is CVE-2026-92596 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **nodemailer**: nodemailer

## How to fix CVE-2026-92596

No vendor patch reference has been recorded for CVE-2026-92596 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-92596

No threat campaign in the Threadlinqs corpus currently references CVE-2026-92596, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-09-17. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/nodemailer/nodemailer/security/advisories/GHSA-2x7j-588g-ccc2)
- [github.com — patch](https://github.com/nodemailer/nodemailer/commit/9116da9)
- [github.com — patch (7cc38af)](https://github.com/nodemailer/nodemailer/commit/7cc38af)
- [github.com — patch (34da642)](https://github.com/nodemailer/nodemailer/commit/34da642)
- [github.com — patch (83b8c48)](https://github.com/nodemailer/nodemailer/commit/83b8c48)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/nodemailer-before-9.1.0-denial-of-service-via-addressparser)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-92596
Full detection coverage and IOCs for threats exploiting CVE-2026-92596 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp